linaro-kernel August 2013

linaro-kernel@lists.linaro.org

110 participants
185 discussions

[RFC PATCH v6 0/2] Introduce buffer synchronization framework

by Inki Dae

Hi all, This patch set introduces a buffer synchronization framework based on DMA BUF[1] and based on ww-mutexes[2] for lock mechanism, and may be final RFC. The purpose of this framework is to provide not only buffer access control to CPU and CPU, and CPU and DMA, and DMA and DMA but also easy-to-use interfaces for device drivers and user application. In addtion, this patch set suggests a way for enhancing performance. For generic user mode interface, we have used fcntl and select system call[3]. As you know, user application sees a buffer object as a dma-buf file descriptor. So fcntl() call with the file descriptor means to lock some buffer region being managed by the dma-buf object. And select() call means to wait for the completion of CPU or DMA access to the dma-buf without locking. For more detail, you can refer to the dma-buf-sync.txt in Documentation/ There are some cases we should use this buffer synchronization framework. One of which is to primarily enhance GPU rendering performance on Tizen platform in case of 3d app with compositing mode that 3d app draws something in off-screen buffer, and Web app. In case of 3d app with compositing mode which is not a full screen mode, the app calls glFlush to submit 3d commands to GPU driver instead of glFinish for more performance. The reason we call glFlush is that glFinish blocks caller's task until the execution of the 2d commands is completed. Thus, that makes GPU and CPU more idle. As result, 3d rendering performance with glFinish is quite lower than glFlush. However, the use of glFlush has one issue that the a buffer shared with GPU could be broken when CPU accesses the buffer at once after glFlush because CPU cannot be aware of the completion of GPU access to the buffer. Of course, the app can be aware of that time using eglWaitGL but this function is valid only in case of the same process. In case of Tizen, there are some applications that one process draws something in its own off-screen buffer (pixmap buffer) using CPU, and other process gets a off-screen buffer (window buffer) from Xorg using DRI2GetBuffers, and then composites the pixmap buffer with the window buffer using GPU, and finally page flip. Web app based on HTML5 also has the same issue. Web browser and its web app are different process. The web app draws something in its own pixmap buffer, and then the web browser gets a window buffer from Xorg, and then composites the pixmap buffer with the window buffer. And finally, page flip. Thus, in such cases, a shared buffer could be broken as one process draws something in pixmap buffer using CPU, when other process composites the pixmap buffer with window buffer using GPU without any locking mechanism. That is why we need user land locking interface, fcntl system call. And last one is a deferred page flip issue. This issue is that a window buffer rendered can be displayed on screen in about 32ms in worst case: assume that the gpu rendering is completed within 16ms. That can be incurred when compositing a pixmap buffer with a window buffer using GPU and when vsync is just started. At this time, Xorg waits for a vblank event to get a window buffer so 3d rendering will be delayed up to about 16ms. As a result, the window buffer would be displayed in about two vsyncs (about 32ms) and in turn, that would show slow responsiveness. For this, we could enhance the responsiveness with locking mechanism: skipping one vblank wait. I guess in the similar reason, Android, Chrome OS, and other platforms are using their own locking mechanisms; Android sync driver, KDS, and DMA fence. The below shows the deferred page flip issue in worst case, |------------ <- vsync signal |<------ DRI2GetBuffers | | | |------------ <- vsync signal |<------ Request gpu rendering time | | |<------ Request page flip (deferred) |------------ <- vsync signal |<------ Displayed on screen | | | |------------ <- vsync signal Thanks, Inki Dae References: [1] http://lwn.net/Articles/470339/ [2] https://patchwork.kernel.org/patch/2625361/ [3] http://linux.die.net/man/2/fcntl Inki Dae (2): [RFC PATCH v6] dmabuf-sync: Add a buffer synchronization framework [RFC PATCH v2] dma-buf: Add user interfaces for dmabuf sync support. Documentation/dma-buf-sync.txt | 285 +++++++++++++++++ drivers/base/Kconfig | 7 + drivers/base/Makefile | 1 + drivers/base/dma-buf.c | 85 +++++ drivers/base/dmabuf-sync.c | 678 ++++++++++++++++++++++++++++++++++++++++ include/linux/dma-buf.h | 16 + include/linux/dmabuf-sync.h | 191 +++++++++++ 7 files changed, 1263 insertions(+), 0 deletions(-) create mode 100644 Documentation/dma-buf-sync.txt create mode 100644 drivers/base/dmabuf-sync.c create mode 100644 include/linux/dmabuf-sync.h -- 1.7.5.4

