-stable review patch. If anyone has any objections, please let us know.
------------------
From: Michael S. Tsirkin <[email protected]>
In mthca_arbel_fmr_unmap(), the high bits of the key are masked off.
This gets rid of the effect of adjust_key(), which makes sure that
bits 3 and 23 of the key are equal when the Sinai throughput
optimization is enabled, and so it may happen that an FMR will end up
with bits 3 and 23 in the key being different. This causes data
corruption, because when enabling the throughput optimization, the
driver promises the HCA firmware that bits 3 and 23 of all memory keys
will always be equal.
Fix by re-applying adjust_key() after masking the key.
Thanks to Or Gerlitz for reproducing the problem, and Ariel Shahar for
help in debug.
Signed-off-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/infiniband/hw/mthca/mthca_mr.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/infiniband/hw/mthca/mthca_mr.c
+++ b/drivers/infiniband/hw/mthca/mthca_mr.c
@@ -751,6 +751,7 @@ void mthca_arbel_fmr_unmap(struct mthca_
key = arbel_key_to_hw_index(fmr->ibmr.lkey);
key &= dev->limits.num_mpts - 1;
+ key = adjust_key(dev, key);
fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);
fmr->maps = 0;
--
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