linux-kernel - [PATCH] wifi: wilc1000: Handle wilc_sdio_cmd52() failure in wilc_sdio_read

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Message-ID: <20250517154611.910-1-vulab@iscas.ac.cn>
Date: Sat, 17 May 2025 23:46:11 +0800
From: Wentao Liang <vulab@...as.ac.cn>
To: ajay.kathat@...rochip.com,
	claudiu.beznea@...on.dev,
	kvalo@...nel.org
Cc: linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Wentao Liang <vulab@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH] wifi: wilc1000: Handle wilc_sdio_cmd52() failure in wilc_sdio_read_init()

The wilc_sdio_read_init() calls wilc_sdio_cmd52() but does not check the
return value. This could lead to execution with potentially invalid data
if wilc_sdio_cmd52() fails. A proper implementation can be found in
wilc_sdio_read_reg().

Add error handling for wilc_sdio_cmd52(). If wilc_sdio_cmd52() fails,
log an error message via dev_err().

Fixes: eda308be643f ("staging: wilc1000: refactor interrupt handling for sdio")
Cc: stable@...r.kernel.org # v5.7
Signed-off-by: Wentao Liang <vulab@...as.ac.cn>
---
 drivers/net/wireless/microchip/wilc1000/sdio.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/microchip/wilc1000/sdio.c b/drivers/net/wireless/microchip/wilc1000/sdio.c
index e7a2bc9f9902..d0e8b812b622 100644
--- a/drivers/net/wireless/microchip/wilc1000/sdio.c
+++ b/drivers/net/wireless/microchip/wilc1000/sdio.c
@@ -809,6 +809,7 @@ static int wilc_sdio_read_int(struct wilc *wilc, u32 *int_status)
 	u32 tmp;
 	u8 irq_flags;
 	struct sdio_cmd52 cmd;
+	int ret;
 
 	wilc_sdio_read_size(wilc, &tmp);
 
@@ -827,7 +828,12 @@ static int wilc_sdio_read_int(struct wilc *wilc, u32 *int_status)
 	cmd.raw = 0;
 	cmd.read_write = 0;
 	cmd.data = 0;
-	wilc_sdio_cmd52(wilc, &cmd);
+	ret = wilc_sdio_cmd52(wilc, &cmd);
+	if (ret) {
+		dev_err(&func->devm, "Fail cmd 52, get IRQ register...\n");
+		return ret;
+	}
+
 	irq_flags = cmd.data;
 
 	if (sdio_priv->irq_gpio)
-- 
2.42.0.windows.2