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nbd: add missing config put

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Fix bug added with the patch:

commit 8f3ea35929
Author: Josef Bacik <[email protected]>
Date:   Mon Jul 16 12:11:35 2018 -0400

    nbd: handle unexpected replies better

where if the timeout handler runs when the completion path is and we fail
to grab the mutex in the timeout handler we will leave a config reference
and cannot free the config later.

Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Mike Christie <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Mike Christie 2019-08-13 11:39:51 -05:00 • committed by Jens Axboe
commit 887e975c41
1 changed files with 3 additions and 1 deletions
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4
drivers/block/nbd.c
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@ -373,8 +373,10 @@ static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req,
}
config = nbd->config;
if (!mutex_trylock(&cmd->lock))
if (!mutex_trylock(&cmd->lock)) {
nbd_config_put(nbd);
return BLK_EH_RESET_TIMER;
}
if (config->num_connections > 1) {
dev_err_ratelimited(nbd_to_dev(nbd),