From a49a71f6e25da2acc637fcd31e73debd96ca18f8 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 25 Jul 2018 16:34:12 +0200
Subject: [PATCH] ALSA: seq: Fix poll() error return
Git-commit: a49a71f6e25da2acc637fcd31e73debd96ca18f8
Patch-mainline: v4.19-rc1
References: bsc#1121278

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@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 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 POLLERR;
 	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 unsigned int snd_seq_poll(struct
 
 	/* check client structures are in place */
 	if (snd_BUG_ON(!client))
-		return -ENXIO;
+		return POLLERR;
 
 	if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
 	    client->data.user.fifo) {