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fix: imsm: validate strip size - tuned up 

Neil's proposal seems more reasonable and shows what is really going on
here.

Signed-off-by: Przemyslaw Czarnowski <przemyslaw.hawrylewicz.czarnowski@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Hawrylewicz Czarnowski, Przemyslaw 2011-12-07 12:15:55 +11:00 committed by NeilBrown
parent d97a5e6050
commit 70eb8219ac
1 changed files with 3 additions and 4 deletions
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7
platform-intel.h
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@ -124,13 +124,12 @@ static inline int imsm_orom_has_raid5(const struct imsm_orom *orom)
static inline int imsm_orom_has_chunk(const struct imsm_orom *orom, int chunk)
{
int fs = ffs(chunk);
int orom_chunk_bit;
if (!fs)
return 0;
fs--; /* bit num to bit index */
orom_chunk_bit = (orom->sss & (1 << (fs - 1)));
return orom_chunk_bit && 1 << orom_chunk_bit == chunk;
if (chunk & (chunk-1))
return 0; /* not a power of 2 */
return !!(orom->sss & (1 << (fs - 1)));
}