linux-kernel - [PATCH V2 4/4] mmc: sdhci-esdhc-imx: validate pinctrl before use it

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Date:   Thu, 21 Jan 2021 11:09:53 +0800
From:   peng.fan@....com
To:     ulf.hansson@...aro.org, robh+dt@...nel.org, shawnguo@...nel.org,
        adrian.hunter@...el.com
Cc:     s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: [PATCH V2 4/4] mmc: sdhci-esdhc-imx: validate pinctrl before use it

From: Peng Fan <peng.fan@....com>

When imx_data->pinctrl is not a valid pointer, pinctrl_lookup_state
will trigger kernel panic.

When we boot Dual OS on Jailhouse hypervisor, we let the 1st Linux to
configure pinmux ready for the 2nd OS, so the 2nd OS not have pinctrl
settings.

Similar to this commit b62eee9f804e ("mmc: sdhci-esdhc-imx: no fail when no pinctrl available").

Reviewed-by: Bough Chen <haobo.chen@....com>
Reviewed-by: Alice Guo <alice.guo@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 16ed19f47939..11d3a2244b36 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1488,7 +1488,7 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
 
 	mmc_of_parse_voltage(np, &host->ocr_mask);
 
-	if (esdhc_is_usdhc(imx_data)) {
+	if (esdhc_is_usdhc(imx_data) && !IS_ERR(imx_data->pinctrl)) {
 		imx_data->pins_100mhz = pinctrl_lookup_state(imx_data->pinctrl,
 						ESDHC_PINCTRL_STATE_100MHZ);
 		imx_data->pins_200mhz = pinctrl_lookup_state(imx_data->pinctrl,
-- 
2.28.0