[PATCH AUTOSEL 6.2 1/9] pinctrl: at91: use devm_kasprintf() to avoid potential leaks (part 2)
From: Andy Shevchenko andriy.shevchenko@linux.intel.com
[ Upstream commit f494c1913cbb34b9e2078b7b045c87c1ca6df791 ]
Use devm_kasprintf() instead of kasprintf() to avoid any potential leaks. At the moment drivers have no remove functionality hence there is no need for fixes tag.
While at it, switch to use devm_kasprintf_strarray().
Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Reviewed-by: Claudiu Beznea claudiu.beznea@microchip.com Tested-by: Claudiu Beznea claudiu.beznea@microchip.com Link: https://lore.kernel.org/r/20230215134242.37618-2-andriy.shevchenko@linux.int... Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pinctrl/pinctrl-at91.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c index c405296e49896..2a081b13846e2 100644 --- a/drivers/pinctrl/pinctrl-at91.c +++ b/drivers/pinctrl/pinctrl-at91.c @@ -18,6 +18,7 @@ #include <linux/pm.h> #include <linux/seq_file.h> #include <linux/slab.h> +#include <linux/string_helpers.h>
/* Since we request GPIOs from ourself */ #include <linux/pinctrl/consumer.h> @@ -1364,6 +1365,7 @@ static int at91_pinctrl_probe_dt(struct platform_device *pdev,
static int at91_pinctrl_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; struct at91_pinctrl *info; struct pinctrl_pin_desc *pdesc; int ret, i, j, k, ngpio_chips_enabled = 0; @@ -1404,9 +1406,19 @@ static int at91_pinctrl_probe(struct platform_device *pdev) return -ENOMEM;
for (i = 0, k = 0; i < gpio_banks; i++) { + char **names; + + names = devm_kasprintf_strarray(dev, "pio", MAX_NB_GPIO_PER_BANK); + if (!names) + return -ENOMEM; + for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) { + char *name = names[j]; + + strreplace(name, '-', i + 'A'); + pdesc->number = k; - pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j); + pdesc->name = name; pdesc++; } } @@ -1807,7 +1819,8 @@ static const struct of_device_id at91_gpio_of_match[] = {
static int at91_gpio_probe(struct platform_device *pdev) { - struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; struct at91_gpio_chip *at91_chip = NULL; struct gpio_chip *chip; struct pinctrl_gpio_range *range; @@ -1876,16 +1889,14 @@ static int at91_gpio_probe(struct platform_device *pdev) chip->ngpio = ngpio; }
- names = devm_kcalloc(&pdev->dev, chip->ngpio, sizeof(char *), - GFP_KERNEL); - + names = devm_kasprintf_strarray(dev, "pio", chip->ngpio); if (!names) { ret = -ENOMEM; goto clk_enable_err; }
for (i = 0; i < chip->ngpio; i++) - names[i] = devm_kasprintf(&pdev->dev, GFP_KERNEL, "pio%c%d", alias_idx + 'A', i); + strreplace(names[i], '-', alias_idx + 'A');
chip->names = (const char *const *)names;
From: Eugene Huang eugene.huang99@gmail.com
[ Upstream commit 01b33e284ca28cc977bdcfb23be2c719f2139175 ]
Same DSDT problem as the HP Omen 16-k0005TX, except rt1316 amp is on link2.
