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gpio: generic: Revert to old error handling in bgpio_map 

Returning an error instead of NULL in bgpio_map if
platform_get_resource_byname does not find a resource was introduced with
commit cf3f2a2c8b ("gpio: generic: improve error handling in bgpio_map").
This results in several qemu runtime failures with default and non-default
configurations, if attempts are made to boot from mmcblk0. Examples for
failures with multi_v7_defconfig are

Machine: vexpress-a9	dtb: vexpress-v2p-ca9
Machine: vexpress-a15	dtb: vexpress-v2p-ca15-tc1

Crash:

VFS: Cannot open root device "mmcblk0" or unknown-block(0,0): error -6
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Looking into the code, always returning an error if bgpio_map fails
does not appear to make much sense, since the code in bgpio_setup_io
specifically supports some of the resources to be NULL.

Fixes: cf3f2a2c8b ("gpio: generic: improve error handling in bgpio_map")
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Guenter Roeck 2015-10-21 00:12:00 -07:00 committed by Linus Walleij
parent c307b00254
commit b2f68b6306
1 changed files with 1 additions and 1 deletions
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2
drivers/gpio/gpio-generic.c
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@ -586,7 +586,7 @@ static void __iomem *bgpio_map(struct platform_device *pdev,
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
if (!r)
return IOMEM_ERR_PTR(-EINVAL);
return NULL;
sz = resource_size(r);
if (sz != sane_sz)