Messages in this thread Patch in this message | | | From | Fabian Frederick <> | Subject | [PATCH 4/7 linux-next] saa7146: replace current->state by set_current_state() | Date | Fri, 20 Feb 2015 19:12:54 +0100 |
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Use helper functions to access current->state. Direct assignments are prone to races and therefore buggy.
current->state = TASK_RUNNING can be replaced by __set_current_state()
Thanks to Peter Zijlstra for the exact definition of the problem.
Suggested-By: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Fabian Frederick <fabf@skynet.be> --- drivers/media/common/saa7146/saa7146_vbi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/media/common/saa7146/saa7146_vbi.c b/drivers/media/common/saa7146/saa7146_vbi.c index 1e71e37..2da9957 100644 --- a/drivers/media/common/saa7146/saa7146_vbi.c +++ b/drivers/media/common/saa7146/saa7146_vbi.c @@ -95,7 +95,7 @@ static int vbi_workaround(struct saa7146_dev *dev) /* prepare to wait to be woken up by the irq-handler */ add_wait_queue(&vv->vbi_wq, &wait); - current->state = TASK_INTERRUPTIBLE; + set_current_state(TASK_INTERRUPTIBLE); /* start rps1 to enable workaround */ saa7146_write(dev, RPS_ADDR1, dev->d_rps1.dma_handle); @@ -106,7 +106,7 @@ static int vbi_workaround(struct saa7146_dev *dev) DEB_VBI("brs bug workaround %d/1\n", i); remove_wait_queue(&vv->vbi_wq, &wait); - current->state = TASK_RUNNING; + __set_current_state(TASK_RUNNING); /* disable rps1 irqs */ SAA7146_IER_DISABLE(dev,MASK_28); -- 2.1.0
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