diff options
| author | K. Y. Srinivasan <kys@microsoft.com> | 2016-11-06 13:14:18 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-14 15:25:38 -0800 |
| commit | 964dfbe3dd2d36f9d35018568e303d9847fc1026 (patch) | |
| tree | 862152fd482bd6d2c95a3f5debae8ed108eda78f /include | |
| parent | e2fdf7841cb32128685ddcd6db7a51d0e3c3c739 (diff) | |
Drivers: hv: vmbus: On the read path cleanup the logic to interrupt the host
commit 3372592a140db69fd63837e81f048ab4abf8111e upstream.
Signal the host when we determine the host is to be signaled -
on th read path. The currrent code determines the need to signal in the
ringbuffer code and actually issues the signal elsewhere. This can result
in the host viewing this interrupt as spurious since the host may also
poll the channel. Make the necessary adjustments.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: Rolf Neugebauer <rolf.neugebauer@docker.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hyperv.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 159b5351b3e9..33719c515f1a 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1480,10 +1480,11 @@ hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info) * there is room for the producer to send the pending packet. */ -static inline bool hv_need_to_signal_on_read(struct hv_ring_buffer_info *rbi) +static inline void hv_signal_on_read(struct vmbus_channel *channel) { u32 cur_write_sz; u32 pending_sz; + struct hv_ring_buffer_info *rbi = &channel->inbound; /* * Issue a full memory barrier before making the signaling decision. @@ -1501,14 +1502,14 @@ static inline bool hv_need_to_signal_on_read(struct hv_ring_buffer_info *rbi) pending_sz = READ_ONCE(rbi->ring_buffer->pending_send_sz); /* If the other end is not blocked on write don't bother. */ if (pending_sz == 0) - return false; + return; cur_write_sz = hv_get_bytes_to_write(rbi); if (cur_write_sz >= pending_sz) - return true; + vmbus_setevent(channel); - return false; + return; } /* @@ -1590,8 +1591,7 @@ static inline void commit_rd_index(struct vmbus_channel *channel) virt_rmb(); ring_info->ring_buffer->read_index = ring_info->priv_read_index; - if (hv_need_to_signal_on_read(ring_info)) - vmbus_set_event(channel); + hv_signal_on_read(channel); } |