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mtip32xx: Correctly handle bio->bi_idx != 0 conditions

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Stacking drivers may append bvecs to existing bio's, resulting
in non-zero bi_idx conditions.  This patch counts the loops of
bio_for_each_segment() rather than inheriting the bi_idx value
to pass as a segment count to the hardware submission routine.

Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Sam Bradshaw 2013-05-15 10:09:05 +02:00 committed by Jens Axboe
parent 974a51a245
commit 093c959307
1 changed files with 3 additions and 2 deletions
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5
drivers/block/mtip32xx/mtip32xx.c
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@ -3864,7 +3864,7 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
struct driver_data *dd = queue->queuedata;
struct scatterlist *sg;
struct bio_vec *bvec;
int nents = 0;
int i, nents = 0;
int tag = 0, unaligned = 0;
if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
@ -3922,11 +3922,12 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
}
/* Create the scatter list for this bio. */
bio_for_each_segment(bvec, bio, nents) {
bio_for_each_segment(bvec, bio, i) {
sg_set_page(&sg[nents],
bvec->bv_page,
bvec->bv_len,
bvec->bv_offset);
nents++;
}
/* Issue the read/write. */