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authorStephen Hemminger <stephen@networkplumber.org>2017-06-25 12:47:46 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-17 15:00:47 +0200
commit6463a4571ceefc43908df4b016d8d5d8b8e85357 (patch)
treef1b08f763e83336500666390db0f5d900cd6a8d7 /drivers/hv
parenteba9718ed25b2f8a3c066bf985edd5046485a018 (diff)
vmbus: re-enable channel tasklet
This problem shows up in 4.11 when netvsc driver is removed and reloaded. The problem is that the channel is closed during module removal and the tasklet for processing responses is disabled. When module is reloaded the channel is reopened but the tasklet is marked as disabled. The fix is to re-enable tasklet at the end of close which gets it back to the initial state. The issue is less urgent in 4.12 since network driver now uses NAPI and not the tasklet; and other VMBUS devices are rarely unloaded/reloaded. Fixes: dad72a1d2844 ("vmbus: remove hv_event_tasklet_disable/enable") Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/channel.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index e9bf0bb87ac4..e57cc40cb768 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -606,6 +606,8 @@ static int vmbus_close_internal(struct vmbus_channel *channel)
get_order(channel->ringbuffer_pagecount * PAGE_SIZE));
out:
+ /* re-enable tasklet for use on re-open */
+ tasklet_enable(&channel->callback_event);
return ret;
}