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[IB] mthca: Avoid SRQ free WQE list corruption

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Fix wqe_to_link() to use a structure field that we know is definitely
always unused for receive work requests, so that it really avoids the
free list corruption bug that the comment claims it does.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2005-10-30 13:07:03 -08:00
parent 7162a3e0db
commit e5b251a24a
1 changed files with 7 additions and 6 deletions
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13
drivers/infiniband/hw/mthca/mthca_srq.c
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@ -75,15 +75,16 @@ static void *get_wqe(struct mthca_srq *srq, int n)
/* /*
* Return a pointer to the location within a WQE that we're using as a * Return a pointer to the location within a WQE that we're using as a
* link when the WQE is in the free list. We use an offset of 4 * link when the WQE is in the free list. We use the imm field
* because in the Tavor case, posting a WQE may overwrite the first * because in the Tavor case, posting a WQE may overwrite the next
* four bytes of the previous WQE. The offset avoids corrupting our * segment of the previous WQE, but a receive WQE will never touch the
* free list if the WQE has already completed and been put on the free * imm field. This avoids corrupting our free list if the previous
* list when we post the next WQE. * WQE has already completed and been put on the free list when we
* post the next WQE.
*/ */
static inline int *wqe_to_link(void *wqe) static inline int *wqe_to_link(void *wqe)
{ {
return (int *) (wqe + 4); return (int *) (wqe + offsetof(struct mthca_next_seg, imm));
} }
static void mthca_tavor_init_srq_context(struct mthca_dev *dev, static void mthca_tavor_init_srq_context(struct mthca_dev *dev,