[PATCH v2] xen/xenbus: make xs_talkv() interruptible

[Juergen Gross <jgross@xxxxxxxx>]

In case a process waits for any Xenstore action in the xenbus driver
it should be interruptible by signals.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V2:
- don't special case SIGKILL as libxenstore is handling -EINTR fine
---
 drivers/xen/xenbus/xenbus_xs.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index 3a06eb699f33..17c8f8a155fd 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -205,8 +205,15 @@ static bool test_reply(struct xb_req_data *req)
 
 static void *read_reply(struct xb_req_data *req)
 {
+       int ret;
+
        do {
-               wait_event(req->wq, test_reply(req));
+               ret = wait_event_interruptible(req->wq, test_reply(req));
+
+               if (ret == -ERESTARTSYS && signal_pending(current)) {
+                       req->msg.type = XS_ERROR;
+                       return ERR_PTR(-EINTR);
+               }
 
                if (!xenbus_ok())
                        /*
-- 
2.26.2