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ALSA: seq_oss: return full count for successful SEQ_FULLSIZE writes

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commit bbc6c0dda54fc0ad8f8aed0b796c23e186e1a188 upstream.

snd_seq_oss_write() currently returns the raw load_patch() callback
result for SEQ_FULLSIZE events.

That callback is documented as returning 0 on success and -errno on
failure, but snd_seq_oss_write() is the file write path and should
report the number of user bytes consumed on success. Some in-tree
backends also return backend-specific positive values, which can still
be shorter than the original write size.

Return the full byte count for successful SEQ_FULLSIZE writes.
Preserve negative errors and convert any nonnegative completion to the
original count.

Cc: stable@vger.kernel.org
Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260324-alsa-seq-oss-fullsize-write-return-v1-1-66d448510538@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
This commit is contained in:
Cássio Gabriel
2026-03-24 16:59:41 -03:00
committed by Ulrich Hecht
parent ca12c62735
commit 880f7c8d35
1 changed files with 3 additions and 3 deletions
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6
sound/core/seq/oss/seq_oss_rw.c
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@ -114,9 +114,9 @@ snd_seq_oss_write(struct seq_oss_devinfo *dp, const char __user *buf, int count,
break;
}
fmt = (*(unsigned short *)rec.c) & 0xffff;
/* FIXME the return value isn't correct */
return snd_seq_oss_synth_load_patch(dp, rec.s.dev,
fmt, buf, 0, count);
err = snd_seq_oss_synth_load_patch(dp, rec.s.dev,
fmt, buf, 0, count);
return err < 0 ? err : count;
}
if (ev_is_long(&rec)) {
/* extended code */