Use uninterruptible mutex_lock in the release() file op to make
sure all resources are properly freed when a process is being
terminated. Returning -ERESTARTSYS has no effect for a terminating
process and this caused driver resources not to be released. Not
releasing the buffer queue also prevented other drivers to free
memory, e.g. in MMAP -> USERPTR scenario.
This patch is required for stable kernels v3.6+.
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Kamil Debski <k.debski@xxxxxxxxxxx>
Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
Changes since v1:
- previous patch split in t make it applicable to relevant
stable kernels
drivers/media/platform/s5p-fimc/fimc-capture.c | 3 +--
drivers/media/platform/s5p-fimc/fimc-m2m.c | 3 +--
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/media/platform/s5p-fimc/fimc-capture.c b/drivers/media/platform/s5p-fimc/fimc-capture.c
index 3fc896b..891ee87 100644
--- a/drivers/media/platform/s5p-fimc/fimc-capture.c
+++ b/drivers/media/platform/s5p-fimc/fimc-capture.c
@@ -556,8 +556,7 @@ static int fimc_capture_close(struct file *file)
dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);
- if (mutex_lock_interruptible(&fimc->lock))
- return -ERESTARTSYS;
+ mutex_lock(&fimc->lock);
if (--fimc->vid_cap.refcnt == 0) {
clear_bit(ST_CAPT_BUSY, &fimc->state);
diff --git a/drivers/media/platform/s5p-fimc/fimc-m2m.c b/drivers/media/platform/s5p-fimc/fimc-m2m.c
index 4500e44..62afed3 100644
--- a/drivers/media/platform/s5p-fimc/fimc-m2m.c
+++ b/drivers/media/platform/s5p-fimc/fimc-m2m.c
@@ -718,8 +718,7 @@ static int fimc_m2m_release(struct file *file)
dbg("pid: %d, state: 0x%lx, refcnt= %d",
task_pid_nr(current), fimc->state, fimc->m2m.refcnt);
- if (mutex_lock_interruptible(&fimc->lock))
- return -ERESTARTSYS;
+ mutex_lock(&fimc->lock);
v4l2_m2m_ctx_release(ctx->m2m_ctx);
fimc_ctrls_delete(ctx);
--
1.7.9.5
--
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