linux-kernel - [PATCH 3.16 066/328] ALSA: seq: Fix poll() error return

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Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Takashi Iwai" <tiwai@...e.de>
Subject: [PATCH 3.16 066/328] ALSA: seq: Fix poll() error return

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Takashi Iwai <tiwai@...e.de>

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.

Signed-off-by: Takashi Iwai <tiwai@...e.de>
[bwh: Backported to 3.16: s/EPOLLERR/POLLERR/]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -194,7 +194,7 @@ 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
@@ -1110,7 +1110,7 @@ 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) {