12 years

[PATCH 1/3] x86 / ACPI: modify the stale comment for __acpi_map_table()

by Hanjun Guo

The comment for __acpi_map_table() is obvious wrong. In fact, after commit 1c14fa49 (x86: use early_ioremap in __acpi_map_table), the comment became stale, so remove it and add a new one. Signed-off-by: Hanjun Guo <hanjun.guo(a)linaro.org> --- arch/x86/kernel/acpi/boot.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 2627a81..665f857 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -141,16 +141,8 @@ static u32 irq_to_gsi(int irq) } /* - * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END, - * to map the target physical address. The problem is that set_fixmap() - * provides a single page, and it is possible that the page is not - * sufficient. - * By using this area, we can map up to MAX_IO_APICS pages temporarily, - * i.e. until the next __va_range() call. - * - * Important Safety Note: The fixed I/O APIC page numbers are *subtracted* - * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and - * count idx down while incrementing the phys address. + * __acpi_map_table() will be called before the memory allocation + * is ready, so call early_ioremap() to map tables. */ char *__init __acpi_map_table(unsigned long phys, unsigned long size) { -- 1.7.9.5

12 years

[PATCH 0/5] cpufreq: Fixes for 3.12

by Viresh Kumar

Hi Rafael, You recently did this: commit 878f6e074e9a7784a6e351512eace4ccb3542eef Author: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Date: Sun Aug 18 15:35:59 2013 +0200 Revert "cpufreq: Use cpufreq_policy_list for iterating over policies" Revert commit eb60852 (cpufreq: Use cpufreq_policy_list for iterating over policies), because it breaks system suspend/resume on multiple machines. It either causes resume to block indefinitely or causes the BUG_ON() in lock_policy_rwsem_##mode() to trigger on sysfs accesses to cpufreq attributes. ------x------------x--------------- This patchset gets the reverted patch back along with few supporting patches. Cause of the initial problem you observed was this: - At suspend all CPUs are removed leaving boot cpu. At this time policies aren't freed and also aren't removed from cpufreq_policy_list. And per-cpu variable cpufreq_cpu_data is marked as NULL. - At resume CPUs other than boot cpu called __cpufreq_add_dev(). The tricky change that was introduced by my patch was: We iterate over list of policies instead of CPUs, where we used to get policy structure associated with CPUs using per-cpu variable. Which used to be NULL for first CPU of a policy that turned up. For the first cpu we don't want to call cpufreq_add_policy_cpu() but want __cpufreq_add_add() to continue. When we called cpufreq_add_policy_cpu() it tried to stop the governor (which was already stopped) and hence errors leading into unstable state. This patchset fixes these issues and is tested with suspend-resume over my thinkpad with ubuntu. Apart from minor cleanups it removes policy from cpufreq_policy_list in case of suspend/resume as well and hence we will never call cpufreq_add_policy_cpu() for first cpu of a policy. -- viresh Viresh Kumar (5): cpufreq: align closing brace '}' of an if block cpufreq: remove policy from cpufreq_policy_list in system suspend cpufreq: remove unnecessary check in __cpufreq_governor() cpufreq: remove cpufreq_policy_cpu per-cpu variable cpufreq: Use cpufreq_policy_list for iterating over policies drivers/cpufreq/cpufreq.c | 77 +++++++++++++++-------------------------------- 1 file changed, 24 insertions(+), 53 deletions(-) -- 1.7.12.rc2.18.g61b472e

