linux-kernel - Re: [PATCH v3 3/3] scsi: Set allocation length to 255 for ATA Information VPD page

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Date:   Tue, 04 Jan 2022 12:57:22 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     "Maciej W. Rozycki" <macro@...am.me.uk>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        Douglas Gilbert <dgilbert@...erlog.com>,
        Khalid Aziz <khalid@...ehiking.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Christoph Hellwig <hch@....de>, Nix <nix@...eri.org.uk>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] scsi: Set allocation length to 255 for ATA
 Information VPD page


Maciej,

>  I have tried it and it's neutral, that is with 1/3 applied the HBA still 
> works and with 1/3 removed it still breaks (2/3 and 3/3 obviously don't 
> build anymore).  Unsurprisingly, as it's the call to `scsi_get_vpd_page' 
> rather than `scsi_get_vpd_buf' that causes an issue here.

Oh, you'll also need a follow-on patch that uses the cached ATA
Information VPD page. I'll try to get my full series out today.

>  NB you'll need to adjust drivers/scsi/mpt3sas/mpt3sas_scsih.c accordingly 
> if we are to move forward with this change, as it's another user of the 
> SCSI_VPD_PG_LEN macro.

That'll also use cached information in my series.

-- 
Martin K. Petersen	Oracle Linux Engineering