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Subject[PATCH 07/10] IB/mthca: Don't try to set srq->last for userspace SRQs
Date
From
Subject: [PATCH] IB/mthca: Don't try to set srq->last for userspace SRQs

Userspace SRQs don't have a buffer allocated for them in the kernel, so
it doesn't make sense to set srq->last during initialization. In fact,
this can crash trying to follow a nonexistent buffer pointer.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

drivers/infiniband/hw/mthca/mthca_srq.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

6577ae51cf52f5fb0e4a85e673dd7bf2d0074e3e
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -172,6 +172,8 @@ static int mthca_alloc_srq_buf(struct mt
scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
}

+ srq->last = get_wqe(srq, srq->max - 1);
+
return 0;
}

@@ -263,7 +265,6 @@ int mthca_alloc_srq(struct mthca_dev *de

srq->first_free = 0;
srq->last_free = srq->max - 1;
- srq->last = get_wqe(srq, srq->max - 1);

return 0;

-
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