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[PATCH v3 0/2] drm/drm_crtc: dma_fence_ops fixes

by André Draszik

Hi, These patches fix two issues in the drm/drm_crtc driver. Initially I was hitting the BUG_ON() in a scenario as explained in the commit message of what is now the second patch in this series. After posting, sashiko.dev noticed another issue, that was previously masked by the now-removed BUG_ON(). Since we can't have a loud BUG() be replaced with silent data corruption or worse, I've also added a patch to address this issue highlighted by sashiko.dev. I believe its observation and analysis to be correct. Cheers, Andre' Signed-off-by: André Draszik <andre.draszik(a)linaro.org> --- Changes in v3: - Philipp: - patch 1: update kerneldoc, add Fixes: - patch 2: shorten commit message - explicitly Cc: stable - collect tag - Link to v2: https://lore.kernel.org/r/20260708-linux-drm_crtc_fix2-v2-0-cf72be75d75a@li… Changes in v2: - add new patch 1 to address sashiko observation - original patch 1 becomes patch 2 - patch 2: - don't turn fence_to_crtc() into macro (Jani, Philipp) - update commit message to include reference to deprecated use of BUG - Link to v1: https://lore.kernel.org/r/20260618-linux-drm_crtc_fix2-v1-1-c03e77b36f34@li… --- André Draszik (2): drm/drm_crtc: ensure dma_fence_ops remain valid during device unbind drm/drm_crtc: fix race with dma_fence_signal() in ::get_driver_name() drivers/gpu/drm/drm_crtc.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) --- base-commit: 0718283ab28bc3907e10b61a6b4be6fefa1cbb2f change-id: 20260618-linux-drm_crtc_fix2-23a7c354a412 Best regards, -- André Draszik <andre.draszik(a)linaro.org>

1 week, 2 days

[PATCH V5] i2c: qcom-geni: Add dynamic transfer timeout based on transfer length and frequency

