linux-kernel - [PATCH] mmc: sdhci-of-esdhc: Check for error num after setting mask

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Message-Id: <20220106021638.2527426-1-jiasheng@iscas.ac.cn>
Date:   Thu,  6 Jan 2022 10:16:38 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] mmc: sdhci-of-esdhc: Check for error num after setting mask

Because of the possible failure of the dma_supported(), the
dma_set_mask_and_coherent() may return error num.
Therefore, it should be better to check it and return the error if
fails.
Also, the caller, esdhc_of_resume(), should deal with the return value.
Moreover, as the sdhci_esdhc_driver has not been used, it does not need to
be considered.

Fixes: 5552d7ad596c ("mmc: sdhci-of-esdhc: set proper dma mask for ls104x chips")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/mmc/host/sdhci-of-esdhc.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index a593b1fbd69e..bedfc7bb5174 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -524,12 +524,16 @@ static void esdhc_of_adma_workaround(struct sdhci_host *host, u32 intmask)
 
 static int esdhc_of_enable_dma(struct sdhci_host *host)
 {
+	int ret;
 	u32 value;
 	struct device *dev = mmc_dev(host->mmc);
 
 	if (of_device_is_compatible(dev->of_node, "fsl,ls1043a-esdhc") ||
-	    of_device_is_compatible(dev->of_node, "fsl,ls1046a-esdhc"))
-		dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
+	    of_device_is_compatible(dev->of_node, "fsl,ls1046a-esdhc")) {
+		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
+		if (ret)
+			return ret;
+	}
 
 	value = sdhci_readl(host, ESDHC_DMA_SYSCTL);
 
@@ -1245,7 +1249,10 @@ static int esdhc_of_resume(struct device *dev)
 
 	if (ret == 0) {
 		/* Isn't this already done by sdhci_resume_host() ? --rmk */
-		esdhc_of_enable_dma(host);
+		ret = esdhc_of_enable_dma(host);
+		if (ret)
+			return ret;
+
 		sdhci_writel(host, esdhc_proctl, SDHCI_HOST_CONTROL);
 	}
 	return ret;
-- 
2.25.1