Defensive clean up. Don't set frwr->fr_mr until we know that the
scatterlist allocation has succeeded.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
net/sunrpc/xprtrdma/frwr_ops.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index 35c8f62..6a56105 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -155,36 +155,39 @@ void frwr_release_mr(struct rpcrdma_mr *mr)
int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
{
unsigned int depth = ia->ri_max_frwr_depth;
- struct rpcrdma_frwr *frwr = &mr->frwr;
+ struct scatterlist *sg;
+ struct ib_mr *frmr;
int rc;
- frwr->fr_mr = ib_alloc_mr(ia->ri_pd, ia->ri_mrtype, depth);
- if (IS_ERR(frwr->fr_mr))
+ frmr = ib_alloc_mr(ia->ri_pd, ia->ri_mrtype, depth);
+ if (IS_ERR(frmr))
goto out_mr_err;
- mr->mr_sg = kcalloc(depth, sizeof(*mr->mr_sg), GFP_KERNEL);
- if (!mr->mr_sg)
+ sg = kcalloc(depth, sizeof(*sg), GFP_KERNEL);
+ if (!sg)
goto out_list_err;
- frwr->fr_state = FRWR_IS_INVALID;
+ mr->frwr.fr_mr = frmr;
+ mr->frwr.fr_state = FRWR_IS_INVALID;
mr->mr_dir = DMA_NONE;
INIT_LIST_HEAD(&mr->mr_list);
INIT_WORK(&mr->mr_recycle, frwr_mr_recycle_worker);
- sg_init_table(mr->mr_sg, depth);
- init_completion(&frwr->fr_linv_done);
+ init_completion(&mr->frwr.fr_linv_done);
+
+ sg_init_table(sg, depth);
+ mr->mr_sg = sg;
return 0;
out_mr_err:
- rc = PTR_ERR(frwr->fr_mr);
+ rc = PTR_ERR(frmr);
trace_xprtrdma_frwr_alloc(mr, rc);
return rc;
out_list_err:
- rc = -ENOMEM;
dprintk("RPC: %s: sg allocation failure\n",
__func__);
- ib_dereg_mr(frwr->fr_mr);
- return rc;
+ ib_dereg_mr(frmr);
+ return -ENOMEM;
}
/**
