This is a note to let you know that I've just added the patch titled
sunvdc: limit each sg segment to a page
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sunvdc-limit-each-sg-segment-to-a-page.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Nov 18 09:08:30 PST 2014
From: Dwight Engen <dwight.engen@xxxxxxxxxx>
Date: Fri, 19 Sep 2014 09:42:53 -0400
Subject: sunvdc: limit each sg segment to a page
From: Dwight Engen <dwight.engen@xxxxxxxxxx>
[ Upstream commit 5eed69ffd248c9f68f56c710caf07db134aef28b ]
ldc_map_sg() could fail its check that the number of pages referred to
by the sg scatterlist was <= the number of cookies.
This fixes the issue by doing a similar thing to the xen-blkfront driver,
ensuring that the scatterlist will only ever contain a segment count <=
port->ring_cookies, and each segment will be page aligned, and <= page
size. This ensures that the scatterlist is always mappable.
Orabug: 19347817
OraBZ: 15945
Signed-off-by: Dwight Engen <dwight.engen@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/sunvdc.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -747,6 +747,10 @@ static int probe_disk(struct vdc_port *p
port->disk = g;
+ /* Each segment in a request is up to an aligned page in size. */
+ blk_queue_segment_boundary(q, PAGE_SIZE - 1);
+ blk_queue_max_segment_size(q, PAGE_SIZE);
+
blk_queue_max_segments(q, port->ring_cookies);
blk_queue_max_hw_sectors(q, port->max_xfer_size);
g->major = vdc_major;
Patches currently in stable-queue which might be from dwight.engen@xxxxxxxxxx are
queue-3.17/vio-fix-reuse-of-vio_dring-slot.patch
queue-3.17/sunvdc-compute-vdisk-geometry-from-capacity.patch
queue-3.17/sunvdc-add-cdrom-and-v1.1-protocol-support.patch
queue-3.17/sunvdc-don-t-call-vd_op_get_vtoc.patch
queue-3.17/sunvdc-limit-each-sg-segment-to-a-page.patch
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