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| author | Julia Lawall <Julia.Lawall@lip6.fr> | 2012-07-14 20:43:08 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-07-26 17:07:20 +0400 |
| commit | 41fb433b63cc4745f4918fdaf295763da5ca826c (patch) | |
| tree | bc53571406fd54f543129dc5a78f08bd5ec5d9d9 | |
| parent | 61b0fccd7f114573f973dfe25d864608822dc09e (diff) | |
| download | linux-41fb433b63cc4745f4918fdaf295763da5ca826c.tar.xz | |
arch/x86/kernel/kdebugfs.c: Ensure a consistent return value in error case
Typically, the return value desired for the failure of a
function with an integer return value is a negative integer. In
these cases, the return value is sometimes a negative integer
and sometimes 0, due to a subsequent initialization of the
return variable within the loop.
A simplified version of the semantic match that finds this
problem is: (http://coccinelle.lip6.fr/)
//<smpl>
@r exists@
identifier ret;
position p;
constant C;
expression e1,e3,e4;
statement S;
@@
ret = -C
... when != ret = e3
when any
if@p (...) S
... when any
if (\(ret != 0\|ret < 0\|ret > 0\) || ...) { ... return ...; }
... when != ret = e3
when any
*if@p (...)
{
... when != ret = e4
return ret;
}
//</smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Link: http://lkml.kernel.org/r/1342284188-19176-7-git-send-email-Julia.Lawall@lip6.fr
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/kernel/kdebugfs.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/kdebugfs.c b/arch/x86/kernel/kdebugfs.c index 1d5d31ea686b..dc1404bf8e4b 100644 --- a/arch/x86/kernel/kdebugfs.c +++ b/arch/x86/kernel/kdebugfs.c @@ -107,7 +107,7 @@ static int __init create_setup_data_nodes(struct dentry *parent) { struct setup_data_node *node; struct setup_data *data; - int error = -ENOMEM; + int error; struct dentry *d; struct page *pg; u64 pa_data; @@ -121,8 +121,10 @@ static int __init create_setup_data_nodes(struct dentry *parent) while (pa_data) { node = kmalloc(sizeof(*node), GFP_KERNEL); - if (!node) + if (!node) { + error = -ENOMEM; goto err_dir; + } pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT); if (PageHighMem(pg)) { |