Eliminate calls to BUG_ON() in vmbus_close_internal().
We have chosen to potentially leak memory, than crash the guest
in case of failures.
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
---
drivers/hv/channel.c | 32 +++++++++++++++++++++++++-------
1 files changed, 25 insertions(+), 7 deletions(-)
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 0206314..d6c8ea2 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -479,10 +479,10 @@ static void reset_channel_cb(void *arg)
channel->onchannel_callback = NULL;
}
-static void vmbus_close_internal(struct vmbus_channel *channel)
+static int vmbus_close_internal(struct vmbus_channel *channel)
{
struct vmbus_channel_close_channel *msg;
- int ret;
+ int ret = 0;
channel->state = CHANNEL_OPEN_STATE;
channel->sc_creation_callback = NULL;
@@ -502,11 +502,28 @@ static void vmbus_close_internal(struct vmbus_channel *channel)
ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel));
- BUG_ON(ret != 0);
+ if (ret) {
+ pr_err("Close failed: close post msg return is %d\n", ret);
+ /*
+ * If we failed to post the close msg,
+ * it is perhaps better to leak memory.
+ */
+ goto close_err;
+ }
+
/* Tear down the gpadl for the channel's ring buffer */
- if (channel->ringbuffer_gpadlhandle)
- vmbus_teardown_gpadl(channel,
- channel->ringbuffer_gpadlhandle);
+ if (channel->ringbuffer_gpadlhandle) {
+ ret = vmbus_teardown_gpadl(channel,
+ channel->ringbuffer_gpadlhandle);
+ if (ret) {
+ pr_err("Close failed: teardown gpadl return %d\n", ret);
+ /*
+ * If we failed to teardown gpadl,
+ * it is perhaps better to leak memory.
+ */
+ goto close_err;
+ }
+ }
/* Cleanup the ring buffers for this channel */
hv_ringbuffer_cleanup(&channel->outbound);
@@ -515,7 +532,8 @@ static void vmbus_close_internal(struct vmbus_channel *channel)
free_pages((unsigned long)channel->ringbuffer_pages,
get_order(channel->ringbuffer_pagecount * PAGE_SIZE));
-
+close_err:
+ return ret;
}
/*
--
1.7.4.1
--
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