by Aniket Randive

The driver uses a static XFER_TIMEOUT of HZ (1 second) for all transfers regardless of message length or bus frequency, causing unnecessary delays on error paths. Compute the timeout dynamically from message length and bus frequency with a 10x safety margin over the theoretical wire time. Add a 300 ms floor to account for I2C clock stretching and other situations where a slave may keep SCL asserted for an extended period, including faulty devices holding the bus. This replaces the fixed 1-second timeout with a transfer-specific timeout while preserving sufficient margin for software overheads and bus-level delays. For GPI multi-descriptor transfers, use the maximum message length across all queued messages as the per-completion timeout. Signed-off-by: Aniket Randive <aniket.randive(a)oss.qualcomm.com> --- Changes in V5: - Updated the commit message as per the review comments. Changes in V4: - As per konrad suggestion used mult_frac() for bit_usec to avoid intermediate overflow on 32-bit targets. - Updated the commit message and added a driver comment explaining the rationale for the 0.3-second minimum timeout floor value. drivers/i2c/busses/i2c-qcom-geni.c | 47 +++++++++++++++++++++++------- 1 file changed, 37 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 96dbf04138be..f011d2564cd2 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -74,9 +74,14 @@ enum geni_i2c_err_code { #define PACKING_BYTES_PW 4 #define ABORT_TIMEOUT HZ -#define XFER_TIMEOUT HZ #define RST_TIMEOUT HZ +/* 9 bits per byte (8 data + 1 ACK), 10x safety margin */ +#define I2C_TIMEOUT_SAFETY_COEFFICIENT 10 + +/* 300ms floor: budget for clock stretching; slave may hold SCL low indefinitely */ +#define I2C_TIMEOUT_MIN_USEC 300000 + struct geni_i2c_desc { bool no_dma_support; unsigned int tx_fifo_depth; @@ -204,6 +209,16 @@ static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c) return -EINVAL; } +static unsigned long geni_i2c_xfer_timeout(struct geni_i2c_dev *gi2c, size_t len) +{ + size_t bit_cnt = len * 9; + size_t bit_usec = mult_frac(bit_cnt, USEC_PER_SEC, gi2c->clk_freq_out); + size_t xfer_max_usec = (bit_usec * I2C_TIMEOUT_SAFETY_COEFFICIENT) + + I2C_TIMEOUT_MIN_USEC; + + return usecs_to_jiffies(xfer_max_usec); +} + static int qcom_geni_i2c_conf(struct geni_se *se, unsigned long freq) { struct geni_i2c_dev *gi2c = dev_get_drvdata(se->dev); @@ -445,7 +460,7 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, u32 m_param) { dma_addr_t rx_dma = 0; - unsigned long time_left; + unsigned long time_left, timeout; void *dma_buf; struct geni_se *se = &gi2c->se; size_t len = msg->len; @@ -470,8 +485,9 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, gi2c->dma_buf = dma_buf; } + timeout = geni_i2c_xfer_timeout(gi2c, len); cur = gi2c->cur; - time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT); + time_left = wait_for_completion_timeout(&gi2c->done, timeout); if (!time_left) geni_i2c_abort_xfer(gi2c); @@ -484,7 +500,7 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, u32 m_param) { dma_addr_t tx_dma = 0; - unsigned long time_left; + unsigned long time_left, timeout; void *dma_buf; struct geni_se *se = &gi2c->se; size_t len = msg->len; @@ -512,8 +528,9 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, if (!dma_buf) /* Get FIFO IRQ */ writel_relaxed(1, se->base + SE_GENI_TX_WATERMARK_REG); + timeout = geni_i2c_xfer_timeout(gi2c, len); cur = gi2c->cur; - time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT); + time_left = wait_for_completion_timeout(&gi2c->done, timeout); if (!time_left) geni_i2c_abort_xfer(gi2c); @@ -591,7 +608,7 @@ static void geni_i2c_gpi_multi_desc_unmap(struct geni_i2c_dev *gi2c, struct i2c_ * geni_i2c_gpi_multi_xfer_timeout_handler() - Handles multi message transfer timeout * @dev: Pointer to the corresponding dev node * @multi_xfer: Pointer to the geni_i2c_gpi_multi_desc_xfer - * @transfer_timeout_msecs: Timeout value in milliseconds + * @transfer_timeout_msecs: Per-message completion timeout in jiffies * @transfer_comp: Completion object of the transfer * * This function waits for the completion of each processed transfer messages @@ -601,7 +618,7 @@ static void geni_i2c_gpi_multi_desc_unmap(struct geni_i2c_dev *gi2c, struct i2c_ */ static int geni_i2c_gpi_multi_xfer_timeout_handler(struct device *dev, struct geni_i2c_gpi_multi_desc_xfer *multi_xfer, - u32 transfer_timeout_msecs, + unsigned long timeout_jiffies, struct completion *transfer_comp) { int i; @@ -612,7 +629,7 @@ static int geni_i2c_gpi_multi_xfer_timeout_handler(struct device *dev, if (multi_xfer->msg_idx_cnt != multi_xfer->irq_cnt) { time_left = wait_for_completion_timeout(transfer_comp, - transfer_timeout_msecs); + timeout_jiffies); if (!time_left) { dev_err(dev, "%s: Transfer timeout\n", __func__); return -ETIMEDOUT; @@ -736,8 +753,16 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], dma_async_issue_pending(gi2c->tx_c); if ((msg_idx == (gi2c->num_msgs - 1)) || flags & DMA_PREP_INTERRUPT) { + unsigned long timeout; + size_t max_len = 0; + int j; + + for (j = 0; j < gi2c->num_msgs; j++) + max_len = max_t(size_t, max_len, msgs[j].len); + + timeout = geni_i2c_xfer_timeout(gi2c, max_len); ret = geni_i2c_gpi_multi_xfer_timeout_handler(gi2c->se.dev, gi2c_gpi_xfer, - XFER_TIMEOUT, &gi2c->done); + timeout, &gi2c->done); if (ret) { dev_err(gi2c->se.dev, "I2C multi write msg transfer timeout: %d\n", @@ -851,8 +876,10 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i } if (!gi2c->is_tx_multi_desc_xfer) { + unsigned long timeout = geni_i2c_xfer_timeout(gi2c, msgs[i].len); + dma_async_issue_pending(gi2c->tx_c); - time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT); + time_left = wait_for_completion_timeout(&gi2c->done, timeout); if (!time_left) { dev_err(gi2c->se.dev, "%s:I2C timeout\n", __func__); gi2c->err = -ETIMEDOUT; -- 2.34.1

