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x86: fix dmi_alloc() to not advance alloc index in case of 

dmi_alloc() for CONFIG_X86_64 is defined to allocate from a static array
and it maintains a allocation index which is advanced each time allocation
is attempted - it gets incremented even if an allocation fails thereby
depriving any future request that may be small enough to be satisfied from
the array.

Fix this by first testing if allocation is going to be possible and
incrementing alloc index only then.

Signed-off-by: Parag Warudkar <parag.warudkar@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Parag Warudkar 2008-01-30 13:31:59 +01:00 committed by Ingo Molnar
parent 79da472111
commit bca25bafbb
1 changed files with 2 additions and 1 deletions
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3
include/asm-x86/dmi.h
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@ -22,8 +22,9 @@ extern char dmi_alloc_data[DMI_MAX_DATA];
static inline void *dmi_alloc(unsigned len) static inline void *dmi_alloc(unsigned len)
{ {
int idx = dmi_alloc_index; int idx = dmi_alloc_index;
if ((dmi_alloc_index += len) > DMI_MAX_DATA) if ((dmi_alloc_index + len) > DMI_MAX_DATA)
return NULL; return NULL;
dmi_alloc_index += len;
return dmi_alloc_data + idx; return dmi_alloc_data + idx;
} }