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SubjectRe: [PATCH] scsi: libsas: fix ata xfer length
On 19/03/2017 17:21, Martin K. Petersen wrote:
> John Garry <> writes:
> John,
>> The total ata xfer length may not be calculated properly,
>> in that we do not use the proper method to get an sg element
>> dma length.
>> According to the code comment, sg_dma_len() should be used
>> after dma_map_sg() is called.
>> This issue was found by turning on the SMMUv3 in front of
>> the hisi_sas controller in hip07. Multiple sg elements
>> were being combined into a single element, but the original
>> first element length was being use as the total xfer length.

I should have added this originally to the changelog:
Fixes: ff2aeb1eb64c8a4770a6 ("libata: convert to chained sg")

BTW, I am surprised this issue has not been seen in almost 10 years, but
we cannot attach a SATA disk when SMMU enabled without it.


> Applied to 4.11/scsi-fixes.

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