linux-kernel - [PATCH] ioatdma: Fix compiler warning

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Date:	Tue,  6 Aug 2013 14:36:03 -0700
From:	Jon Mason <jon.mason@...el.com>
To:	Dan Williams <djbw@...com>
Cc:	Dave Jiang <dave.jiang@...el.com>,
	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] ioatdma: Fix compiler warning

GCC v4.6.3 complains:
drivers/dma/ioat/dma_v3.c: In function ‘__ioat3_prep_pq16_lock’:
drivers/dma/ioat/dma_v3.c:264:11: warning: array subscript is below array bounds [-Warray-bounds]
drivers/dma/ioat/dma_v3.c:264:11: warning: array subscript is below array bounds [-Warray-bounds]

This is due to the possibility of idx being negative, thus being outside
the boulds of the array.  Correct this by making idx an unsigned int.

Signed-off-by: Jon Mason <jon.mason@...el.com>
---
 drivers/dma/ioat/dma_v3.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index ca6ea9b..a17ef21 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -251,7 +251,7 @@ static bool is_bwd_noraid(struct pci_dev *pdev)
 }
 
 static void pq16_set_src(struct ioat_raw_descriptor *desc[3],
-			dma_addr_t addr, u32 offset, u8 coef, int idx)
+			 dma_addr_t addr, u32 offset, u8 coef, unsigned int idx)
 {
 	struct ioat_pq_descriptor *pq = (struct ioat_pq_descriptor *)desc[0];
 	struct ioat_pq16a_descriptor *pq16 =
@@ -1180,7 +1180,7 @@ __ioat3_prep_pq16_lock(struct dma_chan *c, enum sum_check_flags *result,
 	struct ioat_pq_descriptor *pq;
 	u32 offset = 0;
 	u8 op;
-	int i, s, idx, num_descs;
+	unsigned int i, s, idx, num_descs;
 
 	/* this function only handles src_cnt 9 - 16 */
 	BUG_ON(src_cnt < 9);
-- 
1.7.9.5

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