Re: [PATCH v3 0/2] block,scsi: fixup blk_get_request dead queue scenarios

From: Jeff Moyer
Date: Tue Aug 26 2014 - 18:01:41 EST

Jens Axboe <axboe@xxxxxxxxx> writes:

>> I have applied the first one, will look over the second one and hand
>> apply it. Seems the NULL return was completely removed, so we _should_
>> be ok on the IS_ERR() conversion, though that sort of thing always
>> worries me a little bit. A NULL return can quickly show up again, and
>> then they would all fail.

Well, we could guard against that with a BUG_ON in blk_get_request,

> Additionally, there's still quite a few places that call
> blk_get_request() and don't check the error return if __GFP_WAIT is set.
> Since most of the point of this is to fix segfaulting on queue dead
> scenarios, why aren't they all converted?

Odd, I thought they all were converted last I checked. They definitely
should be.

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