On 01/18/2017 11:32 PM, Dan Carpenter wrote:
> Hello Jens Axboe,
>
> This is a semi-automatic email about new static checker warnings.
>
> The patch bd166ef183c2: "blk-mq-sched: add framework for MQ capable
> IO schedulers" from Jan 17, 2017, leads to the following Smatch
> complaint:
>
> block/elevator.c:234 elevator_init()
> error: we previously assumed 'e' could be null (see line 229)
>
> block/elevator.c
> 228
> 229 if (!e) {
> ^^
> Null.
>
> 230 printk(KERN_ERR
> 231 "Default I/O scheduler not
> found. " \
> 232 "Using noop/none.\n");
> 233 if (q->mq_ops) {
> 234 elevator_put(e);
> ^^^^^^^^^^^^^^^
> This will Oops.
>
> 235 return 0;
> 236 }
Good find, thanks Dan. I've killed the elevator_put().
--
Jens Axboe
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