drbd: protect updates to integrits_tfm by tconn->data->mutex
Since we need to hold that mutex anyways to make sure the peer
gets that change in the right position in the data stream,
it makes a lot of sense to use the same mutex to ensure existence
of the tfm.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index e167228..c59012f 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -848,7 +848,7 @@
struct list_head out_of_sequence_requests;
struct crypto_hash *cram_hmac_tfm;
- struct crypto_hash *integrity_tfm; /* checksums we compute */
+ struct crypto_hash *integrity_tfm; /* checksums we compute, updates protected by tconn->data->mutex */
struct crypto_hash *peer_integrity_tfm; /* checksums we verify */
struct crypto_hash *csums_tfm;
struct crypto_hash *verify_tfm;