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Drivers: hv: vmbus: Replace smp_store_mb() with virt_store_mb()

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commit eaa03d3453 upstream.

Following the recommendation in Documentation/memory-barriers.txt for
virtual machine guests.

Fixes: 8b6a877c06 ("Drivers: hv: vmbus: Replace the per-CPU channel lists with a global array of channels")
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20220328154457.100872-1-parri.andrea@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrea Parri (Microsoft)
2022-03-28 17:44:57 +02:00
committed by Greg Kroah-Hartman
parent e1f540b752
commit 000e09462f
1 changed files with 3 additions and 3 deletions
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drivers/hv/channel_mgmt.c
+3 -3
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@@ -350,7 +350,7 @@ void vmbus_channel_map_relid(struct vmbus_channel *channel)
* execute: * execute:
* *
* (a) In the "normal (i.e., not resuming from hibernation)" path, * (a) In the "normal (i.e., not resuming from hibernation)" path,
* the full barrier in smp_store_mb() guarantees that the store * the full barrier in virt_store_mb() guarantees that the store
* is propagated to all CPUs before the add_channel_work work * is propagated to all CPUs before the add_channel_work work
* is queued. In turn, add_channel_work is queued before the * is queued. In turn, add_channel_work is queued before the
* channel's ring buffer is allocated/initialized and the * channel's ring buffer is allocated/initialized and the
@@ -362,14 +362,14 @@ void vmbus_channel_map_relid(struct vmbus_channel *channel)
* recv_int_page before retrieving the channel pointer from the * recv_int_page before retrieving the channel pointer from the
* array of channels. * array of channels.
* *
* (b) In the "resuming from hibernation" path, the smp_store_mb() * (b) In the "resuming from hibernation" path, the virt_store_mb()
* guarantees that the store is propagated to all CPUs before * guarantees that the store is propagated to all CPUs before
* the VMBus connection is marked as ready for the resume event * the VMBus connection is marked as ready for the resume event
* (cf. check_ready_for_resume_event()). The interrupt handler * (cf. check_ready_for_resume_event()). The interrupt handler
* of the VMBus driver and vmbus_chan_sched() can not run before * of the VMBus driver and vmbus_chan_sched() can not run before
* vmbus_bus_resume() has completed execution (cf. resume_noirq). * vmbus_bus_resume() has completed execution (cf. resume_noirq).
*/ */
smp_store_mb( virt_store_mb(
vmbus_connection.channels[channel->offermsg.child_relid], vmbus_connection.channels[channel->offermsg.child_relid],
channel); channel);
} }