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authorStefano Stabellini <sstabellini@kernel.org>2018-12-21 23:06:29 (GMT)
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2019-01-02 15:59:48 (GMT)
commitb79470b64fa9266948d1ce8d825ced94c4f63293 (patch)
tree096e3cb80f128bbf7ed320f8141c13975a2d4d59 /drivers/xen
parent58f9d806d16a38ed3bae11e2ada83393436a4956 (diff)
pvcalls-front: read all data before closing the connection
When a connection is closing in_error is set to ENOTCONN. There could still be outstanding data on the ring left by the backend. Before closing the connection on the frontend side, drain the ring. 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>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/pvcalls-front.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 77224d8..e5d95aa 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -560,15 +560,13 @@ static int __read_ring(struct pvcalls_data_intf *intf,
error = intf->in_error;
/* get pointers before reading from the ring */
virt_rmb();
- if (error < 0)
- return error;
size = pvcalls_queued(prod, cons, array_size);
masked_prod = pvcalls_mask(prod, array_size);
masked_cons = pvcalls_mask(cons, array_size);
if (size == 0)
- return 0;
+ return error ?: size;
if (len > size)
len = size;

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