linux-kernel - [PATCH 2/2] net: encx24j600: Fix invalid logic in reading of MISTAT register

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Message-Id: <20221201173408.26954-2-goncharenko.vp@ispras.ru>
Date:   Thu,  1 Dec 2022 20:34:08 +0300
From:   Valentina Goncharenko <goncharenko.vp@...ras.ru>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Valentina Goncharenko <goncharenko.vp@...ras.ru>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jon Ringle <jringle@...dpoint.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: [PATCH 2/2] net: encx24j600: Fix invalid logic in reading of MISTAT register

A loop for reading MISTAT register continues while regmap_read() fails
and (mistat & BUSY), but if regmap_read() fails a value of mistat is
undefined.

The patch proposes to check for BUSY flag only when regmap_read()
succeed. Compile test only.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: d70e53262f5c ("net: Microchip encx24j600 driver")
Signed-off-by: Valentina Goncharenko <goncharenko.vp@...ras.ru>
---
 drivers/net/ethernet/microchip/encx24j600-regmap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/encx24j600-regmap.c b/drivers/net/ethernet/microchip/encx24j600-regmap.c
index 2e337c7a5773..5693784eec5b 100644
--- a/drivers/net/ethernet/microchip/encx24j600-regmap.c
+++ b/drivers/net/ethernet/microchip/encx24j600-regmap.c
@@ -359,7 +359,7 @@ static int regmap_encx24j600_phy_reg_read(void *context, unsigned int reg,
 		goto err_out;
 
 	usleep_range(26, 100);
-	while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) != 0) &&
+	while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) == 0) &&
 	       (mistat & BUSY))
 		cpu_relax();
 
@@ -397,7 +397,7 @@ static int regmap_encx24j600_phy_reg_write(void *context, unsigned int reg,
 		goto err_out;
 
 	usleep_range(26, 100);
-	while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) != 0) &&
+	while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) == 0) &&
 	       (mistat & BUSY))
 		cpu_relax();
 
-- 
2.25.1