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authorK. Y. Srinivasan <kys@microsoft.com>2014-08-28 18:29:53 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-23 23:31:21 -0700
commit2115b5617adf2eecca49e78f3810f359ddc5c396 (patch)
tree78deae37a3debee67b4cd30b54d948ad3cc1c8ab /drivers/hv/channel_mgmt.c
parentb29ef3546aecb253a5552b198cef23750d56e1e4 (diff)
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>
Diffstat (limited to 'drivers/hv/channel_mgmt.c')
-rw-r--r--drivers/hv/channel_mgmt.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index ed9350d42764..a2d1a9612c86 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -224,11 +224,14 @@ static void vmbus_process_rescind_offer(struct work_struct *work)
msg.header.msgtype = CHANNELMSG_RELID_RELEASED;
vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released));
- if (channel->target_cpu != smp_processor_id())
+ if (channel->target_cpu != get_cpu()) {
+ put_cpu();
smp_call_function_single(channel->target_cpu,
percpu_channel_deq, channel, true);
- else
+ } else {
percpu_channel_deq(channel);
+ put_cpu();
+ }
if (channel->primary_channel == NULL) {
spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
@@ -294,12 +297,15 @@ static void vmbus_process_offer(struct work_struct *work)
spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
if (enq) {
- if (newchannel->target_cpu != smp_processor_id())
+ if (newchannel->target_cpu != get_cpu()) {
+ put_cpu();
smp_call_function_single(newchannel->target_cpu,
percpu_channel_enq,
newchannel, true);
- else
+ } else {
percpu_channel_enq(newchannel);
+ put_cpu();
+ }
}
if (!fnew) {
/*
@@ -314,12 +320,15 @@ static void vmbus_process_offer(struct work_struct *work)
list_add_tail(&newchannel->sc_list, &channel->sc_list);
spin_unlock_irqrestore(&channel->sc_lock, flags);
- if (newchannel->target_cpu != smp_processor_id())
+ if (newchannel->target_cpu != get_cpu()) {
+ put_cpu();
smp_call_function_single(newchannel->target_cpu,
percpu_channel_enq,
newchannel, true);
- else
+ } else {
percpu_channel_enq(newchannel);
+ put_cpu();
+ }
newchannel->state = CHANNEL_OPEN_STATE;
if (channel->sc_creation_callback != NULL)