| Message ID | 20200614033106.426-1-wu000273@umn.edu (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media: sti: Fix reference count leaks | expand |
Hi Jean-Christophe, I'll take this patch, but while reviewing it I noticed something else: On 14/06/2020 05:31, wu000273@umn.edu wrote: > From: Qiushi Wu <wu000273@umn.edu> > > pm_runtime_get_sync() increments the runtime PM usage counter even > when it returns an error code, causing incorrect ref count if > pm_runtime_put_noidle() is not called in error handling paths. > Thus call pm_runtime_put_noidle() if pm_runtime_get_sync() fails. > > Signed-off-by: Qiushi Wu <wu000273@umn.edu> > --- > drivers/media/platform/sti/hva/hva-hw.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/media/platform/sti/hva/hva-hw.c b/drivers/media/platform/sti/hva/hva-hw.c > index 401aaafa1710..bb13348be083 100644 > --- a/drivers/media/platform/sti/hva/hva-hw.c > +++ b/drivers/media/platform/sti/hva/hva-hw.c > @@ -272,6 +272,7 @@ static unsigned long int hva_hw_get_ip_version(struct hva_dev *hva) > > if (pm_runtime_get_sync(dev) < 0) { > dev_err(dev, "%s failed to get pm_runtime\n", HVA_PREFIX); > + pm_runtime_put_noidle(dev); > mutex_unlock(&hva->protect_mutex); This appears to be a spurious mutex_unlock() since I don't see a corresponding mutex_lock. Jean-Christophe, can you check this and, if I am right, post a patch fixing this? Regards, Hans > return -EFAULT; > } > @@ -553,6 +554,7 @@ void hva_hw_dump_regs(struct hva_dev *hva, struct seq_file *s) > > if (pm_runtime_get_sync(dev) < 0) { > seq_puts(s, "Cannot wake up IP\n"); > + pm_runtime_put_noidle(dev); > mutex_unlock(&hva->protect_mutex); > return; > } >
On Thu, 17 Sept 2020 at 13:45, Hans Verkuil <hverkuil@xs4all.nl> wrote: > > Hi Jean-Christophe, > > I'll take this patch, but while reviewing it I noticed something else: > > On 14/06/2020 05:31, wu000273@umn.edu wrote: > > From: Qiushi Wu <wu000273@umn.edu> > > > > pm_runtime_get_sync() increments the runtime PM usage counter even > > when it returns an error code, causing incorrect ref count if > > pm_runtime_put_noidle() is not called in error handling paths. > > Thus call pm_runtime_put_noidle() if pm_runtime_get_sync() fails. > > > > Signed-off-by: Qiushi Wu <wu000273@umn.edu> > > --- > > drivers/media/platform/sti/hva/hva-hw.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/drivers/media/platform/sti/hva/hva-hw.c b/drivers/media/platform/sti/hva/hva-hw.c > > index 401aaafa1710..bb13348be083 100644 > > --- a/drivers/media/platform/sti/hva/hva-hw.c > > +++ b/drivers/media/platform/sti/hva/hva-hw.c > > @@ -272,6 +272,7 @@ static unsigned long int hva_hw_get_ip_version(struct hva_dev *hva) > > > > if (pm_runtime_get_sync(dev) < 0) { > > dev_err(dev, "%s failed to get pm_runtime\n", HVA_PREFIX); > > + pm_runtime_put_noidle(dev); > > mutex_unlock(&hva->protect_mutex); > > This appears to be a spurious mutex_unlock() since I don't see a corresponding mutex_lock. > > Jean-Christophe, can you check this and, if I am right, post a patch fixing this? Probably patch should be skipped due to uncertain intentions: https://lore.kernel.org/linux-nfs/YH+7ZydHv4+Y1hlx@kroah.com/ Best regards, Krzysztof
diff --git a/drivers/media/platform/sti/hva/hva-hw.c b/drivers/media/platform/sti/hva/hva-hw.c index 401aaafa1710..bb13348be083 100644 --- a/drivers/media/platform/sti/hva/hva-hw.c +++ b/drivers/media/platform/sti/hva/hva-hw.c @@ -272,6 +272,7 @@ static unsigned long int hva_hw_get_ip_version(struct hva_dev *hva) if (pm_runtime_get_sync(dev) < 0) { dev_err(dev, "%s failed to get pm_runtime\n", HVA_PREFIX); + pm_runtime_put_noidle(dev); mutex_unlock(&hva->protect_mutex); return -EFAULT; } @@ -553,6 +554,7 @@ void hva_hw_dump_regs(struct hva_dev *hva, struct seq_file *s) if (pm_runtime_get_sync(dev) < 0) { seq_puts(s, "Cannot wake up IP\n"); + pm_runtime_put_noidle(dev); mutex_unlock(&hva->protect_mutex); return; }