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| author | Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com> | 2017-01-09 13:30:44 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-26 10:23:48 +0300 |
| commit | 294b0aadc8c286073b951e2fce7e79bbb0230640 (patch) | |
| tree | 352abc2a35fcf8a591f981498572103a20aa09b6 /net/sunrpc/xprtrdma | |
| parent | 098b62b757a4303f576a6d2bb8f11d0ad93797d1 (diff) | |
| download | linux-294b0aadc8c286073b951e2fce7e79bbb0230640.tar.xz | |
svcrdma: avoid duplicate dma unmapping during error recovery
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@broadcom.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/sunrpc/xprtrdma')
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c index ff4f01e527ec..d4e0d648bcea 100644 --- 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_rdma *xprt, 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; |