Link: https://github.com/thesofproject/linux/issues/4088 Signed-off-by: Eugene Huang eugene.huang99@gmail.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Péter Ujfalusi peter.ujfalusi@linux.intel.com Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com Link: https://lore.kernel.org/r/20230314090618.498716-1-yung-chuan.liao@linux.inte... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soundwire/dmi-quirks.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/soundwire/dmi-quirks.c b/drivers/soundwire/dmi-quirks.c index 7969881f126dc..58ea013fa918a 100644 --- a/drivers/soundwire/dmi-quirks.c +++ b/drivers/soundwire/dmi-quirks.c @@ -73,6 +73,23 @@ static const struct adr_remap hp_omen_16[] = { {} };
+/* + * Intel NUC M15 LAPRC510 and LAPRC710 + */ +static const struct adr_remap intel_rooks_county[] = { + /* rt711-sdca on link0 */ + { + 0x000020025d071100ull, + 0x000030025d071101ull + }, + /* rt1316-sdca on link2 */ + { + 0x000120025d071100ull, + 0x000230025d131601ull + }, + {} +}; + static const struct dmi_system_id adr_remap_quirk_table[] = { /* TGL devices */ { @@ -98,6 +115,14 @@ static const struct dmi_system_id adr_remap_quirk_table[] = { }, .driver_data = (void *)intel_tgl_bios, }, + { + /* quirk used for NUC15 'Rooks County' LAPRC510 and LAPRC710 skews */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Intel(R) Client Systems"), + DMI_MATCH(DMI_PRODUCT_NAME, "LAPRC"), + }, + .driver_data = (void *)intel_rooks_county, + }, { .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
From: Alain Volmat avolmat@me.com
[ Upstream commit e3be4dd2c8d8aabfd2c3127d0e2e5754d3ae82d6 ]
This commit introduces _poll_timeout functions usage instead of wait loops waiting for a status bit.
Signed-off-by: Alain Volmat avolmat@me.com Reviewed-by: Patrice Chotard patrice.chotard@foss.st.com Link: https://lore.kernel.org/r/20230210224309.98452-1-avolmat@me.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/phy/st/phy-miphy28lp.c | 42 ++++++++-------------------------- 1 file changed, 10 insertions(+), 32 deletions(-)
diff --git a/drivers/phy/st/phy-miphy28lp.c b/drivers/phy/st/phy-miphy28lp.c index 068160a34f5cc..e30305b77f0d1 100644 --- a/drivers/phy/st/phy-miphy28lp.c +++ b/drivers/phy/st/phy-miphy28lp.c @@ -9,6 +9,7 @@
#include <linux/platform_device.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> @@ -484,19 +485,11 @@ static inline void miphy28lp_pcie_config_gen(struct miphy28lp_phy *miphy_phy)
static inline int miphy28lp_wait_compensation(struct miphy28lp_phy *miphy_phy) { - unsigned long finish = jiffies + 5 * HZ; u8 val;
/* Waiting for Compensation to complete */ - do { - val = readb_relaxed(miphy_phy->base + MIPHY_COMP_FSM_6); - - if (time_after_eq(jiffies, finish)) - return -EBUSY; - cpu_relax(); - } while (!(val & COMP_DONE)); - - return 0; + return readb_relaxed_poll_timeout(miphy_phy->base + MIPHY_COMP_FSM_6, + val, val & COMP_DONE, 1, 5 * USEC_PER_SEC); }
@@ -805,7 +798,6 @@ static inline void miphy28lp_configure_usb3(struct miphy28lp_phy *miphy_phy)
static inline int miphy_is_ready(struct miphy28lp_phy *miphy_phy) { - unsigned long finish = jiffies + 5 * HZ; u8 mask = HFC_PLL | HFC_RDY; u8 val;
@@ -816,21 +808,14 @@ static inline int miphy_is_ready(struct miphy28lp_phy *miphy_phy) if (miphy_phy->type == PHY_TYPE_SATA) mask |= PHY_RDY;
- do { - val = readb_relaxed(miphy_phy->base + MIPHY_STATUS_1); - if ((val & mask) != mask) - cpu_relax(); - else - return 0; - } while (!time_after_eq(jiffies, finish)); - - return -EBUSY; + return readb_relaxed_poll_timeout(miphy_phy->base + MIPHY_STATUS_1, + val, (val & mask) == mask, 1, + 5 * USEC_PER_SEC); }