1 week, 2 days

Re: [PATCH net-next v6 3/3] selftests/net: devmem.py: add check_rx_large_niov

by Jakub Kicinski

On Fri, 31 Jul 2026 15:01:01 -0700 Bobby Eshleman wrote: > Meanwhile, do we want drivers/net/hw/config to workaround by carrying > something like SYNC_FILE or DMABUF_HEAPS, or wait and see about the > udmabuf kconfig change? Let's enable SYNC_FILE for now and pursue the UDMABUF change in parallel. It will land in another tree if at all, so we'll have to wait a while before it propagates to us.

1 week, 4 days

Re: [PATCH v5 3/4] drm/prime: use dma_buf_fd_install() to preserve export tracing

by T.J. Mercier

On Wed, Jul 29, 2026 at 11:27 PM Baineng Shou <shoubaineng(a)gmail.com> wrote: > > drm_gem_prime_handle_to_fd() open-codes fd reservation and install > using get_unused_fd_flags() + fd_install() directly. This bypasses > the DMA_BUF_TRACE() call that dma_buf_fd() emits, so observability > tools relying on the trace_dma_buf_fd tracepoint silently miss all > DRM PRIME exports. > > Replace the bare fd_install() with dma_buf_fd_install(), which wraps > fd_install() together with DMA_BUF_TRACE(), restoring full tracepoint > coverage. No functional change; the fd lifecycle (get_unused_fd_flags > → work → install) is already correct. > > Note: this patch depends on dma_buf_fd_install() introduced in > "dma-buf: dma-heap: don't publish fd before copy_to_user() succeeds" > [1]. > > [1] https://lore.kernel.org/dri-devel/20260714114654.3885457-2-shoubaineng@gmai… > > Suggested-by: Christian König <christian.koenig(a)amd.com> > Signed-off-by: Baineng Shou <shoubaineng(a)gmail.com> Reviewed-by: T.J. Mercier <tjmercier(a)google.com> > --- > drivers/gpu/drm/drm_prime.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c > index 9b44c78cd77f..fe3436d1235d 100644 > --- a/drivers/gpu/drm/drm_prime.c > +++ b/drivers/gpu/drm/drm_prime.c > @@ -524,7 +524,7 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev, > return PTR_ERR(dmabuf); > } > > - fd_install(fd, dmabuf->file); > + dma_buf_fd_install(dmabuf, fd); > *prime_fd = fd; > return 0; > } > -- > 2.34.1 >

1 week, 4 days

Re: [PATCH v5 4/4] selftests: dmabuf-heaps: add fd-leak-on-EFAULT regression test

