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net: wwan: core: Return poll error in case of port removal 

Ensure that the poll system call returns proper error flags when port
is removed (nullified port ops), allowing user side to properly fail,
without further read or write.

Fixes: 9a44c1cc63 ("net: Add a WWAN subsystem")
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Loic Poulain 2021-04-22 16:06:01 +02:00 committed by David S. Miller
parent a9b5d871ab
commit 57e2224755
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wwan/wwan_core.c
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@ -508,6 +508,8 @@ static __poll_t wwan_port_fops_poll(struct file *filp, poll_table *wait)
mask |= EPOLLOUT | EPOLLWRNORM;
if (!is_read_blocked(port))
mask |= EPOLLIN | EPOLLRDNORM;
if (!port->ops)
mask |= EPOLLHUP | EPOLLERR;
return mask;
}