linux-kernel - [PATCH 3/5] MMC: OMAP: fix broken slot switch lookup

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Message-Id: <20240223181439.1099750-4-aaro.koskinen@iki.fi>
Date: Fri, 23 Feb 2024 20:14:37 +0200
From: Aaro Koskinen <aaro.koskinen@....fi>
To: Tony Lindgren <tony@...mide.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-omap@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Aaro Koskinen <aaro.koskinen@....fi>
Subject: [PATCH 3/5] MMC: OMAP: fix broken slot switch lookup

The lookup is done before host->dev is initialized. It will always just
fail silently, and the MMC behaviour is totally unpredictable as the switch
is left in an undefined state. Fix that.

Fixes: e519f0bb64ef ("ARM/mmc: Convert old mmci-omap to GPIO descriptors")
Signed-off-by: Aaro Koskinen <aaro.koskinen@....fi>
---
 drivers/mmc/host/omap.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 9fb8995b43a1..aa40e1a9dc29 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -1384,13 +1384,6 @@ static int mmc_omap_probe(struct platform_device *pdev)
 	if (IS_ERR(host->virt_base))
 		return PTR_ERR(host->virt_base);
 
-	host->slot_switch = gpiod_get_optional(host->dev, "switch",
-					       GPIOD_OUT_LOW);
-	if (IS_ERR(host->slot_switch))
-		return dev_err_probe(host->dev, PTR_ERR(host->slot_switch),
-				     "error looking up slot switch GPIO\n");
-
-
 	INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
 	INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
 
@@ -1409,6 +1402,12 @@ static int mmc_omap_probe(struct platform_device *pdev)
 	host->dev = &pdev->dev;
 	platform_set_drvdata(pdev, host);
 
+	host->slot_switch = gpiod_get_optional(host->dev, "switch",
+					       GPIOD_OUT_LOW);
+	if (IS_ERR(host->slot_switch))
+		return dev_err_probe(host->dev, PTR_ERR(host->slot_switch),
+				     "error looking up slot switch GPIO\n");
+
 	host->id = pdev->id;
 	host->irq = irq;
 	host->phys_base = res->start;
-- 
2.39.2