diff options
| author | Juergen Gross <jgross@suse.com> | 2017-05-18 17:28:49 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2017-06-13 16:27:39 -0400 |
| commit | a24fa22ce22ae302b3bf8f7008896d52d5d57b8d (patch) | |
| tree | 06c125fb23f5bd7b61f10d0d21110b8ed7ebccca /drivers/block | |
| parent | 71df1d7ccad1c36f7321d6b3b48f2ea42681c363 (diff) | |
| download | blackbird-obmc-linux-a24fa22ce22ae302b3bf8f7008896d52d5d57b8d.tar.gz blackbird-obmc-linux-a24fa22ce22ae302b3bf8f7008896d52d5d57b8d.zip | |
xen/blkback: don't use xen_blkif_get() in xen-blkback kthread
There is no need to use xen_blkif_get()/xen_blkif_put() in the kthread
of xen-blkback. Thread stopping is synchronous and using the blkif
reference counting in the kthread will avoid to ever let the reference
count drop to zero at the end of an I/O running concurrent to
disconnecting and multiple rings.
Setting ring->xenblkd to NULL after stopping the kthread isn't needed
as the kthread does this already.
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Steven Haigh <netwiz@crc.id.au>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/xen-blkback/blkback.c | 3 | ||||
| -rw-r--r-- | drivers/block/xen-blkback/xenbus.c | 1 |
2 files changed, 0 insertions, 4 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index 726c32e35db9..6b14c509f3c7 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -609,8 +609,6 @@ int xen_blkif_schedule(void *arg) unsigned long timeout; int ret; - xen_blkif_get(blkif); - set_freezable(); while (!kthread_should_stop()) { if (try_to_freeze()) @@ -665,7 +663,6 @@ purge_gnt_list: print_stats(ring); ring->xenblkd = NULL; - xen_blkif_put(blkif); return 0; } diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index 4cdf0490983e..792da683e70d 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -255,7 +255,6 @@ static int xen_blkif_disconnect(struct xen_blkif *blkif) if (ring->xenblkd) { kthread_stop(ring->xenblkd); wake_up(&ring->shutdown_wq); - ring->xenblkd = NULL; } /* The above kthread_stop() guarantees that at this point we |
