linux-kernel - [PATCH AUTOSEL 6.11 070/244] wifi: wilc1000: Do not operate uninitialized hardware during suspend/resume

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Message-ID: <20240925113641.1297102-70-sashal@kernel.org>
Date: Wed, 25 Sep 2024 07:24:51 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Marek Vasut <marex@...x.de>,
	Alexis Lothoré <alexis.lothore@...tlin.com>,
	Kalle Valo <kvalo@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	ajay.kathat@...rochip.com,
	claudiu.beznea@...on.dev,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.11 070/244] wifi: wilc1000: Do not operate uninitialized hardware during suspend/resume

From: Marek Vasut <marex@...x.de>

[ Upstream commit b0dc7018477e8fbb7e40c908c29cf663d06b17a7 ]

In case the hardware is not initialized, do not operate it during
suspend/resume cycle, the hardware is already off so there is no
reason to access it.

In fact, wilc_sdio_enable_interrupt() in the resume callback does
interfere with the same call when initializing the hardware after
resume and makes such initialization after resume fail. Fix this
by not operating uninitialized hardware during suspend/resume.

Signed-off-by: Marek Vasut <marex@...x.de>
Reviewed-by: Alexis Lothoré <alexis.lothore@...tlin.com>
Signed-off-by: Kalle Valo <kvalo@...nel.org>
Link: https://patch.msgid.link/20240821183639.163187-1-marex@denx.de
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/microchip/wilc1000/sdio.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/wireless/microchip/wilc1000/sdio.c b/drivers/net/wireless/microchip/wilc1000/sdio.c
index 0043f7a0fdf97..7999aeb76901f 100644
--- a/drivers/net/wireless/microchip/wilc1000/sdio.c
+++ b/drivers/net/wireless/microchip/wilc1000/sdio.c
@@ -977,6 +977,9 @@ static int wilc_sdio_suspend(struct device *dev)
 
 	dev_info(dev, "sdio suspend\n");
 
+	if (!wilc->initialized)
+		return 0;
+
 	if (!IS_ERR(wilc->rtc_clk))
 		clk_disable_unprepare(wilc->rtc_clk);
 
@@ -999,6 +1002,10 @@ static int wilc_sdio_resume(struct device *dev)
 	struct wilc *wilc = sdio_get_drvdata(func);
 
 	dev_info(dev, "sdio resume\n");
+
+	if (!wilc->initialized)
+		return 0;
+
 	wilc_sdio_init(wilc, true);
 	wilc_sdio_enable_interrupt(wilc);
 
-- 
2.43.0