12 years

[PATCH] AArch64: Add single-step and breakpoint handler hooks

by Sandeepa Prabhu

AArch64 Single Steping and Breakpoint debug exceptions will be used by multiple debug framworks like kprobes & kgdb. This patch implements the hooks for those frameworks to register their own handlers for handling breakpoint and single step events. Reworked the debug exception handler in entry.S: do_dbg to pass the correct break/step address to the handlers, i.e. FAR_EL1 if exception is watchpoint, ELR_EL1 for all other debug exceptions. Signed-off-by: Sandeepa Prabhu <sandeepa.prabhu(a)linaro.org> Signed-off-by: Deepak Saxena <dsaxena(a)linaro.org> --- arch/arm64/include/asm/debug-monitors.h | 20 +++++++ arch/arm64/kernel/debug-monitors.c | 102 +++++++++++++++++++++++++++++++- arch/arm64/kernel/entry.S | 6 +- 3 files changed, 124 insertions(+), 4 deletions(-) diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h index a2232d0..aff3a76 100644 --- a/arch/arm64/include/asm/debug-monitors.h +++ b/arch/arm64/include/asm/debug-monitors.h @@ -16,6 +16,8 @@ #ifndef __ASM_DEBUG_MONITORS_H #define __ASM_DEBUG_MONITORS_H +#include <linux/list.h> + #ifdef __KERNEL__ #define DBG_ESR_EVT(x) (((x) >> 27) & 0x7) @@ -62,6 +64,24 @@ struct task_struct; #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ +struct step_hook { + struct list_head node; + int (*fn)(struct pt_regs *regs, unsigned int insn, unsigned long addr); +}; + +void register_step_hook(struct step_hook *hook); +void unregister_step_hook(struct step_hook *hook); + +struct break_hook { + struct list_head node; + u32 esr_magic; + u32 esr_mask; + int (*fn)(struct pt_regs *regs, unsigned int insn, unsigned long addr); +}; + +void register_break_hook(struct break_hook *hook); +void unregister_break_hook(struct break_hook *hook); + u8 debug_monitors_arch(void); void enable_debug_monitors(enum debug_el el); diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index cbfacf7..2846327 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -188,6 +188,54 @@ static void clear_regs_spsr_ss(struct pt_regs *regs) regs->pstate = spsr; } +/* EL1 Single Step Handler hooks */ +static LIST_HEAD(step_hook); +static DEFINE_RAW_SPINLOCK(step_lock); + +void register_step_hook(struct step_hook *hook) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&step_lock, flags); + list_add(&hook->node, &step_hook); + raw_spin_unlock_irqrestore(&step_lock, flags); +} + +void unregister_step_hook(struct step_hook *hook) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&step_lock, flags); + list_del(&hook->node); + raw_spin_unlock_irqrestore(&step_lock, flags); +} + +/* + * Call registered single step handers + * There is no Syndrome info to check for determining the handler. + * So we call all the registered handlers, until the right handler is + * found which returns zero. + */ +static int call_step_hook(struct pt_regs *regs, + unsigned int esr, unsigned long addr) +{ + struct step_hook *hook; + unsigned long flags; + + raw_spin_lock_irqsave(&step_lock, flags); + list_for_each_entry(hook, &step_hook, node) { + raw_spin_unlock_irqrestore(&step_lock, flags); + + if (hook->fn(regs, esr, addr) == 0) + return 0; + + raw_spin_lock_irqsave(&step_lock, flags); + } + raw_spin_unlock_irqrestore(&step_lock, flags); + + return 1; +} + static int single_step_handler(unsigned long addr, unsigned int esr, struct pt_regs *regs) { @@ -215,8 +263,11 @@ static int single_step_handler(unsigned long addr, unsigned int esr, */ user_rewind_single_step(current); } else { - /* TODO: route to KGDB */ - pr_warning("Unexpected kernel single-step exception at EL1\n"); + /* Call single step handlers for kgdb/kprobes */ + if (call_step_hook(regs, addr, esr) == 0) + return 0; + + pr_warn("unexpected single step exception at %lx!\n", addr); /* * Re-enable stepping since we know that we will be * returning to regs. @@ -227,11 +278,56 @@ static int single_step_handler(unsigned long addr, unsigned int esr, return 0; } + +static LIST_HEAD(break_hook); +static DEFINE_RAW_SPINLOCK(break_lock); + +void register_break_hook(struct break_hook *hook) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&break_lock, flags); + list_add(&hook->node, &break_hook); + raw_spin_unlock_irqrestore(&break_lock, flags); +} + +void unregister_break_hook(struct break_hook *hook) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&break_lock, flags); + list_del(&hook->node); + raw_spin_unlock_irqrestore(&break_lock, flags); +} + +static int call_break_hook(struct pt_regs *regs, + unsigned int esr, unsigned long addr) +{ + struct break_hook *hook; + unsigned long flags; + int (*fn)(struct pt_regs *regs, + unsigned int esr, unsigned long addr) = NULL; + + raw_spin_lock_irqsave(&break_lock, flags); + list_for_each_entry(hook, &break_hook, node) + if ((esr & hook->esr_mask) == hook->esr_magic) + fn = hook->fn; + raw_spin_unlock_irqrestore(&break_lock, flags); + + return fn ? fn(regs, esr, addr) : 1; +} + static int brk_handler(unsigned long addr, unsigned int esr, struct pt_regs *regs) { siginfo_t info; + /* Call single step handlers for kgdb/kprobes */ + if (call_break_hook(regs, esr, addr) == 0) + return 0; + + pr_warn("unexpected brk exception at %lx, esr=0x%x\n", addr, esr); + if (!user_mode(regs)) return -EFAULT; @@ -291,7 +387,7 @@ static int __init debug_traps_init(void) hook_debug_fault_code(DBG_ESR_EVT_HWSS, single_step_handler, SIGTRAP, TRAP_HWBKPT, "single-step handler"); hook_debug_fault_code(DBG_ESR_EVT_BRK, brk_handler, SIGTRAP, - TRAP_BRKPT, "ptrace BRK handler"); + TRAP_BRKPT, "AArch64 BRK handler"); return 0; } arch_initcall(debug_traps_init); diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 6ad781b..e7350bd 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -288,8 +288,12 @@ el1_dbg: /* * Debug exception handling */ + mrs x25, far_el1 //far for watchpt + cmp x24, #ESR_EL1_EC_WATCHPT_EL1 + csel x0, x25, x22, eq //addr: x25->far_el1, x22->elr_el1 + b.ge do_dbg tbz x24, #0, el1_inv // EL1 only - mrs x0, far_el1 +do_dbg: mov x2, sp // struct pt_regs bl do_debug_exception -- 1.8.1.2

