linux-kernel - [MXS MMC 4/5] Check the return codes of clk_enable() and mxs_reset

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Date:	Tue,  6 Dec 2011 14:41:29 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Shawn Guo <shawn.guo@...aro.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chris Ball <cjb@...top.org>,
	Lothar Waßmann <LW@...O-electronics.de>
Subject: [MXS MMC 4/5] Check the return codes of clk_enable() and mxs_reset_block()

Add an int return value to mxs_mmc_reset(), so that the return code of
mxs_reset_block() can be promoted to the caller.
Also check the return code of clk_enable() in the probe function.

Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
---
 drivers/mmc/host/mxs-mmc.c |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index a9b70d2..0003d03 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -185,11 +185,14 @@ static int mxs_mmc_get_cd(struct mmc_host *mmc)
 		 BM_SSP_STATUS_CARD_DETECT);
 }
 
-static void mxs_mmc_reset(struct mxs_mmc_host *host)
+static int mxs_mmc_reset(struct mxs_mmc_host *host)
 {
+	int ret;
 	u32 ctrl0, ctrl1;
 
-	mxs_reset_block(host->base);
+	ret = mxs_reset_block(host->base);
+	if (ret)
+		return ret;
 
 	ctrl0 = BM_SSP_CTRL0_IGNORE_CRC;
 	ctrl1 = BF_SSP(0x3, CTRL1_SSP_MODE) |
@@ -214,6 +217,7 @@ static void mxs_mmc_reset(struct mxs_mmc_host *host)
 
 	writel(ctrl0, host->base + HW_SSP_CTRL0);
 	writel(ctrl1, host->base + HW_SSP_CTRL1);
+	return 0;
 }
 
 static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
@@ -712,9 +716,19 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 		ret = PTR_ERR(host->clk);
 		goto out_iounmap;
 	}
-	clk_enable(host->clk);
+	ret = clk_enable(host->clk);
+	if (ret) {
+		dev_err(mmc_dev(host->mmc),
+			"%s: failed to enable clock: %d\n", __func__, ret);
+		goto out_clk_put;
+	}
 
-	mxs_mmc_reset(host);
+	ret = mxs_mmc_reset(host);
+	if (ret) {
+		dev_err(mmc_dev(host->mmc),
+			"%s: failed to reset controller: %d\n", __func__, ret);
+		goto out_clk_put;
+	}
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
@@ -829,7 +843,9 @@ static int mxs_mmc_resume(struct device *dev)
 	struct mxs_mmc_host *host = mmc_priv(mmc);
 	int ret = 0;
 
-	clk_enable(host->clk);
+	ret = clk_enable(host->clk);
+	if (ret)
+		return ret;
 
 	ret = mmc_resume_host(mmc);
 
-- 
1.5.6.5

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