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SG: clear termination bit in sg_chain()

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Since we are using the last entry in the list, clear any possible
termination bit that may have already been set. Pointed out by Rusty.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-10-26 09:32:16 +02:00
parent 2a397e82c7
commit 73fd546aa7
1 changed files with 5 additions and 1 deletions
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6
include/linux/scatterlist.h
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@ -179,7 +179,11 @@ static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
#ifndef ARCH_HAS_SG_CHAIN
BUG();
#endif
prv[prv_nents - 1].page_link = (unsigned long) sgl | 0x01;
/*
* Set lowest bit to indicate a link pointer, and make sure to clear
* the termination bit if it happens to be set.
*/
prv[prv_nents - 1].page_link = ((unsigned long) sgl | 0x01) & ~0x02;
}
/**