On Tue, 2008-02-26 at 10:48 +0100, Mike Galbraith wrote:
quoted text
> Greetings,
> 
> I straced both a good and a bad kernel (good being .git with attached
> revert patch applied) and filtered/diffed/merged the output.  Scroll
> down to "HERE" to see the problem (resid).
> 
> I'm poking around, but not having much luck.

Seems the problem is data_len changes, but raw_data_len doesn't.  I've
not the foggiest IO-land clue, but k3b works again, so the below may
have some diagnostic value.

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index ba21d97..7a6f784 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -871,7 +871,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 			scsi_end_bidi_request(cmd);
 			return;
 		}
-		req->data_len = scsi_get_resid(cmd);
+		req->data_len = req->raw_data_len = scsi_get_resid(cmd);
 	}
 
 	BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */

	-Mike

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