ALSA: pcm: Call substream ack() method upon compat mmap commit

stable inclusion
from stable-5.10.54
commit 431e31105579f22c778d02cfcb3b23bd28d69d32
bugzilla: 175586 https://gitee.com/openeuler/kernel/issues/I4DVDU

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=431e31105579f22c778d02cfcb3b23bd28d69d32

--------------------------------

commit 2e283256 upstream.

If a 32-bit application is being used with a 64-bit kernel and is using
the mmap mechanism to write data, then the SNDRV_PCM_IOCTL_SYNC_PTR
ioctl results in calling snd_pcm_ioctl_sync_ptr_compat(). Make this use
pcm_lib_apply_appl_ptr() so that the substream's ack() method, if
defined, is called.

The snd_pcm_sync_ptr() function, used in the 64-bit ioctl case, already
uses snd_pcm_ioctl_sync_ptr_compat().

Fixes: 9027c463 ("ALSA: pcm: Call ack() whenever appl_ptr is updated")
Signed-off-by: NAlan Young <consult.awy@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/c441f18c-eb2a-3bdd-299a-696ccca2de9c@gmail.comSigned-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

sound/core/pcm_native.c

@@ -3062,9 +3062,14 @@ static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
 		boundary = 0x7fffffff;
 	snd_pcm_stream_lock_irq(substream);
 	/* FIXME: we should consider the boundary for the sync from app */
-	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
-		control->appl_ptr = scontrol.appl_ptr;
-	else
+	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
+		err = pcm_lib_apply_appl_ptr(substream,
+				scontrol.appl_ptr);
+		if (err < 0) {
+			snd_pcm_stream_unlock_irq(substream);
+			return err;
+		}
+	} else
 		scontrol.appl_ptr = control->appl_ptr % boundary;
 	if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
 		control->avail_min = scontrol.avail_min;