ALSA: compress: Fix poll error return codes

We can't return a negative error code from the poll callback the return
type is unsigned and is checked against the poll specific flags we need
to return POLLERR if we encounter an error.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 5215df2..f56f4e3 100644 (file)
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -391,13 +391,13 @@ static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
        int retval = 0;
 
        if (snd_BUG_ON(!data))
-               return -EFAULT;
+               return POLLERR;
 
        stream = &data->stream;
 
        mutex_lock(&stream->device->lock);
        if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
-               retval = -EBADFD;
+               retval = snd_compr_get_poll(stream) | POLLERR;
                goto out;
        }
        poll_wait(f, &stream->runtime->sleep, wait);