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[SCSI] scsi_lib.c: properly count the number of pages in scsi_req_map_sg()

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The calculation of nr_pages in scsi_req_map_sg() doesn't account for
the fact that the first page could have an offset that pushes the end
of the buffer onto a new page.

Signed-off-by: Bryan Holty <lgeek@frontiernet.net>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Bryan Holty 2006-03-22 06:35:39 -06:00 committed by James Bottomley
parent 9f434d4f84
commit f52359622f
1 changed files with 1 additions and 1 deletions
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drivers/scsi/scsi_lib.c
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@ -367,7 +367,7 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
int nsegs, unsigned bufflen, gfp_t gfp)
{
struct request_queue *q = rq->q;
int nr_pages = (bufflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
unsigned int data_len = 0, len, bytes, off;
struct page *page;
struct bio *bio = NULL;