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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2018-07-10 18:18:33 +0200
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2018-08-02 20:17:15 +0200
commit320905baa1dbddd3991c287432176d536e1d5b79 (patch)
tree7855c0f59a92d5f85909e1f7dfbc0e08acdc867e /drivers/media/usb/usbtv
parentmedia: go7007: use irqsave() in USB's complete callback (diff)
downloadlinux-320905baa1dbddd3991c287432176d536e1d5b79.tar.xz
linux-320905baa1dbddd3991c287432176d536e1d5b79.zip
media: usbtv: use irqsave() in USB's complete callback
The USB completion callback does not disable interrupts while acquiring the lock. We want to remove the local_irq_disable() invocation from __usb_hcd_giveback_urb() and therefore it is required for the callback handler to disable the interrupts while acquiring the lock. The callback may be invoked either in IRQ or BH context depending on the USB host controller. Use the _irqsave() variant of the locking primitives. Cc: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/usb/usbtv')
-rw-r--r--drivers/media/usb/usbtv/usbtv-audio.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/media/usb/usbtv/usbtv-audio.c b/drivers/media/usb/usbtv/usbtv-audio.c
index 2c2ca77fa01f..4ce38246ed64 100644
--- a/drivers/media/usb/usbtv/usbtv-audio.c
+++ b/drivers/media/usb/usbtv/usbtv-audio.c
@@ -126,6 +126,7 @@ static void usbtv_audio_urb_received(struct urb *urb)
struct snd_pcm_runtime *runtime = substream->runtime;
size_t i, frame_bytes, chunk_length, buffer_pos, period_pos;
int period_elapsed;
+ unsigned long flags;
void *urb_current;
switch (urb->status) {
@@ -179,12 +180,12 @@ static void usbtv_audio_urb_received(struct urb *urb)
}
}
- snd_pcm_stream_lock(substream);
+ snd_pcm_stream_lock_irqsave(substream, flags);
chip->snd_buffer_pos = buffer_pos;
chip->snd_period_pos = period_pos;
- snd_pcm_stream_unlock(substream);
+ snd_pcm_stream_unlock_irqrestore(substream, flags);
if (period_elapsed)
snd_pcm_period_elapsed(substream);