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ALSA: xen: Convert to generic PCM copy ops

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This patch converts the xen frontend driver code to use the new
unified PCM copy callback.  It's a straightforward conversion from
*_user() to *_iter() variants.

Note that copy_from/to_iter() returns the copied bytes, hence the
error condition is adjusted accordingly.

Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Cc: xen-devel@lists.xenproject.org
Link: https://lore.kernel.org/r/20230815190136.8987-16-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-08-15 21:01:26 +02:00
parent 2f432f4702
commit 390244f5ba
1 changed files with 11 additions and 45 deletions
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56
sound/xen/xen_snd_front_alsa.c
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@ -602,38 +602,24 @@ static snd_pcm_uframes_t alsa_pointer(struct snd_pcm_substream *substream)
return (snd_pcm_uframes_t)atomic_read(&stream->hw_ptr);
}
static int alsa_pb_copy_user(struct snd_pcm_substream *substream,
int channel, unsigned long pos, void __user *src,
unsigned long count)
static int alsa_pb_copy(struct snd_pcm_substream *substream,
int channel, unsigned long pos, struct iov_iter *src,
unsigned long count)
{
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
if (unlikely(pos + count > stream->buffer_sz))
return -EINVAL;
if (copy_from_user(stream->buffer + pos, src, count))
if (copy_from_iter(stream->buffer + pos, count, src) != count)
return -EFAULT;
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
}
static int alsa_pb_copy_kernel(struct snd_pcm_substream *substream,
int channel, unsigned long pos, void *src,
unsigned long count)
{
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
if (unlikely(pos + count > stream->buffer_sz))
return -EINVAL;
memcpy(stream->buffer + pos, src, count);
return xen_snd_front_stream_write(&stream->evt_pair->req, pos, count);
}
static int alsa_cap_copy_user(struct snd_pcm_substream *substream,
int channel, unsigned long pos, void __user *dst,
unsigned long count)
static int alsa_cap_copy(struct snd_pcm_substream *substream,
int channel, unsigned long pos, struct iov_iter *dst,
unsigned long count)
{
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
int ret;
@ -645,26 +631,8 @@ static int alsa_cap_copy_user(struct snd_pcm_substream *substream,
if (ret < 0)
return ret;
return copy_to_user(dst, stream->buffer + pos, count) ?
-EFAULT : 0;
}
static int alsa_cap_copy_kernel(struct snd_pcm_substream *substream,
int channel, unsigned long pos, void *dst,
unsigned long count)
{
struct xen_snd_front_pcm_stream_info *stream = stream_get(substream);
int ret;
if (unlikely(pos + count > stream->buffer_sz))
return -EINVAL;
ret = xen_snd_front_stream_read(&stream->evt_pair->req, pos, count);
if (ret < 0)
return ret;
memcpy(dst, stream->buffer + pos, count);
if (copy_to_iter(stream->buffer + pos, count, dst) != count)
return -EFAULT;
return 0;
}
@ -697,8 +665,7 @@ static const struct snd_pcm_ops snd_drv_alsa_playback_ops = {
.prepare = alsa_prepare,
.trigger = alsa_trigger,
.pointer = alsa_pointer,
.copy_user = alsa_pb_copy_user,
.copy_kernel = alsa_pb_copy_kernel,
.copy = alsa_pb_copy,
.fill_silence = alsa_pb_fill_silence,
};
@ -710,8 +677,7 @@ static const struct snd_pcm_ops snd_drv_alsa_capture_ops = {
.prepare = alsa_prepare,
.trigger = alsa_trigger,
.pointer = alsa_pointer,
.copy_user = alsa_cap_copy_user,
.copy_kernel = alsa_cap_copy_kernel,
.copy = alsa_cap_copy,
};
static int new_pcm_instance(struct xen_snd_front_card_info *card_info,