linux-kernel - [PATCH 1/3] irqchip/mbigen: Fix memory mapping code

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Date:   Tue, 2 May 2017 15:06:34 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        MaJun <majun258@...wei.com>, <linux-kernel@...r.kernel.org>,
        Hanjun Guo <hanjun.guo@...aro.org>
Subject: [PATCH 1/3] irqchip/mbigen: Fix memory mapping code

From: Hanjun Guo <hanjun.guo@...aro.org>

Some mbigens share memory regions, and devm_ioremap_resource
does not allow to share resources which will break the probe
of mbigen, in opposition to devm_ioremap.

This patch restores back usage of devm_ioremap function, but
with proper error handling and logging.

Fixes: 216646e4d82e ("irqchip/mbigen: Fix return value check in mbigen_device_probe()")
Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
---
 drivers/irqchip/irq-mbigen.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index d2306c8..e1d99f4 100644
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -337,9 +337,12 @@ static int mbigen_device_probe(struct platform_device *pdev)
 	mgn_chip->pdev = pdev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mgn_chip->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(mgn_chip->base))
-		return PTR_ERR(mgn_chip->base);
+	mgn_chip->base = devm_ioremap(&pdev->dev, res->start,
+				      resource_size(res));
+	if (!mgn_chip->base) {
+		dev_err(&pdev->dev,"failed to ioremap %pR\n", res);
+		return -ENOMEM;
+	}
 
 	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
 		err = mbigen_of_create_domain(pdev, mgn_chip);
-- 
1.7.12.4