From: Jan Beulich <jbeulich@suse.com>
Date: Thu, 4 Feb 2021 13:01:21 +0000 (+0100)
Subject: IOREQ: fix waiting for broadcast completion
X-Git-Tag: archive/raspbian/4.16.0+51-g0941d6cb-1+rpi1~2^2~42^2~950
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=da20c93108226cb2eb2ed1a13225337f2318a642;p=xen.git

IOREQ: fix waiting for broadcast completion

Checking just a single server is not enough - all of them must have
signaled that they're done processing the request.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Paul Durrant <paul@xen.org>
---

diff --git a/xen/common/ioreq.c b/xen/common/ioreq.c
index 90ed2e0302..5b603c0520 100644
--- a/xen/common/ioreq.c
+++ b/xen/common/ioreq.c
@@ -213,9 +213,9 @@ bool vcpu_ioreq_handle_completion(struct vcpu *v)
         return false;
     }
 
-    sv = get_pending_vcpu(v, &s);
-    if ( sv && !wait_for_io(sv, get_ioreq(s, v)) )
-        return false;
+    while ( (sv = get_pending_vcpu(v, &s)) != NULL )
+        if ( !wait_for_io(sv, get_ioreq(s, v)) )
+            return false;
 
     vio->req.state = ioreq_needs_completion(&vio->req) ?
         STATE_IORESP_READY : STATE_IOREQ_NONE;