by T.J. Mercier

On Wed, Jul 29, 2026 at 11:27 PM Baineng Shou <shoubaineng(a)gmail.com> wrote: > > Add a test case that verifies no file descriptor is leaked when > DMA_HEAP_IOCTL_ALLOC succeeds internally but copy_to_user() fails > to deliver the fd number back to userspace. > > The failure is triggered by placing the ioctl argument in a private > anonymous page and flipping it to PROT_READ (via mprotect) between > the kernel's copy_from_user() and copy_to_user() calls. With the > buggy kernel the ioctl returns -EFAULT but leaves an extra open fd > in the process's fd table; with the fixed kernel the fd count is > unchanged. > > This serves as a regression test for: > "dma-buf: dma-heap: don't publish fd before copy_to_user() succeeds" > > Suggested-by: Sumit Semwal <sumit.semwal(a)linaro.org> > Signed-off-by: Baineng Shou <shoubaineng(a)gmail.com> > --- > .../selftests/dmabuf-heaps/dmabuf-heap.c | 115 +++++++++++++++++- > 1 file changed, 114 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c > index fc9694fc4e89..bd58e5b06c8b 100644 > --- a/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c > +++ b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c > @@ -390,6 +390,118 @@ static void test_alloc_errors(char *heap_name) > close(heap_fd); > } > > +/* > + * test_alloc_no_fd_leak_on_efault - verify no fd is leaked when > + * copy_to_user() fails during DMA_HEAP_IOCTL_ALLOC. > + * > + * The bug: dma_buf_fd() called fd_install() before copy_to_user(). > + * If copy_to_user() then failed (e.g. via mprotect), the fd was > + * silently installed in the fd table but never returned to userspace. > + * > + * The fix: reserve the fd with get_unused_fd_flags() first, attempt > + * copy_to_user(), and only call fd_install() on success. > + * > + * We trigger the failure by placing the ioctl argument in a page, > + * flipping it to PROT_READ between copy_from_user and copy_to_user, > + * and counting open file descriptors before and after. > + */ > +static void test_alloc_no_fd_leak_on_efault(char *heap_name) > +{ > + int heap_fd = -1; > + int fd_before, fd_after; > + int ret; > + long page_size; > + struct dma_heap_allocation_data *req; > + > + ksft_print_msg("Testing no fd leak when copy_to_user() fails:\n"); > + > + heap_fd = dmabuf_heap_open(heap_name); > + > + page_size = sysconf(_SC_PAGESIZE); > + > + /* > + * Place the ioctl argument in its own private anonymous page so > + * we can flip its protection independently. > + */ > + req = mmap(NULL, page_size, PROT_READ | PROT_WRITE, > + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); > + if (req == MAP_FAILED) { > + ksft_test_result_fail("mmap failed: %s\n", strerror(errno)); > + goto out; > + } > + > + memset(req, 0, sizeof(*req)); > + req->len = page_size; > + req->fd_flags = O_RDWR | O_CLOEXEC; > + > + /* Count open fds before the ioctl */ > + fd_before = 0; > + { > + DIR *d = opendir("/proc/self/fd"); > + struct dirent *de; > + > + if (!d) { > + ksft_test_result_fail("opendir /proc/self/fd: %s\n", > + strerror(errno)); > + munmap(req, page_size); > + goto out; > + } > + while ((de = readdir(d))) > + if (de->d_name[0] != '.') > + fd_before++; > + closedir(d); > + /* subtract the fd opened by opendir itself */ But no actual subtraction? > + } > + > + /* > + * Make the page read-only: copy_from_user() in the kernel will > + * still succeed (it already ran), Huh? copy_from_user hasn't run yet. That happens inside the ioctl(). > but copy_to_user() that writes > + * the fd number back will fault. > + */ > + mprotect(req, page_size, PROT_READ); > + > + ret = ioctl(heap_fd, DMA_HEAP_IOCTL_ALLOC, req); > + > + /* Re-allow writes so munmap can clean up */ > + mprotect(req, page_size, PROT_READ | PROT_WRITE); > + munmap(req, page_size); > + > + if (ret != -1 || errno != EFAULT) { This looks like you meant &&, but I think we should just fail if ret != -1. Either the mprotect is broken, or dma-heap didn't actually try to copy_to_user. > + /* > + * If the ioctl didn't fail with EFAULT, either the kernel > + * handled it differently or mprotect raced. mprotect is synchronous, how could it race with anything here? > Skip rather > + * than giving a false pass/fail. > + */ > + ksft_test_result_skip( > + "ioctl did not return EFAULT (ret=%d errno=%d), skipping\n", > + ret, errno); > + goto out; > + } > + > + /* Count open fds after the failed ioctl */ > + fd_after = 0; > + { > + DIR *d = opendir("/proc/self/fd"); > + struct dirent *de; > + > + if (!d) { > + ksft_test_result_fail("opendir /proc/self/fd: %s\n", > + strerror(errno)); > + goto out; > + } > + while ((de = readdir(d))) > + if (de->d_name[0] != '.') > + fd_after++; > + closedir(d); > + } > + > + ksft_test_result(fd_before == fd_after, > + "no fd leak on EFAULT: before=%d after=%d\n", This is for the failure case, so I don't think the "no" should be in the string. > + fd_before, fd_after); > +out: > + close(heap_fd); > +} > + > static int numer_of_heaps(void) > { > DIR *d = opendir(DEVPATH); > @@ -420,7 +532,7 @@ int main(void) > return KSFT_SKIP; > } > > - ksft_set_plan(11 * numer_of_heaps()); > + ksft_set_plan(12 * numer_of_heaps()); > > while ((dir = readdir(d))) { > if (!strncmp(dir->d_name, ".", 2)) > @@ -435,6 +547,7 @@ int main(void) > test_alloc_zeroed(dir->d_name, ONE_MEG); > test_alloc_compat(dir->d_name); > test_alloc_errors(dir->d_name); > + test_alloc_no_fd_leak_on_efault(dir->d_name); > } > closedir(d); > > -- > 2.34.1 >