12 years

[GIT PULL] big.LITTLE MP updates for LSK

by Jon Medhurst (Tixy)

Hi Mark I have some big.LITTLE MP updates for LSK, these are based on your topic v3.10/topic/big.LITTLE. Can you please pull these for this month's LSK release? Thanks Tixy The following changes since commit a0e1bccdf9f1c4d68ea024e4254dbbd1eff96a4a: Merge branches 'master-arm-multi_pmu_v2', 'master-config-fragments', 'master-hw-bkpt-fix', 'master-misc-patches' and 'master-task-placement-v2-updates' into big-LITTLE-MP-master-v19 (2013-07-18 11:49:27 +0100) are available in the git repository at: git://git.linaro.org/arm/big.LITTLE/mp.git master for you to fetch changes up to 18e3c3d2cc1346cb7cc2e3fd777b2c6f4fbb6135: HMP: Update migration timer when we fork-migrate (2013-08-19 15:41:37 +0100) ---------------------------------------------------------------- Chris Redpath (8): HMP: select 'best' task for migration rather than 'current' sched: track per-rq 'last migration time' HMP: Modify the runqueue stats to add a new child stat HMP: Explicitly implement all-load-is-max-load policy for HMP targets sched: HMP change nr_running offload metric HMP: Implement idle pull for HMP HMP: Access runqueue task clocks directly. HMP: Update migration timer when we fork-migrate Morten Rasmussen (1): sched: HMP fix traversing the rb-tree from the curr pointer kernel/sched/fair.c | 373 +++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 330 insertions(+), 43 deletions(-)

