Now that snd_pcm_sync_ptr_get_user() and snd_pcm_sync_ptr_put_user()
are converted to user_access_begin/user_access_end(),
snd_pcm_sync_ptr_get_user() is more efficient than a raw get_user()
followed by a copy_from_user(). And because copy_{to/from}_user() are
generic functions focussed on transfer of big data blocks to/from user,
snd_pcm_sync_ptr_put_user() is also more efficient for small amont of
data.
So use snd_pcm_sync_ptr_get_user() and snd_pcm_sync_ptr_put_user() in
snd_pcm_sync_ptr() too.
snd_pcm_ioctl_sync_ptr_buggy() is left as it is because the conversion
wouldn't be straigh-forward due to the workaround it provides.
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
sound/core/pcm_native.c | 38 ++++++++++++++++++--------------------
1 file changed, 18 insertions(+), 20 deletions(-)
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index b7339c9ebb1f..1eab940fa2e5 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3096,45 +3096,43 @@ static int snd_pcm_sync_ptr(struct snd_pcm_substream
*substream,
struct snd_pcm_sync_ptr __user *_sync_ptr)
{
struct snd_pcm_runtime *runtime = substream->runtime;
- struct snd_pcm_sync_ptr sync_ptr;
volatile struct snd_pcm_mmap_status *status;
volatile struct snd_pcm_mmap_control *control;
+ u32 sflags;
+ struct snd_pcm_mmap_control scontrol;
+ struct snd_pcm_mmap_status sstatus;
int err;
- memset(&sync_ptr, 0, sizeof(sync_ptr));
- if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
+ if (snd_pcm_sync_ptr_get_user(sflags, scontrol, _sync_ptr))
return -EFAULT;
- if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control),
sizeof(struct snd_pcm_mmap_control)))
- return -EFAULT;
status = runtime->status;
control = runtime->control;
- if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
+ if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
err = snd_pcm_hwsync(substream);
if (err < 0)
return err;
}
scoped_guard(pcm_stream_lock_irq, substream) {
- if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
- err = pcm_lib_apply_appl_ptr(substream,
-
sync_ptr.c.control.appl_ptr);
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
+ err = pcm_lib_apply_appl_ptr(substream,
scontrol.appl_ptr);
if (err < 0)
return err;
} else {
- sync_ptr.c.control.appl_ptr = control->appl_ptr;
+ scontrol.appl_ptr = control->appl_ptr;
}
- if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
- control->avail_min = sync_ptr.c.control.avail_min;
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
+ control->avail_min = scontrol.avail_min;
else
- sync_ptr.c.control.avail_min = control->avail_min;
- sync_ptr.s.status.state = status->state;
- sync_ptr.s.status.hw_ptr = status->hw_ptr;
- sync_ptr.s.status.tstamp = status->tstamp;
- sync_ptr.s.status.suspended_state = status->suspended_state;
- sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
+ scontrol.avail_min = control->avail_min;
+ sstatus.state = status->state;
+ sstatus.hw_ptr = status->hw_ptr;
+ sstatus.tstamp = status->tstamp;
+ sstatus.suspended_state = status->suspended_state;
+ sstatus.audio_tstamp = status->audio_tstamp;
}
- if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
- if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
+ if (snd_pcm_sync_ptr_put_user(sstatus, scontrol, _sync_ptr))
return -EFAULT;
return 0;
}
--
2.47.0
