Drivers: hv: vmbus: Remove the lock field from the vmbus_channel struct

The spinlock is (now) *not used to protect test-and-set accesses to attributes of the structure or sc_list operations. There is, AFAICT, a distinct lack of {WRITE,READ}_ONCE()s in the handling of channel->state, but the changes below do not seem to make things "worse". ;-)

Andrea Parri (Microsoft) committed 6 years ago

Commit 775f43f1 parent 21d20523 files · +1 −12Browse files

Showing the changes to include/linux (1 of 3 files). Show all

Unified · Split

include/linux/hyperv.h+0−6

@@ -840,12 +840,6 @@ struct vmbus_channel { · 839 unmodified lines
840	840	*/
841	841	void (chn_rescind_callback)(struct vmbus_channel channel);
842	842
843		− /*
844		− * The spinlock to protect the structure. It is being used to protect
845		− * test-and-set access to various attributes of the structure as well
846		− * as all sc_list operations.
847		− */
848		− spinlock_t lock;
849	843	/*
850	844	* All Sub-channels of a primary channel are linked here.
851	845	*/