linux-kernel - Re: ubiblock: null pointer dereference using scatterlist in work

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Message-ID: <533238598.5052964.1691621039144.JavaMail.zimbra@nod.at>
Date:   Thu, 10 Aug 2023 00:43:59 +0200 (CEST)
From:   Richard Weinberger <richard@....at>
To:     hch <hch@....de>
Cc:     Stephan Wurm <stephan.wurm@...berle.de>,
        linux-block <linux-block@...r.kernel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Johannes Eigner <johannes.eigner@...berle.de>
Subject: Re: ubiblock: null pointer dereference using scatterlist in
 work_queue

----- Ursprüngliche Mail -----
> On Thu, Aug 10, 2023 at 12:34:44AM +0200, Richard Weinberger wrote:
>> Will do so! So far I managed to get UBIblock work with scsi_kmap_atomic_sg().
>> Sadly now with kmap'ed memory a bounce buffer is needed since IO in UBI/MTD can
>> sleep.
>> Is there a strong reason why scsi_kmap_atomic_sg() needs IRQs disabled?
> 
> I don't think it needs irqs disabled.  Also if you switch from the
> deprecated kmap_atomic to kmap_local first you can sleep and don't
> need bounce buffers.

Yep, for upstream kmap_local will do the trick, but I need also something
for the stable trees.
Anyway, time to get some sleep.

Thanks,
//richard