This is a note to let you know that I've just added the patch titled
svcrdma: avoid duplicate dma unmapping during error recovery
to the 4.4-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:
svcrdma-avoid-duplicate-dma-unmapping-during-error-recovery.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ce1ca7d2d140a1f4aaffd297ac487f246963dd2f Mon Sep 17 00:00:00 2001
From: Sriharsha Basavapatna <sriharsha.basavapatna@xxxxxxxxxxxx>
Date: Mon, 9 Jan 2017 16:00:44 +0530
Subject: svcrdma: avoid duplicate dma unmapping during error recovery
From: Sriharsha Basavapatna <sriharsha.basavapatna@xxxxxxxxxxxx>
commit ce1ca7d2d140a1f4aaffd297ac487f246963dd2f upstream.
In rdma_read_chunk_frmr() when ib_post_send() fails, the error code path
invokes ib_dma_unmap_sg() to unmap the sg list. It then invokes
svc_rdma_put_frmr() which in turn tries to unmap the same sg list through
ib_dma_unmap_sg() again. This second unmap is invalid and could lead to
problems when the iova being unmapped is subsequently reused. Remove
the call to unmap in rdma_read_chunk_frmr() and let svc_rdma_put_frmr()
handle it.
Fixes: 412a15c0fe53 ("svcrdma: Port to new memory registration API")
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@xxxxxxxxxxxx>
Reviewed-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Reviewed-by: Yuval Shaia <yuval.shaia@xxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 2 --
1 file changed, 2 deletions(-)
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -346,8 +346,6 @@ int rdma_read_chunk_frmr(struct svcxprt_
atomic_inc(&rdma_stat_read);
return ret;
err:
- ib_dma_unmap_sg(xprt->sc_cm_id->device,
- frmr->sg, frmr->sg_nents, frmr->direction);
svc_rdma_put_context(ctxt, 0);
svc_rdma_put_frmr(xprt, frmr);
return ret;
Patches currently in stable-queue which might be from sriharsha.basavapatna@xxxxxxxxxxxx are
queue-4.4/svcrdma-avoid-duplicate-dma-unmapping-during-error-recovery.patch
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