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| author |   Albert Lee <albertcc@tw.ibm.com> | 2005-06-06 15:56:03 +0800 |
|---|---|---|
| committer |   Jeff Garzik <jgarzik@pobox.com> | 2005-06-09 03:14:59 -0400 |
| commit | 6952df035509717bdc46194b2a3d6ffb9349f267 (patch) | |
| tree | bf8709691e303a533e5798c4c7c5a17c9d752fed /drivers/scsi | |
| parent | [PATCH] sata_sil: Fix FIFO PCI Bus Arbitration kernel oops (diff) | |
| download | linux-dev-6952df035509717bdc46194b2a3d6ffb9349f267.tar.xz linux-dev-6952df035509717bdc46194b2a3d6ffb9349f267.zip | |
[PATCH] sg traverse fix for __atapi_pio_bytes()
Problem:
Incorrect md5sum when using ATAPI PIO mode to verify a distro CD.
Root cause: sg traverse problem.
In __atapi_pio_bytes(), if qc->cursg++ is increased and "goto
next_page" is executed, then sg is not updated to the new qc->cursg
and the old sg is overwritten with the new data.
Changes:
- Replace "goto next_page" with "goto next_sg" to make sg updated.
Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/libata-core.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index 21d194c6ace3..9e58f134f68b 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -2577,7 +2577,6 @@ static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes) next_sg: sg = &qc->sg[qc->cursg]; -next_page: page = sg->page; offset = sg->offset + qc->cursg_ofs; @@ -2585,6 +2584,7 @@ next_page: page = nth_page(page, (offset >> PAGE_SHIFT)); offset %= PAGE_SIZE; + /* don't overrun current sg */ count = min(sg->length - qc->cursg_ofs, bytes); /* don't cross page boundaries */ @@ -2609,8 +2609,6 @@ next_page: kunmap(page); if (bytes) { - if (qc->cursg_ofs < sg->length) - goto next_page; goto next_sg; } } |