IB/cxgb3: Fix error codes in iwch_alloc_mr()

commit 9064d6055c14f700aa13f7c72fd3e63d12bee643 upstream.

We accidentally don't set the error code on some error paths.  It means
return ERR_PTR(0) which is NULL and results in a NULL dereference in the
caller.

Fixes: 13a239330abd ("RDMA/cxgb3: Don't ignore insert_handle() failures")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
[bwh: Backported to 3.2: drop inapplicable hunk]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index 37c224fc3ad9b8f31e0886507fc43f543ee547b0..35fa4e74b8240ed10e3066f857e34fca147bf805 100644 (file)
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
@@ -795,7 +795,7 @@ static struct ib_mr *iwch_alloc_fast_reg_mr(struct ib_pd *pd, int pbl_depth)
        struct iwch_mr *mhp;
        u32 mmid;
        u32 stag = 0;
-       int ret = 0;
+       int ret = -ENOMEM;
 
        php = to_iwch_pd(pd);
        rhp = php->rhp;
@@ -818,7 +818,8 @@ static struct ib_mr *iwch_alloc_fast_reg_mr(struct ib_pd *pd, int pbl_depth)
        mhp->attr.state = 1;
        mmid = (stag) >> 8;
        mhp->ibmr.rkey = mhp->ibmr.lkey = stag;
-       if (insert_handle(rhp, &rhp->mmidr, mhp, mmid))
+       ret = insert_handle(rhp, &rhp->mmidr, mhp, mmid);
+       if (ret)
                goto err3;
 
        PDBG("%s mmid 0x%x mhp %p stag 0x%x\n", __func__, mmid, mhp, stag);