linux

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Michael Kelley 655296c8bb Drivers: hv: vmbus: Fix ring buffer signaling

Fix bugs in signaling the Hyper-V host when freeing space in the
host->guest ring buffer:

1. The interrupt_mask must not be used to determine whether to signal
   on the host->guest ring buffer
2. The ring buffer write_index must be read (via hv_get_bytes_to_write)
   *after* pending_send_sz is read in order to avoid a race condition
3. Comparisons with pending_send_sz must treat the "equals" case as
   not-enough-space
4. Don't signal if the pending_send_sz feature is not present. Older
   versions of Hyper-V that don't implement this feature will poll.

Fixes: 03bad714a161 ("vmbus: more host signalling avoidance")

Cc: Stable <stable@vger.kernel.org> # 4.14 and above
Signed-off-by: Michael Kelley <mhkelley@outlook.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-03-06 09:52:59 -08:00

channel_mgmt.c

Drivers: hv: vmbus: Fix a rescind issue

2017-11-28 16:56:26 +01:00

channel.c

Drivers: hv: vmbus: Fix a rescind issue

2017-11-28 16:56:26 +01:00

connection.c

hyper-v: trace channel events

2017-11-04 12:04:26 +01:00

hv_balloon.c

Drivers: hv: balloon: Initialize last_post_time on startup