linux-kernel - [tip:irq/urgent] irqchip/mbigen: Fix memory mapping code

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Message-ID: <tip-5ba9b0a14132d0b8d97affe909f324045a968d03@git.kernel.org>
Date:   Fri, 12 May 2017 01:34:35 -0700
From:   tip-bot for Hanjun Guo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, tglx@...utronix.de, mingo@...nel.org,
        wangkefeng.wang@...wei.com, linux-kernel@...r.kernel.org,
        marc.zyngier@....com, majun258@...wei.com, hanjun.guo@...aro.org,
        weiyongjun1@...wei.com
Subject: [tip:irq/urgent] irqchip/mbigen: Fix memory mapping code

Commit-ID:  5ba9b0a14132d0b8d97affe909f324045a968d03
Gitweb:     http://git.kernel.org/tip/5ba9b0a14132d0b8d97affe909f324045a968d03
Author:     Hanjun Guo <hanjun.guo@...aro.org>
AuthorDate: Fri, 12 May 2017 11:55:26 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 12 May 2017 10:25:37 +0200

irqchip/mbigen: Fix memory mapping code

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>
Acked-by: Marc Zyngier <marc.zyngier@....com>
Cc: Kefeng Wang <wangkefeng.wang@...wei.com>
Cc: linuxarm@...wei.com
Cc: Wei Yongjun <weiyongjun1@...wei.com>
Cc: MaJun <majun258@...wei.com>
Link: http://lkml.kernel.org/r/1494561328-39514-2-git-send-email-guohanjun@huawei.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 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..0f5e66e 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);