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

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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;
}