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[IB/mthca]: Fix error CQ entry handling on mem-free HCAs

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Fix handling of error CQ entries on mem-free HCAs: the doorbell count
is never valid so we shouldn't look at it.  This fixes problems exposed
by new HCA firmware.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2005-07-27 14:38:49 -07:00
parent 9e566d8bd6
commit 42b1806d5c
1 changed files with 5 additions and 1 deletions
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6
drivers/infiniband/hw/mthca/mthca_cq.c
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@ -373,8 +373,12 @@ static int handle_error_cqe(struct mthca_dev *dev, struct mthca_cq *cq,
* If we're at the end of the WQE chain, or we've used up our * If we're at the end of the WQE chain, or we've used up our
* doorbell count, free the CQE. Otherwise just update it for * doorbell count, free the CQE. Otherwise just update it for
* the next poll operation. * the next poll operation.
*
* This does not apply to mem-free HCAs: they don't use the
* doorbell count field, and so we should always free the CQE.
*/ */
if (!(new_wqe & cpu_to_be32(0x3f)) || (!cqe->db_cnt && dbd)) if (mthca_is_memfree(dev) ||
!(new_wqe & cpu_to_be32(0x3f)) || (!cqe->db_cnt && dbd))
return 0; return 0;
cqe->db_cnt = cpu_to_be16(be16_to_cpu(cqe->db_cnt) - dbd); cqe->db_cnt = cpu_to_be16(be16_to_cpu(cqe->db_cnt) - dbd);