From: Keith Busch <kbusch@kernel.org>
Date: Mon, 19 Dec 2022 13:54:55 -0800
Subject: nvme-pci: fix page size checks
Patch-mainline: v6.2-rc2
Git-commit: 841734234a28fd5cd0889b84bd4d93a0988fa11e
References: git-fixes

The size allocated out of the dma pool is at most NVME_CTRL_PAGE_SIZE,
which may be smaller than the PAGE_SIZE.

Fixes: c61b82c7b7134 ("nvme-pci: fix PRP pool size")
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/nvme/host/pci.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -33,7 +33,7 @@
 #define SQ_SIZE(q)	((q)->q_depth << (q)->sqes)
 #define CQ_SIZE(q)	((q)->q_depth * sizeof(struct nvme_completion))
 
-#define SGES_PER_PAGE	(PAGE_SIZE / sizeof(struct nvme_sgl_desc))
+#define SGES_PER_PAGE	(NVME_CTRL_PAGE_SIZE / sizeof(struct nvme_sgl_desc))
 
 /*
  * These can be higher, but we need to ensure that any command doesn't
@@ -372,7 +372,7 @@ static int nvme_pci_npages_prp(void)
 {
 	unsigned max_bytes = (NVME_MAX_KB_SZ * 1024) + NVME_CTRL_PAGE_SIZE;
 	unsigned nprps = DIV_ROUND_UP(max_bytes, NVME_CTRL_PAGE_SIZE);
-	return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
+	return DIV_ROUND_UP(8 * nprps, NVME_CTRL_PAGE_SIZE - 8);
 }
 
 /*
@@ -382,7 +382,7 @@ static int nvme_pci_npages_prp(void)
 static int nvme_pci_npages_sgl(void)
 {
 	return DIV_ROUND_UP(NVME_MAX_SEGS * sizeof(struct nvme_sgl_desc),
-			PAGE_SIZE);
+			NVME_CTRL_PAGE_SIZE);
 }
 
 static size_t nvme_pci_iod_alloc_size(void)
@@ -732,7 +732,7 @@ static void nvme_pci_sgl_set_seg(struct
 		sge->length = cpu_to_le32(entries * sizeof(*sge));
 		sge->type = NVME_SGL_FMT_LAST_SEG_DESC << 4;
 	} else {
-		sge->length = cpu_to_le32(PAGE_SIZE);
+		sge->length = cpu_to_le32(NVME_CTRL_PAGE_SIZE);
 		sge->type = NVME_SGL_FMT_SEG_DESC << 4;
 	}
 }