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| author | Maxim Mikityanskiy <maxtram95@gmail.com> | 2021-02-06 01:51:39 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-03-11 13:40:28 +0300 |
| commit | 8a7e27fd5cd696ba564a3f62cedef7269cfd0723 (patch) | |
| tree | 342ad489b0a35d0957410ccad3ccbe49923a12d2 /net | |
| parent | f09f9f93afad770a04b35235a0aa465fcc8d6e3d (diff) | |
| download | linux-8a7e27fd5cd696ba564a3f62cedef7269cfd0723.tar.xz | |
media: usbtv: Fix deadlock on suspend
usbtv doesn't support power management, so on system suspend the
.disconnect callback of the driver is called. The teardown sequence
includes a call to snd_card_free. Its implementation waits until the
refcount of the sound card device drops to zero, however, if its file is
open, snd_card_file_add takes a reference, which can't be dropped during
the suspend, because the userspace processes are already frozen at this
point. snd_card_free waits for completion forever, leading to a hang on
suspend.
This commit fixes this deadlock condition by replacing snd_card_free
with snd_card_free_when_closed, that doesn't wait until all references
are released, allowing suspend to progress.
Fixes: 63ddf68de52e ("[media] usbtv: add audio support")
Signed-off-by: Maxim Mikityanskiy <maxtram95@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions