linux-kernel - Re: [PATCH v2] scsi: pmcraid: Fix memory allocation in 'pmcraid_alloc

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Date:   Mon, 10 Jan 2022 22:01:28 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bart Van Assche <bvanassche@....org>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Hannes Reinecke <hare@...e.com>, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH v2] scsi: pmcraid: Fix memory allocation in
 'pmcraid_alloc_sglist()'


Christoph,

> The whole passthrough ioctl path looks completely broken to me.  For
> example it dma maps the scatterlist and after that copies data to it,
> which is prohibited by the DMA API contract.
>
> So I'd be tempted to just remove the PMCRAID_PASSTHROUGH_IOCTL ioctl
> implementation entirely, and if users for it do pop up we should
> reimplement it using the proper block layer request mapping helpers.

Given that nobody has complained since 2018 I propose we remove it.

-- 
Martin K. Petersen	Oracle Linux Engineering