xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Drivers: hv: vmbus: Fix bugs in rescind handling

Browse Source 
This patch addresses the following bugs in the current rescind handling code:

1. Fixes a race condition where we may be invoking hv_process_channel_removal()
on an already freed channel.

2. Prevents indefinite wait when rescinding sub-channels by correctly setting
the probe_complete state.

I would like to thank Dexuan for patiently reviewing earlier versions of this
patch and identifying many of the issues fixed here.

Greg, please apply this to 4.14-final.

Fixes: '54a66265d675 ("Drivers: hv: vmbus: Fix rescind handling")'

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Cc: stable@vger.kernel.org # (4.13 and above)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan
2017-09-29 21:09:36 -07:00
committed by Greg Kroah-Hartman
parent 688cb67839
commit 192b2d7872
4 changed files with 23 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/hv/channel.c
View File

@@ -640,6 +640,7 @@ void vmbus_close(struct vmbus_channel *channel)
*/
return;
}
mutex_lock(&vmbus_connection.channel_mutex);
/*
* Close all the sub-channels first and then close the
* primary channel.
@@ -648,16 +649,15 @@ void vmbus_close(struct vmbus_channel *channel)
cur_channel = list_entry(cur, struct vmbus_channel, sc_list);
vmbus_close_internal(cur_channel);
if (cur_channel->rescind) {
mutex_lock(&vmbus_connection.channel_mutex);
hv_process_channel_removal(cur_channel,
hv_process_channel_removal(
cur_channel->offermsg.child_relid);
mutex_unlock(&vmbus_connection.channel_mutex);
}
}
/*
* Now close the primary.
*/
vmbus_close_internal(channel);
mutex_unlock(&vmbus_connection.channel_mutex);
}
EXPORT_SYMBOL_GPL(vmbus_close);