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| author | Dongli Zhang <dongli.zhang@oracle.com> | 2020-03-03 23:14:23 +0100 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2020-03-05 16:42:01 +0100 |
| commit | 8130b9d5b5abf26f9927b487c15319a187775f34 (patch) | |
| tree | 647cbd1ff16e7cc558524d766b95f7e913b16494 /drivers | |
| parent | xenbus: req->body should be updated before req->state (diff) | |
| download | linux-8130b9d5b5abf26f9927b487c15319a187775f34.tar.xz linux-8130b9d5b5abf26f9927b487c15319a187775f34.zip | |
xenbus: req->err should be updated before req->state
This patch adds the barrier to guarantee that req->err is always updated
before req->state.
Otherwise, read_reply() would not return ERR_PTR(req->err) but
req->body, when process_writes()->xb_write() is failed.
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Link: https://lore.kernel.org/r/20200303221423.21962-2-dongli.zhang@oracle.com
Reviewed-by: Julien Grall <jgrall@amazon.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/xen/xenbus/xenbus_comms.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/xen/xenbus/xenbus_comms.c b/drivers/xen/xenbus/xenbus_comms.c index 852ed161fc2a..eb5151fc8efa 100644 --- a/drivers/xen/xenbus/xenbus_comms.c +++ b/drivers/xen/xenbus/xenbus_comms.c @@ -397,6 +397,8 @@ static int process_writes(void) if (state.req->state == xb_req_state_aborted) kfree(state.req); else { + /* write err, then update state */ + virt_wmb(); state.req->state = xb_req_state_got_reply; wake_up(&state.req->wq); } |