12 years

[PATCH V2 00/11] CPUFreq: Fixes & Cleanups for 3.12

by Viresh Kumar

Hi Rafael, This is V2 of the patch series which was posted here earlier: http://www.gossamer-threads.com/lists/linux/kernel/1759514 This patchset tries to fix & cleanup many existing cpufreq core issues. First four patches tries to cleanup basic problems in cpufreq core. Its first patch was earlier sent separately but now is part of this series. Fifth patch was also sent earlier as reply to your patches and was reviewed by Srivatsa. Sixth patch was picked from Lukasz's patchset on introducing software "boost" feature in core. It will be used by this patchset. And 7-10 are are the most significant part of this set. They try to make many things simple and robust. Last patch in the series is new and wasn't part of V1. This is rebased of your bleeding-edge branch + two patches from you: 18a6b03 cpufreq: Avoid double kobject_put() for the same kobject in error code path d0cde63 cpufreq: Do not hold driver module references for additional policy CPUs abe513f Merge branch 'acpi-sleep-next' into linux-next They are also pushed in my cpufreq-next branch. They are tested fairly well on ARM Vexpress TC2 board (big LITTLE). Lukasz Majewski (1): cpufreq: Store cpufreq policies in a list Viresh Kumar (10): cpufreq: Cleanup header files included in core cpufreq: Re-arrange declarations in cpufreq.h cpufreq: Give consistent names for struct cpufreq_policy * cpufreq: Use sizeof(*ptr) form for finding size of a struct cpufreq: Pass policy to cpufreq_add_policy_cpu() cpufreq: Use cpufreq_policy_list for iterating over policies cpufreq: Fix broken usage of governor->owner's refcount cpufreq: Don't use cpufreq_driver->owner's refcount to protect critical sections cpufreq: Remove struct cpufreq_driver's owner field cpufreq: improve error checking on return values of __cpufreq_governor() Documentation/cpu-freq/cpu-drivers.txt | 2 - drivers/cpufreq/acpi-cpufreq.c | 5 +- drivers/cpufreq/at32ap-cpufreq.c | 1 - drivers/cpufreq/blackfin-cpufreq.c | 1 - drivers/cpufreq/cpufreq-nforce2.c | 1 - drivers/cpufreq/cpufreq.c | 426 ++++++++++++++++----------------- drivers/cpufreq/cpufreq_conservative.c | 14 +- drivers/cpufreq/cpufreq_governor.c | 6 - drivers/cpufreq/cpufreq_governor.h | 7 +- drivers/cpufreq/cpufreq_ondemand.c | 24 +- drivers/cpufreq/cpufreq_performance.c | 3 +- drivers/cpufreq/cpufreq_powersave.c | 3 +- drivers/cpufreq/cpufreq_stats.c | 23 +- drivers/cpufreq/cris-artpec3-cpufreq.c | 1 - drivers/cpufreq/cris-etraxfs-cpufreq.c | 1 - drivers/cpufreq/e_powersaver.c | 5 +- drivers/cpufreq/elanfreq.c | 1 - drivers/cpufreq/exynos-cpufreq.c | 2 +- drivers/cpufreq/freq_table.c | 4 +- drivers/cpufreq/gx-suspmod.c | 3 +- drivers/cpufreq/ia64-acpi-cpufreq.c | 5 +- drivers/cpufreq/intel_pstate.c | 1 - drivers/cpufreq/kirkwood-cpufreq.c | 1 - drivers/cpufreq/longhaul.c | 1 - drivers/cpufreq/longrun.c | 1 - drivers/cpufreq/loongson2_cpufreq.c | 1 - drivers/cpufreq/maple-cpufreq.c | 1 - drivers/cpufreq/p4-clockmod.c | 1 - drivers/cpufreq/pasemi-cpufreq.c | 1 - drivers/cpufreq/pcc-cpufreq.c | 1 - drivers/cpufreq/pmac32-cpufreq.c | 1 - drivers/cpufreq/pmac64-cpufreq.c | 6 +- drivers/cpufreq/powernow-k6.c | 1 - drivers/cpufreq/powernow-k7.c | 14 +- drivers/cpufreq/powernow-k8.c | 7 +- drivers/cpufreq/ppc-corenet-cpufreq.c | 1 - drivers/cpufreq/ppc_cbe_cpufreq.c | 1 - drivers/cpufreq/s3c2416-cpufreq.c | 1 - drivers/cpufreq/s3c24xx-cpufreq.c | 6 +- drivers/cpufreq/s3c64xx-cpufreq.c | 1 - drivers/cpufreq/sc520_freq.c | 1 - drivers/cpufreq/sh-cpufreq.c | 1 - drivers/cpufreq/sparc-us2e-cpufreq.c | 6 +- drivers/cpufreq/sparc-us3-cpufreq.c | 6 +- drivers/cpufreq/speedstep-centrino.c | 1 - drivers/cpufreq/speedstep-ich.c | 1 - drivers/cpufreq/speedstep-smi.c | 1 - include/linux/cpufreq.h | 386 ++++++++++++++--------------- 48 files changed, 442 insertions(+), 547 deletions(-) -- 1.7.12.rc2.18.g61b472e