static int miphy_osc_is_ready(struct miphy28lp_phy *miphy_phy) { struct miphy28lp_dev *miphy_dev = miphy_phy->phydev; - unsigned long finish = jiffies + 5 * HZ; u32 val;
if (!miphy_phy->osc_rdy) @@ -839,17 +824,10 @@ static int miphy_osc_is_ready(struct miphy28lp_phy *miphy_phy) if (!miphy_phy->syscfg_reg[SYSCFG_STATUS]) return -EINVAL;
- do { - regmap_read(miphy_dev->regmap, - miphy_phy->syscfg_reg[SYSCFG_STATUS], &val); - - if ((val & MIPHY_OSC_RDY) != MIPHY_OSC_RDY) - cpu_relax(); - else - return 0; - } while (!time_after_eq(jiffies, finish)); - - return -EBUSY; + return regmap_read_poll_timeout(miphy_dev->regmap, + miphy_phy->syscfg_reg[SYSCFG_STATUS], + val, val & MIPHY_OSC_RDY, 1, + 5 * USEC_PER_SEC); }
static int miphy28lp_get_resource_byname(struct device_node *child,
From: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org
[ Upstream commit 2367e0ecb498764e95cfda691ff0828f7d25f9a4 ]
There are two issues related to the number of ports coming from Devicetree when exceeding in total QCOM_SDW_MAX_PORTS. Both lead to incorrect memory accesses: 1. With DTS having too big value of input or output ports, the driver, when copying port parameters from local/stack arrays into 'pconfig' array in 'struct qcom_swrm_ctrl', will iterate over their sizes.
2. If DTS also has too many parameters for these ports (e.g. qcom,ports-sinterval-low), the driver will overflow buffers on the stack when reading these properties from DTS.
Add a sanity check so incorrect DTS will not cause kernel memory corruption.
Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org Reviewed-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Reviewed-by: Konrad Dybcio konrad.dybcio@linaro.org Link: https://lore.kernel.org/r/20230222144412.237832-2-krzysztof.kozlowski@linaro... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soundwire/qcom.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index 3354248702900..3e80a4d388cbb 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -1217,6 +1217,9 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl) ctrl->num_dout_ports = val;
nports = ctrl->num_dout_ports + ctrl->num_din_ports; + if (nports > QCOM_SDW_MAX_PORTS) + return -EINVAL; + /* Valid port numbers are from 1-14, so mask out port 0 explicitly */ set_bit(0, &ctrl->dout_port_mask); set_bit(0, &ctrl->din_port_mask);
From: Richard Fitzgerald rf@opensource.cirrus.com
[ Upstream commit e9537962519e88969f5f69cd0571eb4f6984403c ]
This reverts commit 443a98e649b4 ("soundwire: bus: use pm_runtime_resume_and_get()")
Change calls to pm_runtime_resume_and_get() back to pm_runtime_get_sync(). This fixes a usage count underrun caused by doing a pm_runtime_put() even though pm_runtime_resume_and_get() returned an error.
The three affected functions ignore -EACCES error from trying to get pm_runtime, and carry on, including a put at the end of the function. But pm_runtime_resume_and_get() does not increment the usage count if it returns an error. So in the -EACCES case you must not call pm_runtime_put().
The documentation for pm_runtime_get_sync() says: "Consider using pm_runtime_resume_and_get() ... as this is likely to result in cleaner code."
In this case I don't think it results in cleaner code because the pm_runtime_put() at the end of the function would have to be conditional on the return value from pm_runtime_resume_and_get() at the top of the function.
pm_runtime_get_sync() doesn't have this problem because it always increments the count, so always needs a put. The code can just flow through and do the pm_runtime_put() unconditionally.
