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media: saa7164: fix return codes for the polling routine 

All poll handlers should return a poll flag, and not error codes. So,
instead of returning an error, do the right thing at saa7164,
e. g. to return EPOLERR on errors, just like the V4L2 VB2 code.

Solves the following sparse warnings:
    drivers/media/pci/saa7164/saa7164-vbi.c:632:24: warning: incorrect type in return expression (different base types)
    drivers/media/pci/saa7164/saa7164-vbi.c:632:24:    expected restricted __poll_t
    drivers/media/pci/saa7164/saa7164-vbi.c:632:24:    got int
    drivers/media/pci/saa7164/saa7164-vbi.c:637:40: warning: incorrect type in return expression (different base types)
    drivers/media/pci/saa7164/saa7164-vbi.c:637:40:    expected restricted __poll_t
    drivers/media/pci/saa7164/saa7164-vbi.c:637:40:    got int
    drivers/media/pci/saa7164/saa7164-vbi.c:647:40: warning: incorrect type in return expression (different base types)
    drivers/media/pci/saa7164/saa7164-vbi.c:647:40:    expected restricted __poll_t
    drivers/media/pci/saa7164/saa7164-vbi.c:647:40:    got int

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
hifive-unleashed-5.1
Mauro Carvalho Chehab 2018-08-07 09:18:26 -04:00
parent 541b647a34
commit 9de1be6ec0
1 changed files with 3 additions and 3 deletions
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6
drivers/media/pci/saa7164/saa7164-vbi.c
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@ -629,12 +629,12 @@ static __poll_t fops_poll(struct file *file, poll_table *wait)
port->last_poll_msecs_diff);
if (!video_is_registered(port->v4l_device))
return -EIO;
return EPOLLERR;
if (atomic_cmpxchg(&fh->v4l_reading, 0, 1) == 0) {
if (atomic_inc_return(&port->v4l_reader_count) == 1) {
if (saa7164_vbi_initialize(port) < 0)
return -EINVAL;
return EPOLLERR;
saa7164_vbi_start_streaming(port);
msleep(200);
}
@ -644,7 +644,7 @@ static __poll_t fops_poll(struct file *file, poll_table *wait)
if ((file->f_flags & O_NONBLOCK) == 0) {
if (wait_event_interruptible(port->wait_read,
saa7164_vbi_next_buf(port))) {
return -ERESTARTSYS;
return EPOLLERR;
}
}