On 5/27/06, Kai Makisara <[email protected]> wrote:
[SNIP]
Next thing was to patch 2.6.16.18 with the patch at the end: No more
oopses with any alignment.
James, does this fix your problem ?
Kai-
I'll try and see if I can test this on Tuesday.
I've been traveling for the last few days.
Thanks for your help!
-- James
Kai
--------------------------------8<------------------------------------------
Excerpt from a message from Brian Holty to linux-scsi and linux-kernel on
Wed, 22 Mar 2006 06:35:39:
...
Based on above, I think the most intuitive fix would be the offset addition of
the first entry to the initialization of nr_pages.
Without this change, for instance, with 4K io's every sg io that is
dma_aligned for direct io, but not page aligned will cause slab corruption
and an oops
I am able to run a number of tests with sg that cause the boundary to be
crossed, and with this fix there is no slab corruption or data corruption.
Thanks Dan, I had been hunting for this for a couple of days!!
Thoughts??
Signed-off-by: Bryan Holty <[email protected]>
--- a/drivers/scsi/scsi_lib.c 2006-03-03 13:17:22.000000000 -0600
+++ b/drivers/scsi/scsi_lib.c 2006-03-22 06:09:09.669599539 -0600
@@ -368,7 +368,7 @@
int nsegs, unsigned bufflen, gfp_t gfp)
{
struct request_queue *q = rq->q;
- int nr_pages = (bufflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
unsigned int data_len = 0, len, bytes, off;
struct page *page;
struct bio *bio = NULL;
-
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