Re: [PATCH] nbd: add a missed nbd_config_put() in nbd_xmit_timeout()

["sunke (E)" <sunke32@huawei.com>]

Thanks for your review.

在 2019/8/12 23:34, Mike Christie 写道:
> On 08/12/2019 07:31 AM, Sun Ke wrote:
> > When try to get the lock failed, before return, execute the
> > nbd_config_put() to decrease the nbd->config_refs.
> >
> > If the nbd->config_refs is added but not decreased. Then will not
> > execute nbd_clear_sock() in nbd_config_put(). bd->task_setup will
> > not be cleared away. Finally, print"Device being setup by another
> > task" in nbd_add_sock() and nbd device can not be reused.
> >
> > Fixes: 8f3ea35929a0 ("nbd: handle unexpected replies better")
> > Signed-off-by: Sun Ke <sunke32@huawei.com>
> > ---
> >   drivers/block/nbd.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> > index e21d2de..a69a90a 100644
> > --- a/drivers/block/nbd.c
> > +++ b/drivers/block/nbd.c
> > @@ -357,8 +357,10 @@ 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),
>
> I just sent the same patch
>
> https://www.spinics.net/lists/linux-block/msg43718.html
>
> here
>
> https://www.spinics.net/lists/linux-block/msg43715.html
>
> so it looks good to me.
>
> Reviewed-by: Mike Christie <mchristi@redhat.com>
>
> .