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Date:   Thu, 10 Aug 2023 00:37:03 +0200
From:   hch <hch@lst.de>
To:     Richard Weinberger <richard@nod.at>
Cc:     hch <hch@lst.de>, Stephan Wurm <stephan.wurm@a-eberle.de>,
        linux-block <linux-block@vger.kernel.org>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        linux-mtd <linux-mtd@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Johannes Eigner <johannes.eigner@a-eberle.de>
Subject: Re: ubiblock: null pointer dereference using scatterlist in
 work_queue
Message-ID: <20230809223703.GA10719@lst.de>
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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.