Drivers: hv: vmbus: Properly protect calls to smp_processor_id()
Disable preemption when sampling current processor ID when preemption
is otherwise possible.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 19bad59..433f72a 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -486,11 +486,14 @@
channel->state = CHANNEL_OPEN_STATE;
channel->sc_creation_callback = NULL;
/* Stop callback and cancel the timer asap */
- if (channel->target_cpu != smp_processor_id())
+ if (channel->target_cpu != get_cpu()) {
+ put_cpu();
smp_call_function_single(channel->target_cpu, reset_channel_cb,
channel, true);
- else
+ } else {
reset_channel_cb(channel);
+ put_cpu();
+ }
/* Send a closing message */