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hyperv/vmbus: Remove unnecessary callback check.

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MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D7046
This commit is contained in:
Sepherosa Ziehau 2016-07-13 06:55:21 +00:00
parent df1021e7bf
commit 817c040c3f
1 changed files with 21 additions and 23 deletions
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44
sys/dev/hyperv/vmbus/hv_channel.c
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@ -861,31 +861,29 @@ VmbusProcessChannelEvent(void* context, int pending)
if (channel->ch_flags & VMBUS_CHAN_FLAG_BATCHREAD)
is_batched_reading = true;
if (channel->on_channel_callback != NULL) {
arg = channel->channel_callback_context;
/*
* Optimize host to guest signaling by ensuring:
* 1. While reading the channel, we disable interrupts from
* host.
* 2. Ensure that we process all posted messages from the host
* before returning from this callback.
* 3. Once we return, enable signaling from the host. Once this
* state is set we check to see if additional packets are
* available to read. In this case we repeat the process.
*/
do {
if (is_batched_reading)
hv_ring_buffer_read_begin(&channel->inbound);
arg = channel->channel_callback_context;
/*
* Optimize host to guest signaling by ensuring:
* 1. While reading the channel, we disable interrupts from
* host.
* 2. Ensure that we process all posted messages from the host
* before returning from this callback.
* 3. Once we return, enable signaling from the host. Once this
* state is set we check to see if additional packets are
* available to read. In this case we repeat the process.
*/
do {
if (is_batched_reading)
hv_ring_buffer_read_begin(&channel->inbound);
channel->on_channel_callback(arg);
channel->on_channel_callback(arg);
if (is_batched_reading)
bytes_to_read =
hv_ring_buffer_read_end(&channel->inbound);
else
bytes_to_read = 0;
} while (is_batched_reading && (bytes_to_read != 0));
}
if (is_batched_reading)
bytes_to_read =
hv_ring_buffer_read_end(&channel->inbound);
else
bytes_to_read = 0;
} while (is_batched_reading && (bytes_to_read != 0));
}
static __inline void