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Yishai Hadas authored
The last_pg is wrong, it is actually the first page of the last scatterlist element. To get the last page of the last scatterlist element we have to add prv->length. So it is checking mergability against the wrong page, Further, a SG element is not guaranteed to end on a page boundary, so we have to check the sub page location also for merge eligibility. Fix the above by checking physical contiguity based on PFNs, compute the actual last page and then call pages_are_mergable(). Fixes: 1567b49d ("lib/scatterlist: add check when merging zone device pages") Link: https://lore.kernel.org/r/20230111101054.188136-1-yishaih@nvidia.comReported-by:
Jason Gunthorpe <jgg@nvidia.com> Signed-off-by:
Yishai Hadas <yishaih@nvidia.com> Reviewed-by:
Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by:
Jason Gunthorpe <jgg@nvidia.com>
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