From: Pramod Gurav <pramod.gurav@smartplayin.com>
Date: Thu, 30 Oct 2014 09:21:35 +0000 (+0530)
Subject: mfd: db8500-prcmu: Check return of devm_ioremap for error
X-Git-Tag: firefly_0821_release~176^2~2781^2~19
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=51a7e02bb629498c32915881ed4fb61ef778282a;p=firefly-linux-kernel-4.4.55.git

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.

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---

diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index 193cf168ba84..89ae8bf665b4 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);