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authorK. Y. Srinivasan <kys@microsoft.com>2014-08-28 03:25:33 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-24 10:30:38 +0400
commit98d731bb064a9d1817a6ca9bf8b97051334a7cfe (patch)
treee533c8a76a30911c6feb9e4ba04d8a51edb98fed /drivers/hv
parent45d727cee9e200f5b351528b9fb063b69cf702c8 (diff)
downloadlinux-98d731bb064a9d1817a6ca9bf8b97051334a7cfe.tar.xz
Drivers: hv: vmbus: Cleanup vmbus_close_internal()
Eliminate calls to BUG_ON() in vmbus_close_internal(). We have chosen to potentially leak memory, than crash the guest in case of failures. In this version of the patch I have addressed comments from Dan Carpenter (dan.carpenter@oracle.com). Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: <stable@vger.kernel.org> Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/channel.c29
1 files changed, 23 insertions, 6 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index b4eebe34ca91..19bad59073e6 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -478,7 +478,7 @@ 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;
@@ -501,11 +501,28 @@ 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.
+ */
+ return ret;
+ }
+
/* 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.
+ */
+ return ret;
+ }
+ }
/* Cleanup the ring buffers for this channel */
hv_ringbuffer_cleanup(&channel->outbound);
@@ -514,7 +531,7 @@ static void vmbus_close_internal(struct vmbus_channel *channel)
free_pages((unsigned long)channel->ringbuffer_pages,
get_order(channel->ringbuffer_pagecount * PAGE_SIZE));
-
+ return ret;
}
/*