diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hv/channel.c | 12 | ||||
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 19 |
2 files changed, 4 insertions, 27 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index bd0d1988feb2..57b2958205c7 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -530,15 +530,13 @@ static int vmbus_close_internal(struct vmbus_channel *channel) int ret; /* - * vmbus_on_event(), running in the tasklet, can race + * vmbus_on_event(), running in the per-channel tasklet, can race * with vmbus_close_internal() in the case of SMP guest, e.g., when * the former is accessing channel->inbound.ring_buffer, the latter - * could be freeing the ring_buffer pages. - * - * To resolve the race, we can serialize them by disabling the - * tasklet when the latter is running here. + * could be freeing the ring_buffer pages, so here we must stop it + * first. */ - hv_event_tasklet_disable(channel); + tasklet_disable(&channel->callback_event); /* * In case a device driver's probe() fails (e.g., @@ -605,8 +603,6 @@ static int vmbus_close_internal(struct vmbus_channel *channel) get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); out: - hv_event_tasklet_enable(channel); - return ret; } diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index d2cfa3eb71a2..bf846d078d85 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -382,19 +382,6 @@ static void vmbus_release_relid(u32 relid) true); } -void hv_event_tasklet_disable(struct vmbus_channel *channel) -{ - tasklet_disable(&channel->callback_event); -} - -void hv_event_tasklet_enable(struct vmbus_channel *channel) -{ - tasklet_enable(&channel->callback_event); - - /* In case there is any pending event */ - tasklet_schedule(&channel->callback_event); -} - void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) { unsigned long flags; @@ -403,7 +390,6 @@ void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) BUG_ON(!channel->rescind); BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex)); - hv_event_tasklet_disable(channel); if (channel->target_cpu != get_cpu()) { put_cpu(); smp_call_function_single(channel->target_cpu, @@ -412,7 +398,6 @@ void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) percpu_channel_deq(channel); put_cpu(); } - hv_event_tasklet_enable(channel); if (channel->primary_channel == NULL) { list_del(&channel->listentry); @@ -506,7 +491,6 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel) init_vp_index(newchannel, dev_type); - hv_event_tasklet_disable(newchannel); if (newchannel->target_cpu != get_cpu()) { put_cpu(); smp_call_function_single(newchannel->target_cpu, @@ -516,7 +500,6 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel) percpu_channel_enq(newchannel); put_cpu(); } - hv_event_tasklet_enable(newchannel); /* * This state is used to indicate a successful open @@ -566,7 +549,6 @@ err_deq_chan: list_del(&newchannel->listentry); mutex_unlock(&vmbus_connection.channel_mutex); - hv_event_tasklet_disable(newchannel); if (newchannel->target_cpu != get_cpu()) { put_cpu(); smp_call_function_single(newchannel->target_cpu, @@ -575,7 +557,6 @@ err_deq_chan: percpu_channel_deq(newchannel); put_cpu(); } - hv_event_tasklet_enable(newchannel); vmbus_release_relid(newchannel->offermsg.child_relid); |