[PATCH] tun: fix blocking read

[Timur Celik]

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 <m...@timurcelik.de>
---
 drivers/net/tun.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index fed298c0cb39..d291762b9e9d 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2167,9 +2167,9 @@ 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;
@@ -2185,7 +2185,7 @@ 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:
-- 
2.20.1