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From:   Dmitry Antipov <dmantipov@yandex.ru>
To:     Kalle Valo <kvalo@kernel.org>
Cc:     Brian Norris <briannorris@chromium.org>,
        linux-wireless@vger.kernel.org, lvc-project@linuxtesting.org,
        Dmitry Antipov <dmantipov@yandex.ru>
Subject: [PATCH 5/5] wifi: mwifiex: handle possible mwifiex_write_reg() errors
Date:   Wed, 26 Jul 2023 10:20:56 +0300
Message-ID: <20230726072114.51964-5-dmantipov@yandex.ru>
In-Reply-To: <20230726072114.51964-1-dmantipov@yandex.ru>
References: <20230726072114.51964-1-dmantipov@yandex.ru>
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Return -1 on possible 'mwifiex_write_reg()' errors in
'mwifiex_init_sdio_ioport()', do not ignore the value
returned by the latter in 'mwifiex_init_sdio()' and
'mwifiex_sdio_up_dev()' as well.

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

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
---
 drivers/net/wireless/marvell/mwifiex/sdio.c | 22 +++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index a24bd40dd41a..0d60484cd5df 100644
--- a/drivers/net/wireless/marvell/mwifiex/sdio.c
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.c
@@ -1083,17 +1083,17 @@ static int mwifiex_init_sdio_ioport(struct mwifiex_adapter *adapter)
 		    "info: SDIO FUNC1 IO port: %#x\n", adapter->ioport);
 
 	/* Set Host interrupt reset to read to clear */
-	if (!mwifiex_read_reg(adapter, card->reg->host_int_rsr_reg, &reg))
-		mwifiex_write_reg(adapter, card->reg->host_int_rsr_reg,
-				  reg | card->reg->sdio_int_mask);
-	else
+	if (mwifiex_read_reg(adapter, card->reg->host_int_rsr_reg, &reg))
+		return -1;
+	if (mwifiex_write_reg(adapter, card->reg->host_int_rsr_reg,
+			      reg | card->reg->sdio_int_mask))
 		return -1;
 
 	/* Dnld/Upld ready set to auto reset */
-	if (!mwifiex_read_reg(adapter, card->reg->card_misc_cfg_reg, &reg))
-		mwifiex_write_reg(adapter, card->reg->card_misc_cfg_reg,
-				  reg | AUTO_RE_ENABLE_INT);
-	else
+	if (mwifiex_read_reg(adapter, card->reg->card_misc_cfg_reg, &reg))
+		return -1;
+	if (mwifiex_write_reg(adapter, card->reg->card_misc_cfg_reg,
+			      reg | AUTO_RE_ENABLE_INT))
 		return -1;
 
 	return 0;
@@ -2525,7 +2525,8 @@ static int mwifiex_init_sdio(struct mwifiex_adapter *adapter)
 	mwifiex_read_reg(adapter, card->reg->host_int_status_reg, &sdio_ireg);
 
 	/* Get SDIO ioport */
-	mwifiex_init_sdio_ioport(adapter);
+	if (mwifiex_init_sdio_ioport(adapter))
+		return -EIO;
 
 	/* Initialize SDIO variables in card */
 	card->mp_rd_bitmap = 0;
@@ -3141,7 +3142,8 @@ static void mwifiex_sdio_up_dev(struct mwifiex_adapter *adapter)
 	 */
 	mwifiex_read_reg(adapter, card->reg->host_int_status_reg, &sdio_ireg);
 
-	mwifiex_init_sdio_ioport(adapter);
+	if (mwifiex_init_sdio_ioport(adapter))
+		dev_err(&card->func->dev, "error enabling SDIO port\n");
 }
 
 static struct mwifiex_if_ops sdio_ops = {
-- 
2.41.0