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tun: fix blocking read

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[ Upstream commit 71828b2240 ]

This patch moves setting of the current state into the loop. Otherwise
the task may end up in a busy wait loop if none of the break conditions
are met.

Signed-off-by: Timur Celik <mail@timurcelik.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Timur Celik 2019-02-23 12:53:13 +01:00 committed by Greg Kroah-Hartman
parent ab04570d82
commit 488b940719
1 changed files with 2 additions and 2 deletions
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4
drivers/net/tun.c
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@ -2122,9 +2122,9 @@ static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err)
}
add_wait_queue(&tfile->wq.wait, &wait);
current->state = TASK_INTERRUPTIBLE;
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
ptr = ptr_ring_consume(&tfile->tx_ring);
if (ptr)
break;
@ -2140,7 +2140,7 @@ static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err)
schedule();
}
current->state = TASK_RUNNING;
set_current_state(TASK_RUNNING);
remove_wait_queue(&tfile->wq.wait, &wait);
out: