diff options
| author | Joshua Frkuska <joshua_frkuska@mentor.com> | 2018-06-21 18:22:48 +0300 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2018-07-17 10:12:51 +0300 |
| commit | 6b37bd78d30c890e575a1bda22978d1d2a233362 (patch) | |
| tree | fbd87fc72b94aca70809b7043467c106ca2bb0c2 /drivers/usb | |
| parent | dfa042fa310caa475667b8c38d852f14439e0b01 (diff) | |
| download | linux-6b37bd78d30c890e575a1bda22978d1d2a233362.tar.xz | |
usb: gadget: u_audio: update hw_ptr in iso_complete after data copied
In u_audio_iso_complete, the runtime hw_ptr is updated before the
data is actually copied over to/from the buffer/dma area. When
ALSA uses this hw_ptr, the data may not actually be available to
be used. This causes trash/stale audio to play/record. This
patch updates the hw_ptr after the data has been copied to avoid
this.
Fixes: 132fcb460839 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Joshua Frkuska <joshua_frkuska@mentor.com>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/function/u_audio.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c index c0a65e110fc9..4c6df7130891 100644 --- a/drivers/usb/gadget/function/u_audio.c +++ b/drivers/usb/gadget/function/u_audio.c @@ -143,7 +143,6 @@ static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req) update_alsa = true; hw_ptr = prm->hw_ptr; - prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes; spin_unlock_irqrestore(&prm->lock, flags); @@ -168,6 +167,11 @@ static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req) } } + spin_lock_irqsave(&prm->lock, flags); + /* update hw_ptr after data is copied to memory */ + prm->hw_ptr = (hw_ptr + req->actual) % prm->dma_bytes; + spin_unlock_irqrestore(&prm->lock, flags); + exit: if (usb_ep_queue(ep, req, GFP_ATOMIC)) dev_err(uac->card->dev, "%d Error!\n", __LINE__); |