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authorTony Lindgren <tony@atomide.com>2013-05-09 08:27:25 -0700
committerTony Lindgren <tony@atomide.com>2013-05-09 09:06:27 -0700
commitb1dd11d60e5357c13d3f3decfb69bd07dde159bd (patch)
tree665f023a7ead23abfeac88f6c842323783be92b9 /arch
parent827897c05c3da95dcd0ae44549563525a3554e00 (diff)
ARM: OMAP2+: Remove bogus IS_ERR_OR_NULL checking from id.c
Commit 6770b211 (ARM: OMAP2+: Export SoC information to userspace) had some broken return value handling as noted by Russell King: + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR_OR_NULL(soc_dev)) { + kfree(soc_dev_attr); + return; + } + + parent = soc_device_to_device(soc_dev); + if (!IS_ERR_OR_NULL(parent)) + device_create_file(parent, &omap_soc_attr); This is nonsense. For the first, IS_ERR() is sufficient. For the second, tell me what error checking is required in the return value of this function: struct device *soc_device_to_device(struct soc_device *soc_dev) { return &soc_dev->dev; } when you've already determined that the passed soc_dev is a valid pointer. If you read the comments against the prototype: /** * soc_device_to_device - helper function to fetch struct device * @soc: Previously registered SoC device container */ struct device *soc_device_to_device(struct soc_device *soc); if "soc" is valid, it means the "previously registered SoC device container" must have succeeded and that can only happen if the struct device has been registered. Ergo, there will always be a valid struct device pointer for any registered SoC device container. Therefore, if soc_device_register() succeeds, then the return value from soc_device_to_device() will always be valid and no error checking of it is required. Simples. The rule as ever applies here: get to know the APIs your using and don't fumble around in the dark hoping that you'll get this stuff right. Fix it as noted by Russell. Reported-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-omap2/id.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 9bc5a18794f..1272c41d474 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -648,13 +648,12 @@ void __init omap_soc_device_init(void)
soc_dev_attr->revision = soc_rev;
soc_dev = soc_device_register(soc_dev_attr);
- if (IS_ERR_OR_NULL(soc_dev)) {
+ if (IS_ERR(soc_dev)) {
kfree(soc_dev_attr);
return;
}
parent = soc_device_to_device(soc_dev);
- if (!IS_ERR_OR_NULL(parent))
- device_create_file(parent, &omap_soc_attr);
+ device_create_file(parent, &omap_soc_attr);
}
#endif /* CONFIG_SOC_BUS */