linux-kernel - [PATCH] platform: Print the resource range if device failed to claim

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Date:   Wed, 21 Dec 2016 17:24:55 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rui Zhang <rui.zhang@...el.com>, Chen Yu <yu.c.chen@...el.com>
Subject: [PATCH] platform: Print the resource range if device failed to claim

Sometimes we have the following error message:
 platform MSFT0101:00: failed to claim resource 1
 acpi MSFT0101:00: platform device creation failed: -16
But there is not enough information to figure out which resource range
failed to claim.

Thus print the resource range at first-place thus /proc/iomem or
ioports should tell us who already claimed this resource, then
the driver bug or incorrect resource assignment which is running
into this conflict can be diagnosed:
 platform MSFT0101:00: failed to claim resource 1: [mem 0xfed40000-0xfed40fff]
 acpi MSFT0101:00: platform device creation failed: -16

Suggested-by: Len Brown <lenb@...nel.org>
Reported-by: Wendy Wang <wendy.wang@...el.com>
Signed-off-by: Chen Yu <yu.c.chen@...el.com>
---
 drivers/base/platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index c4af003..22a6430 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -396,7 +396,7 @@ int platform_device_add(struct platform_device *pdev)
 		}
 
 		if (p && insert_resource(p, r)) {
-			dev_err(&pdev->dev, "failed to claim resource %d\n", i);
+			dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
 			ret = -EBUSY;
 			goto failed;
 		}
-- 
2.7.4