Signed-off-by: Richard Fitzgerald rf@opensource.cirrus.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Link: https://lore.kernel.org/r/20230406134640.8582-1-rf@opensource.cirrus.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soundwire/bus.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 76515c33e639e..4fd221d0cc818 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -571,9 +571,11 @@ int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) { int ret;
- ret = pm_runtime_resume_and_get(&slave->dev); - if (ret < 0 && ret != -EACCES) + ret = pm_runtime_get_sync(&slave->dev); + if (ret < 0 && ret != -EACCES) { + pm_runtime_put_noidle(&slave->dev); return ret; + }
ret = sdw_nread_no_pm(slave, addr, count, val);
@@ -595,9 +597,11 @@ int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val) { int ret;
- ret = pm_runtime_resume_and_get(&slave->dev); - if (ret < 0 && ret != -EACCES) + ret = pm_runtime_get_sync(&slave->dev); + if (ret < 0 && ret != -EACCES) { + pm_runtime_put_noidle(&slave->dev); return ret; + }
ret = sdw_nwrite_no_pm(slave, addr, count, val);
@@ -1565,9 +1569,10 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave)
sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
- ret = pm_runtime_resume_and_get(&slave->dev); + ret = pm_runtime_get_sync(&slave->dev); if (ret < 0 && ret != -EACCES) { dev_err(&slave->dev, "Failed to resume device: %d\n", ret); + pm_runtime_put_noidle(&slave->dev); return ret; }
From: Hans de Goede hdegoede@redhat.com
[ Upstream commit ded99b89d25fd73a1d7bd910378e0339fd9d4c4a ]
The Android Lenovo Yoga Book X90F / X90L uses the same charger / fuelgauge setup as the already supported Windows Lenovo Yoga Book X91F/L, add a DMI match for this to intel_cht_wc_models with driver_data set to INTEL_CHT_WC_LENOVO_YOGABOOK1.
When the quirk for the X91F/L was initially added it was written to also apply to the X90F/L but this does not work because the Android version of the Yoga Book uses completely different DMI strings. Also adjust the X91F/L quirk to reflect that it only applies to the X91F/L models.
Signed-off-by: Hans de Goede hdegoede@redhat.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Signed-off-by: Lee Jones lee@kernel.org Link: https://lore.kernel.org/r/20230301095402.28582-1-hdegoede@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mfd/intel_soc_pmic_chtwc.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/mfd/intel_soc_pmic_chtwc.c b/drivers/mfd/intel_soc_pmic_chtwc.c index 9216f0d34206c..a82b7cb661b7b 100644 --- a/drivers/mfd/intel_soc_pmic_chtwc.c +++ b/drivers/mfd/intel_soc_pmic_chtwc.c @@ -159,11 +159,19 @@ static const struct dmi_system_id cht_wc_model_dmi_ids[] = { DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"), }, }, { - /* Lenovo Yoga Book X90F / X91F / X91L */ + /* Lenovo Yoga Book X90F / X90L */ .driver_data = (void *)(long)INTEL_CHT_WC_LENOVO_YOGABOOK1, .matches = { - /* Non exact match to match all versions */ - DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9"), + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"), + DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"), + }, + }, { + /* Lenovo Yoga Book X91F / X91L */ + .driver_data = (void *)(long)INTEL_CHT_WC_LENOVO_YOGABOOK1, + .matches = { + /* Non exact match to match F + L versions */ + DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X91"), }, }, { }
From: Qiang Ning qning0106@126.com
[ Upstream commit 96da8f148396329ba769246cb8ceaa35f1ddfc48 ]
When dln2_setup_rx_urbs() in dln2_probe() fails, error out_free forgets to call usb_put_dev() to decrease the refcount of dln2->usb_dev.
Fix this by adding usb_put_dev() in the error handling code of dln2_probe().
Signed-off-by: Qiang Ning qning0106@126.com Signed-off-by: Lee Jones lee@kernel.org Link: https://lore.kernel.org/r/20230330024353.4503-1-qning0106@126.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mfd/dln2.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c index 6cd0b0c752d6e..c3149729cec2e 100644 --- a/drivers/mfd/dln2.c +++ b/drivers/mfd/dln2.c @@ -827,6 +827,7 @@ static int dln2_probe(struct usb_interface *interface, dln2_stop_rx_urbs(dln2);
out_free: + usb_put_dev(dln2->usb_dev); dln2_free(dln2);
return ret;
From: Jarkko Nikula jarkko.nikula@linux.intel.com
[ Upstream commit 72d4a1683741ee578da0e265886e6a7f3d42266c ]
Add Intel Meteor Lake PCH-S also called as Meteor Point-S LPSS PCI IDs.
