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| author | Andrea Parri (Microsoft) <parri.andrea@gmail.com> | 2020-06-17 18:46:42 +0200 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2020-06-20 09:16:19 +0000 |
| commit | 775f43facfe89af605d77a9669aa311b5b95cd07 (patch) | |
| tree | 00fce5f64effe18143f8b15da4e2e81f24a1e70b | |
| parent | 21d2052c7afb77e3a600090bb043913042a3102f (diff) | |
| download | linux-stable-775f43facfe89af605d77a9669aa311b5b95cd07.tar.gz linux-stable-775f43facfe89af605d77a9669aa311b5b95cd07.tar.bz2 linux-stable-775f43facfe89af605d77a9669aa311b5b95cd07.zip | |
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". ;-)
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20200617164642.37393-9-parri.andrea@gmail.com
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
| -rw-r--r-- | drivers/hv/channel.c | 6 | ||||
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 1 | ||||
| -rw-r--r-- | include/linux/hyperv.h | 6 |
3 files changed, 1 insertions, 12 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index 8848d1548b3f..3ebda7707e46 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -129,12 +129,8 @@ static int __vmbus_open(struct vmbus_channel *newchannel, send_pages = newchannel->ringbuffer_send_offset; recv_pages = newchannel->ringbuffer_pagecount - send_pages; - spin_lock_irqsave(&newchannel->lock, flags); - if (newchannel->state != CHANNEL_OPEN_STATE) { - spin_unlock_irqrestore(&newchannel->lock, flags); + if (newchannel->state != CHANNEL_OPEN_STATE) return -EINVAL; - } - spin_unlock_irqrestore(&newchannel->lock, flags); newchannel->state = CHANNEL_OPENING_STATE; newchannel->onchannel_callback = onchannelcallback; diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index 92f8bb2077a9..591106cf58fc 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -317,7 +317,6 @@ static struct vmbus_channel *alloc_channel(void) return NULL; spin_lock_init(&channel->sched_lock); - spin_lock_init(&channel->lock); init_completion(&channel->rescind_event); INIT_LIST_HEAD(&channel->sc_list); diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 690394b79d72..38100e80360a 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -841,12 +841,6 @@ struct vmbus_channel { void (*chn_rescind_callback)(struct vmbus_channel *channel); /* - * The spinlock to protect the structure. It is being used to protect - * test-and-set access to various attributes of the structure as well - * as all sc_list operations. - */ - spinlock_t lock; - /* * All Sub-channels of a primary channel are linked here. */ struct list_head sc_list; |