linux-kernel - Re: Report in downstream Debian: mpt3sas broken with xen dom0 with update to 5.10.149 in 5.10.y.

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Date:   Mon, 24 Oct 2022 14:50:26 -0400
From:   James Bottomley <jejb@...ux.ibm.com>
To:     Juergen Gross <jgross@...e.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Bart Van Assche <bvanassche@....org>
Cc:     Salvatore Bonaccorso <carnil@...ian.org>,
        sathya.prakash@...adcom.com, suganath-prabu.subramani@...adcom.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        adi@...egisch.at
Subject: Re: Report in downstream Debian: mpt3sas broken with xen dom0 with
 update to 5.10.149 in 5.10.y.

On Mon, 2022-10-24 at 14:55 +0200, Juergen Gross wrote:
[...]
> Please recheck the backported patch in 5.10.y. It is _wrong_. The
> backport
> has:
> 
> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
> @@ -2993,7 +2993,7 @@ _base_config_dma_addressing(struct
> MPT3SAS_ADAPTER *ioc, 
> struct pci_dev *pdev)
> 
>          if (ioc->is_mcpu_endpoint ||
>              sizeof(dma_addr_t) == 4 || ioc->use_32bit_dma ||
> -           dma_get_required_mask(&pdev->dev) <= 32)
> +           dma_get_required_mask(&pdev->dev) <= DMA_BIT_MASK(32))
>                  ioc->dma_mask = 32;
>          /* Set 63 bit DMA mask for all SAS3 and SAS35 controllers */
>          else if (ioc->hba_mpi_version_belonged > MPI2_VERSION)
> 
> While the upstream patch has:
> 
> +       if (ioc->is_mcpu_endpoint || sizeof(dma_addr_t) == 4 ||
> +           dma_get_required_mask(&pdev->dev) <= 32) {
>                  ioc->dma_mask = 32;
> +               coherent_dma_mask = dma_mask = DMA_BIT_MASK(32);
> 

That's not the upstream commit.  The quoted upstream patch in the
stable commit is:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e0e0747de0ea3dd87cdbb0393311e17471a9baf1

Which has the same diff as you quoted for the stable tree.

James


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