diff options
| author | Stefano Stabellini <sstabellini@kernel.org> | 2018-12-21 15:06:33 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-27 10:08:02 +0100 |
| commit | 46625b8a4687e321394643609291ebe6637a30e1 (patch) | |
| tree | 40095c5777b145c3663add9649e3ddc0c0495ed2 /drivers/xen | |
| parent | 368a5c8beed054f8069de5f480b99e8f1008ce1f (diff) | |
pvcalls-back: set -ENOTCONN in pvcalls_conn_back_read
[ Upstream commit e6587cdbd732eacb4c7ce592ed46f7bbcefb655f ]
When a connection is closing we receive on pvcalls_sk_state_change
notification. Instead of setting the connection as closed immediately
(-ENOTCONN), let's read one more time from it: pvcalls_conn_back_read
will set the connection as closed when necessary.
That way, we avoid races between pvcalls_sk_state_change and
pvcalls_back_ioworker.
Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/pvcalls-back.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c index 169293c25a91..7185ebb63bd5 100644 --- a/drivers/xen/pvcalls-back.c +++ b/drivers/xen/pvcalls-back.c @@ -164,9 +164,10 @@ static void pvcalls_conn_back_read(void *opaque) /* write the data, then modify the indexes */ virt_wmb(); - if (ret < 0) + if (ret < 0) { + atomic_set(&map->read, 0); intf->in_error = ret; - else + } else intf->in_prod = prod + ret; /* update the indexes, then notify the other end */ virt_wmb(); @@ -296,7 +297,7 @@ static void pvcalls_sk_state_change(struct sock *sock) return; intf = map->ring; - intf->in_error = -ENOTCONN; + atomic_inc(&map->read); notify_remote_via_irq(map->irq); } |