diff options
| author | Chang Huaixin <huaixin.chx@alibaba-inc.com> | 2014-10-16 13:33:24 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2014-10-16 13:37:57 -0700 |
| commit | 4d544e3bdb12f8e48f61e7f2270b253a48c69e00 (patch) | |
| tree | f5fef7fc107d9eefc13afc01c6db9ad50810c57f /drivers/input/misc | |
| parent | b0cfb794a3dd1d699f3e453f9180bd06508fb8f0 (diff) | |
| download | lwn-4d544e3bdb12f8e48f61e7f2270b253a48c69e00.tar.gz lwn-4d544e3bdb12f8e48f61e7f2270b253a48c69e00.zip | |
Input: xen-kbdfront - free grant table entry in xenkbd_disconnect_backend
xenkbd_disconnect_backend doesn't free grant table entry. This bug affects
live migration.
xenkbd_disconnect_backend uses gnttab_end_foreign_access_ref to handle
grant table entry which doesn't really free an entry.
Thus every time we do xenkbd_resume, grant table entry increses by one. As
an grant table entry occupies 8 bytes, an grant table page has at most 512
entries. Every 512 times we do xenkdb_resume, grant table pages increses by
one.
After around 3500 times of live migration, grant table pages will increase
by 7, causing too many pages to populate and hitting max_pages limit when
assigning pages.Thus assign_pages will fail, so will live migration.
Signed-off-by: Chang Huaixin <huaixin.chx@alibaba-inc.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/misc')
| -rw-r--r-- | drivers/input/misc/xen-kbdfront.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c index fbfdc10573be..e2ecfc6e633d 100644 --- a/drivers/input/misc/xen-kbdfront.c +++ b/drivers/input/misc/xen-kbdfront.c @@ -285,7 +285,7 @@ static int xenkbd_connect_backend(struct xenbus_device *dev, error_evtchan: xenbus_free_evtchn(dev, evtchn); error_grant: - gnttab_end_foreign_access_ref(info->gref, 0); + gnttab_end_foreign_access(info->gref, 0, 0UL); info->gref = -1; return ret; } @@ -296,7 +296,7 @@ static void xenkbd_disconnect_backend(struct xenkbd_info *info) unbind_from_irqhandler(info->irq, info); info->irq = -1; if (info->gref >= 0) - gnttab_end_foreign_access_ref(info->gref, 0); + gnttab_end_foreign_access(info->gref, 0, 0UL); info->gref = -1; } |