4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Takashi Iwai <tiwai@xxxxxxx>
commit a49a71f6e25da2acc637fcd31e73debd96ca18f8 upstream.
The sanity checks in ALSA sequencer and OSS sequencer emulation codes
return falsely -ENXIO from poll callback. They should be EPOLLERR
instead.
This was caught thanks to the recent change to the return value.
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/core/seq/oss/seq_oss.c | 2 +-
sound/core/seq/seq_clientmgr.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/sound/core/seq/oss/seq_oss.c
+++ b/sound/core/seq/oss/seq_oss.c
@@ -203,7 +203,7 @@ odev_poll(struct file *file, poll_table
struct seq_oss_devinfo *dp;
dp = file->private_data;
if (snd_BUG_ON(!dp))
- return -ENXIO;
+ return EPOLLERR;
return snd_seq_oss_poll(dp, file, wait);
}
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -1101,7 +1101,7 @@ static __poll_t snd_seq_poll(struct file
/* check client structures are in place */
if (snd_BUG_ON(!client))
- return -ENXIO;
+ return EPOLLERR;
if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
client->data.user.fifo) {