12 years

[PATCH v2 0/1] ARM: signal: sigreturn_codes should be endian neutral to work in BE8

by Victor Kamensky

This is second version of patch that fixes rt_sig* ltp failures in case of big endian V7 kernel. It make sigreturn_codes snippets endian neutral. In this version of the patch problem is fixed by using separate .S file with snippets written with regular asm mnemonic. With such change compiler/linker take care of all needed byteswaps in case of BE8 mode. This approach was suggested on the following thread: http://lists.infradead.org/pipermail/linux-arm-kernel/2013-August/191543.ht… Changes were tested on V7 in both BE and LE modes Changes from v1: Use separate .S file rather than <asm/opcodes.h> instruction byteswaping macros Victor Kamensky (1): ARM: signal: sigreturn_codes should be endian neutral to work in BE8 arch/arm/kernel/Makefile | 3 +- arch/arm/kernel/signal.c | 29 +++--------------- arch/arm/kernel/sigreturn_codes.S | 64 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 70 insertions(+), 26 deletions(-) create mode 100644 arch/arm/kernel/sigreturn_codes.S -- 1.8.1.4

12 years

[PATCH] ASoC: samsung: Rename DMA platform registration functions

by Mark Brown

From: Mark Brown <broonie(a)linaro.org> The current naming with a simple asoc_ prefix is too generic for use in multiplatform kernels. Signed-off-by: Mark Brown <broonie(a)linaro.org> --- sound/soc/samsung/ac97.c | 4 ++-- sound/soc/samsung/dma.c | 8 ++++---- sound/soc/samsung/dma.h | 4 ++-- sound/soc/samsung/i2s.c | 6 +++--- 4 files changed, 11 insertions(+), 11 deletions(-) diff --git a/sound/soc/samsung/ac97.c b/sound/soc/samsung/ac97.c index c732df9..2acf987 100644 --- a/sound/soc/samsung/ac97.c +++ b/sound/soc/samsung/ac97.c @@ -457,7 +457,7 @@ static int s3c_ac97_probe(struct platform_device *pdev) if (ret) goto err5; - ret = asoc_dma_platform_register(&pdev->dev); + ret = samsung_asoc_dma_platform_register(&pdev->dev); if (ret) { dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret); goto err6; @@ -480,7 +480,7 @@ static int s3c_ac97_remove(struct platform_device *pdev) { struct resource *irq_res; - asoc_dma_platform_unregister(&pdev->dev); + samsung_asoc_dma_platform_unregister(&pdev->dev); snd_soc_unregister_component(&pdev->dev); irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); diff --git a/sound/soc/samsung/dma.c b/sound/soc/samsung/dma.c index d54df85..9338d11 100644 --- a/sound/soc/samsung/dma.c +++ b/sound/soc/samsung/dma.c @@ -444,17 +444,17 @@ static struct snd_soc_platform_driver samsung_asoc_platform = { .pcm_free = dma_free_dma_buffers, }; -int asoc_dma_platform_register(struct device *dev) +int samsung_asoc_dma_platform_register(struct device *dev) { return snd_soc_register_platform(dev, &samsung_asoc_platform); } -EXPORT_SYMBOL_GPL(asoc_dma_platform_register); +EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_register); -void asoc_dma_platform_unregister(struct device *dev) +void samsung_asoc_dma_platform_unregister(struct device *dev) { snd_soc_unregister_platform(dev); } -EXPORT_SYMBOL_GPL(asoc_dma_platform_unregister); +EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_unregister); MODULE_AUTHOR("Ben Dooks, <ben(a)simtec.co.uk>"); MODULE_DESCRIPTION("Samsung ASoC DMA Driver"); diff --git a/sound/soc/samsung/dma.h b/sound/soc/samsung/dma.h index 189a7a6..0e86315 100644 --- a/sound/soc/samsung/dma.h +++ b/sound/soc/samsung/dma.h @@ -22,7 +22,7 @@ struct s3c_dma_params { char *ch_name; }; -int asoc_dma_platform_register(struct device *dev); -void asoc_dma_platform_unregister(struct device *dev); +int samsung_asoc_dma_platform_register(struct device *dev); +void samsung_asoc_dma_platform_unregister(struct device *dev); #endif diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c index ce487c2..b302f3b 100644 --- a/sound/soc/samsung/i2s.c +++ b/sound/soc/samsung/i2s.c @@ -1146,7 +1146,7 @@ static int samsung_i2s_probe(struct platform_device *pdev) snd_soc_register_component(&sec_dai->pdev->dev, &samsung_i2s_component, &sec_dai->i2s_dai_drv, 1); - asoc_dma_platform_register(&pdev->dev); + samsung_asoc_dma_platform_register(&pdev->dev); return 0; } @@ -1263,7 +1263,7 @@ static int samsung_i2s_probe(struct platform_device *pdev) pm_runtime_enable(&pdev->dev); - asoc_dma_platform_register(&pdev->dev); + samsung_asoc_dma_platform_register(&pdev->dev); return 0; err: @@ -1293,7 +1293,7 @@ static int samsung_i2s_remove(struct platform_device *pdev) i2s->pri_dai = NULL; i2s->sec_dai = NULL; - asoc_dma_platform_unregister(&pdev->dev); + samsung_asoc_dma_platform_unregister(&pdev->dev); snd_soc_unregister_component(&pdev->dev); return 0; -- 1.8.4.rc3

