Re: [PATCH v2] RFD: switch MMC/SD to use blk-mq multiqueueing

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On Mon, Jan 2, 2017 at 12:55 PM, Bart Van Assche
<Bart.VanAssche@xxxxxxxxxxx> wrote:
> On Thu, 2016-12-29 at 00:59 +0100, Linus Walleij wrote:
>> A problem here is that issueing the requests are in blocking context
>> while completion is in IRQ context (for most drivers) so we need to
>> look into this.
>
> Hello Linus,
>
> Although I'm not sure whether I understood you correctly: are you familiar
> with the request queue flag BLK_MQ_F_BLOCKING, a flag that was introduced
> for the nbd driver?

BLK_MQ_F_BLOCKING is what the patch set is currently using...

The problem I have is that request need to be *issued* in blocking
context and *completed* in fastpath/IRQ context.

Yours,
Linus Walleij
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