linux-kernel - Re: IDE crash...

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Date:	Tue, 23 Oct 2007 09:23:59 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	David Miller <davem@...emloft.net>
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org
Subject: Re: IDE crash...

On Tue, Oct 23 2007, David Miller wrote:
> From: Jens Axboe <jens.axboe@...cle.com>
> Date: Tue, 23 Oct 2007 09:09:33 +0200
> 
> > Eh this wont work, it's the wrong entry... Here's a temporary
> > work-around.
> > 
> > diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
> > index c89f0d3..108202b 100644
> > --- a/drivers/ide/ide-io.c
> > +++ b/drivers/ide/ide-io.c
> > @@ -822,6 +822,7 @@ void ide_map_sg(ide_drive_t *drive, struct request *rq)
> >  		return;
> >  
> >  	if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) {
> > +		sg_init_table(hwif->sg_table, hwif->sg_max_nents);
> >  		hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
> >  	} else {
> >  		sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
> 
> That's the exact patch I'm about to boot test :-)

That should work - once you verify that, would you mind testing this one
as well? Thanks!

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 61c2e39..290836f 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1352,7 +1352,7 @@ new_segment:
 			if (!sg)
 				sg = sglist;
 			else
-				sg = sg_next(sg);
+				sg = sg_next_force(sg);
 
 			sg_dma_len(sg) = 0;
 			sg_dma_address(sg) = 0;
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 42daf5e..a98a2ee 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -99,6 +99,22 @@ static inline struct scatterlist *sg_next(struct scatterlist *sg)
 	return sg;
 }
 
+/**
+ * sg_next_force - return the next scatterlist entry in a list
+ * @sg:		   The current sg entry
+ *
+ * Description:
+ *   Must only be used when more entries beyond this one is known to exist,
+ *   as it clears the termination bit. Useful to avoid adding a full sg
+ *   table init on every mapping.
+ *
+ **/
+static inline struct scatterlist *sg_next_force(struct scatterlist *sg)
+{
+	sg->page_link &= ~0x02;
+	return sg_next(sg);
+}
+
 /*
  * Loop over each sg element, following the pointer to a new list if necessary
  */

-- 
Jens Axboe

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