linux-kernel - [PATCH] mfd: db8500-prcmu: check return of devm

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Message-Id: <1414660895-29255-1-git-send-email-pramod.gurav@smartplayin.com>
Date:	Thu, 30 Oct 2014 14:51:35 +0530
From:	Pramod Gurav <pramod.gurav@...rtplayin.com>
To:	linux-kernel@...r.kernel.org
Cc:	Pramod Gurav <pramod.gurav@...rtplayin.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH] mfd: db8500-prcmu: check return of devm_ioremap for error

Error check around return value of devm_ioremap is missing. Add the same
to avoid NULL pointer dereference.

Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Pramod Gurav <pramod.gurav@...rtplayin.com>
---
 drivers/mfd/db8500-prcmu.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index 193cf16..89ae8bf 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -3167,6 +3167,11 @@ static int db8500_prcmu_probe(struct platform_device *pdev)
 	}
 	tcdm_base = devm_ioremap(&pdev->dev, res->start,
 			resource_size(res));
+	if (!tcdm_base) {
+		dev_err(&pdev->dev,
+			"failed to ioremap prcmu-tcdm register memory\n");
+		return -ENOENT;
+	}
 
 	/* Clean up the mailbox interrupts after pre-kernel code. */
 	writel(ALL_MBOX_BITS, PRCM_ARM_IT1_CLR);
-- 
1.7.9.5

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