12 years

[PATCH] ASoC: samsung: Check to see if we managed to allocate a channel

by Mark Brown

From: Mark Brown <broonie(a)linaro.org> Signed-off-by: Mark Brown <broonie(a)linaro.org> --- sound/soc/samsung/dma.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/sound/soc/samsung/dma.c b/sound/soc/samsung/dma.c index 6e2b2b4..d54df85 100644 --- a/sound/soc/samsung/dma.c +++ b/sound/soc/samsung/dma.c @@ -183,6 +183,10 @@ static int dma_hw_params(struct snd_pcm_substream *substream, prtd->params->ch = prtd->params->ops->request( prtd->params->channel, &req, rtd->cpu_dai->dev, prtd->params->ch_name); + if (!prtd->params->ch) { + pr_err("Failed to allocate DMA channel\n"); + return -ENXIO; + } prtd->params->ops->config(prtd->params->ch, &config); } -- 1.8.4.rc3

12 years

[GIT PULL] KVM/ARM Fixes for 3.11

by Christoffer Dall

The following changes since commit e769ece3b129698d2b09811a6f6d304e4eaa8c29: KVM: s390: fix pfmf non-quiescing control handling (2013-07-29 09:02:30 +0200) are available in the git repository at: git://git.linaro.org/people/cdall/linux-kvm-arm.git tags/kvm-arm-fixes-3.11 for you to fetch changes up to 2184a60de26b94bc5a88de3e5a960ef9ff54ba5a: KVM: ARM: Squash len warning (2013-08-11 21:03:39 -0700) ---------------------------------------------------------------- Christoffer Dall (3): ARM: KVM: Fix 64-bit coprocessor handling ARM: KVM: Fix unaligned unmap_range leak KVM: ARM: Squash len warning Marc Zyngier (1): arm64: KVM: fix 2-level page tables unmapping arch/arm/kvm/coproc.c | 26 +++++++++++++++++++------- arch/arm/kvm/coproc.h | 3 +++ arch/arm/kvm/coproc_a15.c | 6 +++++- arch/arm/kvm/mmio.c | 3 ++- arch/arm/kvm/mmu.c | 36 +++++++++++++++--------------------- 5 files changed, 44 insertions(+), 30 deletions(-)

12 years

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linaro-kernel August 2013