linux-kernel - [PATCH] spi: npcm-fiu: Fix UMA reads when dummy.nbytes == 0

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Date:   Fri, 22 Sep 2023 11:28:12 -0700
From:   "William A. Kennington III" <william@...nnington.com>
To:     tmaimon77@...il.com, tali.perry1@...il.com, avifishman70@...il.com,
        broonie@...nel.org, joel@....id.au
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "William A. Kennington III" <william@...nnington.com>
Subject: [PATCH] spi: npcm-fiu: Fix UMA reads when dummy.nbytes == 0

We don't want to use the value of ilog2(0) as dummy.buswidth is 0 when
dummy.nbytes is 0. Since we have no dummy bytes, we don't need to
configure the dummy byte bits per clock register value anyway.

Signed-off-by: William A. Kennington III <william@...nnington.com>
---
 drivers/spi/spi-npcm-fiu.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-npcm-fiu.c b/drivers/spi/spi-npcm-fiu.c
index 0ca21ff0e9cc..e42248519688 100644
--- a/drivers/spi/spi-npcm-fiu.c
+++ b/drivers/spi/spi-npcm-fiu.c
@@ -353,8 +353,9 @@ static int npcm_fiu_uma_read(struct spi_mem *mem,
 		uma_cfg |= ilog2(op->cmd.buswidth);
 		uma_cfg |= ilog2(op->addr.buswidth)
 			<< NPCM_FIU_UMA_CFG_ADBPCK_SHIFT;
-		uma_cfg |= ilog2(op->dummy.buswidth)
-			<< NPCM_FIU_UMA_CFG_DBPCK_SHIFT;
+		if (op->dummy.nbytes)
+			uma_cfg |= ilog2(op->dummy.buswidth)
+				<< NPCM_FIU_UMA_CFG_DBPCK_SHIFT;
 		uma_cfg |= ilog2(op->data.buswidth)
 			<< NPCM_FIU_UMA_CFG_RDBPCK_SHIFT;
 		uma_cfg |= op->dummy.nbytes << NPCM_FIU_UMA_CFG_DBSIZ_SHIFT;
-- 
2.42.0.515.g380fc7ccd1-goog