| commit | a3dbff6eecad72333bae656681331aab27adee4d | |
| author | Jia-Ju Bai <baijiaju1990@163.com> | |
| Thu, 1 Jun 2017 07:17:51 +0000 (1 04:17 -0300) | ||
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | |
| Wed, 7 Jun 2017 15:28:50 +0000 (7 12:28 -0300) | ||
| tree | 8d45015d2cc3f36ca0f76e68571e3f831aa132cf | treesnapshot (tar.gz zip) |
| parent | d989dc20c508cd82e2a95ff5d6c4bb091803f1c8 | commitdiff |
[media] cx18: Fix a sleep-in-atomic bug in snd_cx18_pcm_hw_free
The driver may sleep under a spin lock, and the function call path is:
snd_cx18_pcm_hw_free (acquire the lock by spin_lock_irqsave)
vfree --> may sleep
To fix it, the "substream->runtime->dma_area" is passed to a temporary
value, and mark it NULL when holding the lock. The memory is freed by
vfree through the temporary value outside the lock holding.
Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
[hans.verkuil@cisco.com: removed unnecessary 'if (dma_area)']
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
The driver may sleep under a spin lock, and the function call path is:
snd_cx18_pcm_hw_free (acquire the lock by spin_lock_irqsave)
vfree --> may sleep
To fix it, the "substream->runtime->dma_area" is passed to a temporary
value, and mark it NULL when holding the lock. The memory is freed by
vfree through the temporary value outside the lock holding.
Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
[hans.verkuil@cisco.com: removed unnecessary 'if (dma_area)']
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
| drivers/media/pci/cx18/cx18-alsa-pcm.c | diffblobblamehistory |