hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[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>
This commit is contained in:
Albert Lee 2005-06-06 15:56:03 +08:00 committed by Jeff Garzik
parent e1dd23a001
commit 6952df0355
1 changed files with 1 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/scsi/libata-core.c
View File

@ -2577,7 +2577,6 @@ static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
next_sg: next_sg:
sg = &qc->sg[qc->cursg]; sg = &qc->sg[qc->cursg];
next_page:
page = sg->page; page = sg->page;
offset = sg->offset + qc->cursg_ofs; offset = sg->offset + qc->cursg_ofs;
@ -2585,6 +2584,7 @@ next_page:
page = nth_page(page, (offset >> PAGE_SHIFT)); page = nth_page(page, (offset >> PAGE_SHIFT));
offset %= PAGE_SIZE; offset %= PAGE_SIZE;
/* don't overrun current sg */
count = min(sg->length - qc->cursg_ofs, bytes); count = min(sg->length - qc->cursg_ofs, bytes);
/* don't cross page boundaries */ /* don't cross page boundaries */
@ -2609,8 +2609,6 @@ next_page:
kunmap(page); kunmap(page);
if (bytes) { if (bytes) {
if (qc->cursg_ofs < sg->length)
goto next_page;
goto next_sg; goto next_sg;
} }
} }