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libata sg chaining support fix

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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);
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 @@ static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
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;
}