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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>
This commit is contained in:
FUJITA Tomonori 2007-08-18 18:27:36 +09:00 committed by Jens Axboe
parent f1346372f9
commit 0874ee76bc
1 changed files with 6 additions and 1 deletions
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7
drivers/ata/libata-core.c
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@ -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); int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
struct scatterlist *sg = qc->__sg; struct scatterlist *sg = qc->__sg;
struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
struct ata_port *ap = qc->ap; struct ata_port *ap = qc->ap;
struct page *page; struct page *page;
unsigned char *buf; unsigned char *buf;
unsigned int offset, count; unsigned int offset, count;
int no_more_sg = 0;
if (qc->curbytes + bytes >= qc->nbytes) if (qc->curbytes + bytes >= qc->nbytes)
ap->hsm_task_state = HSM_ST_LAST; ap->hsm_task_state = HSM_ST_LAST;
next_sg: 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 * The end of qc->sg is reached and the device expects
* more data to transfer. In order not to overrun qc->sg * more data to transfer. In order not to overrun qc->sg
@ -5023,6 +5025,9 @@ next_sg:
qc->cursg_ofs += count; qc->cursg_ofs += count;
if (qc->cursg_ofs == sg->length) { if (qc->cursg_ofs == sg->length) {
if (qc->cursg == lsg)
no_more_sg = 1;
qc->cursg = sg_next(qc->cursg); qc->cursg = sg_next(qc->cursg);
qc->cursg_ofs = 0; qc->cursg_ofs = 0;
} }