Signed-off-by: Jarkko Nikula jarkko.nikula@linux.intel.com Acked-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Signed-off-by: Lee Jones lee@kernel.org Link: https://lore.kernel.org/r/20230330132618.4108665-1-jarkko.nikula@linux.intel... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mfd/intel-lpss-pci.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c index dde31c50a6320..699f44ffff0e4 100644 --- a/drivers/mfd/intel-lpss-pci.c +++ b/drivers/mfd/intel-lpss-pci.c @@ -447,6 +447,21 @@ static const struct pci_device_id intel_lpss_pci_ids[] = { { PCI_VDEVICE(INTEL, 0x7e79), (kernel_ulong_t)&bxt_i2c_info }, { PCI_VDEVICE(INTEL, 0x7e7a), (kernel_ulong_t)&bxt_i2c_info }, { PCI_VDEVICE(INTEL, 0x7e7b), (kernel_ulong_t)&bxt_i2c_info }, + /* MTP-S */ + { PCI_VDEVICE(INTEL, 0x7f28), (kernel_ulong_t)&bxt_uart_info }, + { PCI_VDEVICE(INTEL, 0x7f29), (kernel_ulong_t)&bxt_uart_info }, + { PCI_VDEVICE(INTEL, 0x7f2a), (kernel_ulong_t)&tgl_info }, + { PCI_VDEVICE(INTEL, 0x7f2b), (kernel_ulong_t)&tgl_info }, + { PCI_VDEVICE(INTEL, 0x7f4c), (kernel_ulong_t)&bxt_i2c_info }, + { PCI_VDEVICE(INTEL, 0x7f4d), (kernel_ulong_t)&bxt_i2c_info }, + { PCI_VDEVICE(INTEL, 0x7f4e), (kernel_ulong_t)&bxt_i2c_info }, + { PCI_VDEVICE(INTEL, 0x7f4f), (kernel_ulong_t)&bxt_i2c_info }, + { PCI_VDEVICE(INTEL, 0x7f5c), (kernel_ulong_t)&bxt_uart_info }, + { PCI_VDEVICE(INTEL, 0x7f5d), (kernel_ulong_t)&bxt_uart_info }, + { PCI_VDEVICE(INTEL, 0x7f5e), (kernel_ulong_t)&tgl_info }, + { PCI_VDEVICE(INTEL, 0x7f5f), (kernel_ulong_t)&tgl_info }, + { PCI_VDEVICE(INTEL, 0x7f7a), (kernel_ulong_t)&bxt_i2c_info }, + { PCI_VDEVICE(INTEL, 0x7f7b), (kernel_ulong_t)&bxt_i2c_info }, /* LKF */ { PCI_VDEVICE(INTEL, 0x98a8), (kernel_ulong_t)&bxt_uart_info }, { PCI_VDEVICE(INTEL, 0x98a9), (kernel_ulong_t)&bxt_uart_info },
From: "Guilherme G. Piccoli" gpiccoli@igalia.com
[ Upstream commit 829632dae8321787525ee37dc4828bbe6edafdae ]
The panic notifiers' callbacks execute in an atomic context, with interrupts/preemption disabled, and all CPUs not running the panic function are off, so it's very dangerous to wait on a regular spinlock, there's a risk of deadlock.
Refactor the panic notifier of parisc/power driver to make use of spin_trylock - for that, we've added a second version of the soft-power function. Also, some comments were reorganized and trailing white spaces, useless header inclusion and blank lines were removed.
