Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0874ee76bcd06e2f53c32a56773ad82f5920f0f9
Commit: 0874ee76bcd06e2f53c32a56773ad82f5920f0f9
Parent: f1346372f9c73154727bf2cadb7f78126597efd2
Author: FUJITA Tomonori <[EMAIL PROTECTED]>
AuthorDate: Sat Aug 18 18:27:36 2007 +0900
Committer: Jens Axboe <[EMAIL PROTECTED]>
CommitDate: Tue Oct 16 11:21:01 2007 +0200
libata sg chaining support fix
Signed-off-by: FUJITA Tomonori <[EMAIL PROTECTED]>
Signed-off-by: Jens Axboe <[EMAIL PROTECTED]>
---
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 e52c331..bbaa545 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;
}
-
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