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nvme: Fix PRP list pointer arithmetic for chained transfers

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The PRP setup code advances prp_pool using u64 pointer
arithmetic:

        prp_pool += page_size;

This increments the pointer by page_size * sizeof(u64)
bytes instead of page_size bytes, resulting in invalid
PRP list addresses when multiple PRP list pages are
required.

The issue becomes visible for large transfers, typically
above 2 MiB when MDTS > 9.

Fix it by using byte-wise pointer arithmetic when
advancing to the next PRP list page.

Signed-off-by: Prashant Kamble <prashant.kamble223@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260518022535.17197-1-prashant.kamble223@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
Prashant Kamble
2026-05-18 07:55:35 +05:30
committed by Neil Armstrong
parent 4e91d9ff33
commit 4f51050598
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/nvme.c
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@@ -94,7 +94,7 @@ static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2,
*(prp_pool + i) = cpu_to_le64((ulong)prp_pool +
page_size);
i = 0;
prp_pool += page_size;
prp_pool = (u64 *)((uintptr_t)prp_pool + page_size);
}
*(prp_pool + i++) = cpu_to_le64(dma_addr);
dma_addr += page_size;