> On Jan 9, 2017, at 1:42 AM, Yuval Shaia <yuval.shaia@xxxxxxxxxx> wrote:
>
> On Mon, Jan 09, 2017 at 04:00:44PM +0530, Sriharsha Basavapatna wrote:
>> 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")
>> Cc: stable@xxxxxxxxxxxxxxx
>> Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@xxxxxxxxxxxx>
>> Reviewed-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
>> ---
>> net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 2 --
>> 1 file changed, 2 deletions(-)
>>
>> diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
>> index 57d35fbb1c28..172b537f8cfc 100644
>> --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
>> +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
>> @@ -347,8 +347,6 @@ 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;
>
> Reviewed-by: Yuval Shaia <yuval.shaia@xxxxxxxxxx>
Hi Bruce-
Is it possible to take this in v4.10-rc ?
--
Chuck Lever
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