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| author | K. Y. Srinivasan <kys@microsoft.com> | 2014-08-28 01:25:33 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-24 08:30:38 +0200 |
| commit | 98d731bb064a9d1817a6ca9bf8b97051334a7cfe (patch) | |
| tree | e533c8a76a30911c6feb9e4ba04d8a51edb98fed /drivers/hv/channel.c | |
| parent | Drivers: hv: vmbus: Fix a bug in vmbus_open() (diff) | |
| download | linux-98d731bb064a9d1817a6ca9bf8b97051334a7cfe.tar.xz linux-98d731bb064a9d1817a6ca9bf8b97051334a7cfe.zip | |
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/channel.c')
| -rw-r--r-- | drivers/hv/channel.c | 29 |
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; } /* |