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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2007-08-18 18:27:36 +0900 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 11:21:01 +0200 |
| commit | 0874ee76bcd06e2f53c32a56773ad82f5920f0f9 (patch) | |
| tree | d38285f71ba3daaacf516b6dc3b98ccf2147d7e6 /drivers/ata/libata-core.c | |
| parent | f1346372f9c73154727bf2cadb7f78126597efd2 (diff) | |
| download | lwn-0874ee76bcd06e2f53c32a56773ad82f5920f0f9.tar.gz lwn-0874ee76bcd06e2f53c32a56773ad82f5920f0f9.zip | |
libata sg chaining support fix
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/ata/libata-core.c')
| -rw-r--r-- | drivers/ata/libata-core.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index e52c33180e42..bbaa545ea999 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4952,16 +4952,18 @@ static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes) { int do_write = (qc->tf.flags & ATA_TFLAG_WRITE); struct scatterlist *sg = qc->__sg; + struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem); struct ata_port *ap = qc->ap; struct page *page; unsigned char *buf; unsigned int offset, count; + int no_more_sg = 0; if (qc->curbytes + bytes >= qc->nbytes) ap->hsm_task_state = HSM_ST_LAST; next_sg: - if (unlikely(qc->cursg == sg_last(qc->__sg, qc->n_elem))) { + if (unlikely(no_more_sg)) { /* * The end of qc->sg is reached and the device expects * more data to transfer. In order not to overrun qc->sg @@ -5023,6 +5025,9 @@ next_sg: qc->cursg_ofs += count; if (qc->cursg_ofs == sg->length) { + if (qc->cursg == lsg) + no_more_sg = 1; + qc->cursg = sg_next(qc->cursg); qc->cursg_ofs = 0; } |