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hyperv/vmbus: Don't close unopened channels.

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MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8566
This commit is contained in:
Sepherosa Ziehau 2016-11-25 06:12:18 +00:00
parent ba9238f89f
commit fd2b520f2f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=309132
1 changed files with 20 additions and 2 deletions
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22
sys/dev/hyperv/vmbus/vmbus_chan.c
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@ -688,10 +688,28 @@ vmbus_chan_close_internal(struct vmbus_channel *chan)
struct vmbus_softc *sc = chan->ch_vmbus;
struct vmbus_msghc *mh;
struct vmbus_chanmsg_chclose *req;
uint32_t old_stflags;
int error;
/* TODO: stringent check */
atomic_clear_int(&chan->ch_stflags, VMBUS_CHAN_ST_OPENED);
/*
* NOTE:
* Sub-channels are closed upon their primary channel closing,
* so they can be closed even before they are opened.
*/
for (;;) {
old_stflags = chan->ch_stflags;
if (atomic_cmpset_int(&chan->ch_stflags, old_stflags,
old_stflags & ~VMBUS_CHAN_ST_OPENED))
break;
}
if ((old_stflags & VMBUS_CHAN_ST_OPENED) == 0) {
/* Not opened yet; done */
if (bootverbose) {
vmbus_chan_printf(chan, "chan%u not opened\n",
chan->ch_id);
}
return;
}
/*
* Free this channel's sysctl tree attached to its device's