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authorK. Y. Srinivasan <kys@microsoft.com>2013-07-14 22:38:11 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-16 23:19:19 -0700
commited07ec93e83ec471d365ce084e43ad90fd205903 (patch)
tree13a54d899c895549ea4b58521dbba90debbd284d /drivers/hv
parent84672369ffb98a51d4ddf74c20a23636da3ad615 (diff)
Drivers: hv: balloon: Fix a bug in the hot-add code
As we hot-add 128 MB chunks of memory, we wait to ensure that the memory is onlined before attempting to hot-add the next chunk. If the udev rule for memory hot-add is not executed within the allowed time, we would rollback the state and abort further hot-add. Since the hot-add has succeeded and the only failure is that the memory is not onlined within the allowed time, we should not be rolling back the state. Fix this bug. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: Stable <stable@vger.kernel.org> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/hv_balloon.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 4c605c70ebf9..61b7351df1d4 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -562,7 +562,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
struct hv_hotadd_state *has)
{
int ret = 0;
- int i, nid, t;
+ int i, nid;
unsigned long start_pfn;
unsigned long processed_pfn;
unsigned long total_pfn = pfn_count;
@@ -607,14 +607,11 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
/*
* Wait for the memory block to be onlined.
+ * Since the hot add has succeeded, it is ok to
+ * proceed even if the pages in the hot added region
+ * have not been "onlined" within the allowed time.
*/
- t = wait_for_completion_timeout(&dm_device.ol_waitevent, 5*HZ);
- if (t == 0) {
- pr_info("hot_add memory timedout\n");
- has->ha_end_pfn -= HA_CHUNK;
- has->covered_end_pfn -= processed_pfn;
- break;
- }
+ wait_for_completion_timeout(&dm_device.ol_waitevent, 5*HZ);
}

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