Cc: "James E.J. Bottomley" James.Bottomley@HansenPartnership.com Cc: Jeroen Roovers jer@xs4all.nl Acked-by: Helge Deller deller@gmx.de # parisc Signed-off-by: Guilherme G. Piccoli gpiccoli@igalia.com Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Sasha Levin sashal@kernel.org --- arch/parisc/include/asm/pdc.h | 1 + arch/parisc/kernel/firmware.c | 27 +++++++++++++++++++++++---- drivers/parisc/power.c | 16 ++++++++++------ 3 files changed, 34 insertions(+), 10 deletions(-)
diff --git a/arch/parisc/include/asm/pdc.h b/arch/parisc/include/asm/pdc.h index 40793bef8429f..2b4fad8328e85 100644 --- a/arch/parisc/include/asm/pdc.h +++ b/arch/parisc/include/asm/pdc.h @@ -80,6 +80,7 @@ int pdc_do_firm_test_reset(unsigned long ftc_bitmap); int pdc_do_reset(void); int pdc_soft_power_info(unsigned long *power_reg); int pdc_soft_power_button(int sw_control); +int pdc_soft_power_button_panic(int sw_control); void pdc_io_reset(void); void pdc_io_reset_devices(void); int pdc_iodc_getc(void); diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c index 6817892a2c585..cc124d9f1f7f7 100644 --- a/arch/parisc/kernel/firmware.c +++ b/arch/parisc/kernel/firmware.c @@ -1232,15 +1232,18 @@ int __init pdc_soft_power_info(unsigned long *power_reg) }
/* - * pdc_soft_power_button - Control the soft power button behaviour - * @sw_control: 0 for hardware control, 1 for software control + * pdc_soft_power_button{_panic} - Control the soft power button behaviour + * @sw_control: 0 for hardware control, 1 for software control * * * This PDC function places the soft power button under software or * hardware control. - * Under software control the OS may control to when to allow to shut - * down the system. Under hardware control pressing the power button + * Under software control the OS may control to when to allow to shut + * down the system. Under hardware control pressing the power button * powers off the system immediately. + * + * The _panic version relies on spin_trylock to prevent deadlock + * on panic path. */ int pdc_soft_power_button(int sw_control) { @@ -1254,6 +1257,22 @@ int pdc_soft_power_button(int sw_control) return retval; }
+int pdc_soft_power_button_panic(int sw_control) +{ + int retval; + unsigned long flags; + + if (!spin_trylock_irqsave(&pdc_lock, flags)) { + pr_emerg("Couldn't enable soft power button\n"); + return -EBUSY; /* ignored by the panic notifier */ + } + + retval = mem_pdc_call(PDC_SOFT_POWER, PDC_SOFT_POWER_ENABLE, __pa(pdc_result), sw_control); + spin_unlock_irqrestore(&pdc_lock, flags); + + return retval; +} + /* * pdc_io_reset - Hack to avoid overlapping range registers of Bridges devices. * Primarily a problem on T600 (which parisc-linux doesn't support) but diff --git a/drivers/parisc/power.c b/drivers/parisc/power.c index 456776bd8ee66..6f5e5f0230d39 100644 --- a/drivers/parisc/power.c +++ b/drivers/parisc/power.c @@ -37,7 +37,6 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> -#include <linux/notifier.h> #include <linux/panic_notifier.h> #include <linux/reboot.h> #include <linux/sched/signal.h> @@ -175,16 +174,21 @@ static void powerfail_interrupt(int code, void *x)
-/* parisc_panic_event() is called by the panic handler. - * As soon as a panic occurs, our tasklets above will not be - * executed any longer. This function then re-enables the - * soft-power switch and allows the user to switch off the system +/* + * parisc_panic_event() is called by the panic handler. + * + * As soon as a panic occurs, our tasklets above will not + * be executed any longer. This function then re-enables + * the soft-power switch and allows the user to switch off + * the system. We rely in pdc_soft_power_button_panic() + * since this version spin_trylocks (instead of regular + * spinlock), preventing deadlocks on panic path. */ static int parisc_panic_event(struct notifier_block *this, unsigned long event, void *ptr) { /* re-enable the soft-power switch */ - pdc_soft_power_button(0); + pdc_soft_power_button_panic(0); return NOTIFY_DONE; }
linux-stable-mirror@lists.linaro.org
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Sasha Levin