1 week, 4 days

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1 week, 5 days

Re: [PATCH net-next v6 3/3] selftests/net: devmem.py: add check_rx_large_niov

by Jakub Kicinski

On Thu, 30 Jul 2026 14:39:37 -0700 Bobby Eshleman wrote: > Poking around, it looks like 231.1.167.0 and above should support > everything, so fw should be okay AFAICT. > > Looks like the config is missing CONFIG_NET_DEVMEM and CONFIG_UDMABUF? Ah, damn, you're right. I grepped for DEVMEM and didn't look closely on a hit. Turns out there's a non-NET DEVMEM, too. Could you send a patch to add the missing config options to tools/testing/selftests/drivers/net/hw/config ? Can be separate or part of this series, doesn't matter. > Sorry, took me a while... was certain it was a bug in my code. > > Not the failure here, but wondering if this was on ARM led to seeing > that 16K hardcoded rx_page_size in run_rx_large_niov() may fail on ARM > with 64K pages because it will fail the IS_ALIGN(16K, 64K) check... Ah, good thought. We've been meaning to get an ARM64 server for NIPA (our current server supplier is out). If it's not too hard could be nice to guard against that. But also not a huge deal for HW tests if they fail instead of skipping.

1 week, 5 days

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1 week, 5 days

Re: [PATCH net-next v6 3/3] selftests/net: devmem.py: add check_rx_large_niov

by Jakub Kicinski

On Fri, 24 Jul 2026 14:21:17 -0700 Bobby Eshleman wrote: > From: Bobby Eshleman <bobbyeshleman(a)meta.com> > > Add a new devmem test case for binding the dmabuf with rx-page-size=16K. > The test sweeps RX payload sizes straddling the niov boundary to cover > the sub-niov, exact-niov, and multi-niov RX paths. > > Silence pylint invalid-name (`with open() as f`) and too-many-arguments > (ncdevmem_rx grew to 6 args) at file scope. > > Signed-off-by: Bobby Eshleman <bobbyeshleman(a)meta.com> > Acked-by: Stanislav Fomichev <sdf(a)fomichev.me> Hm, odd. In NIPA we're getting: TAP version 13 1..1 # timeout set to 0 # selftests: drivers/net/hw: devmem.py # TAP version 13 # 1..5 # ok 1 devmem.check_rx # SKIP marked as disruptive # ok 2 devmem.check_tx # SKIP marked as disruptive # ok 3 devmem.check_tx_chunks # SKIP marked as disruptive # ok 4 devmem.check_rx_hds # SKIP Test requires devmem support # ok 5 devmem.check_rx_large_niov # SKIP Test requires devmem support # # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:5 error:0 ok 1 selftests: drivers/net/hw: devmem.py # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 https://netdev.bots.linux.dev/logs/hwksft/BCM57508/results/755681/config driver: bnxt fw: 237.1.148.0 Any idea?

1 week, 6 days

Re: [PATCH net-next v6 1/3] net: devmem: allow rx-page-size > PAGE_SIZE per dmabuf binding

by Jakub Kicinski

On Fri, 24 Jul 2026 14:21:15 -0700 Bobby Eshleman wrote: > + value: 0 # dummy: codegen needs a number, real value is the PAGE_SIZE macro (header) yamllint says: 12:81 error line too long (89 > 80 characters) (line-length)

1 week, 6 days

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