linux-kernel - [PATCH] misc: sram: fix check of devm_ioremap

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Date:	Mon,  7 Mar 2016 02:41:56 +0200
From:	Vladimir Zapolskiy <vz@...ia.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Abhilash Kesavan <a.kesavan@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] misc: sram: fix check of devm_ioremap_wc() return value

The devm_ioremap_wc() function returns either a valid pointer to iomem
region or NULL, check for IS_ERR() is bogus.

The problem was introduced by commit 0ab163ad1ea0 ("misc: sram: switch
to ioremap_wc from ioremap") and it survived after the recent MMIO
SRAM driver refactoring.

Signed-off-by: Vladimir Zapolskiy <vz@...ia.com>
---
 drivers/misc/sram.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 736dae7..9174623 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -361,8 +361,8 @@ static int sram_probe(struct platform_device *pdev)
 	}
 
 	sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size);
-	if (IS_ERR(sram->virt_base))
-		return PTR_ERR(sram->virt_base);
+	if (!sram->virt_base)
+		return -ENOMEM;
 
 	sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
 					  NUMA_NO_NODE, NULL);
-- 
2.1.4