Messages in this thread | | | Subject | Re: [PATCH] scsi: libsas: fix ata xfer length | From | John Garry <> | Date | Mon, 20 Mar 2017 08:59:40 +0000 |
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On 19/03/2017 17:21, Martin K. Petersen wrote: > John Garry <john.garry@huawei.com> 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.
Cheers, John
> Applied to 4.11/scsi-fixes. >
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