linux-kernel - [PATCH v2] xen/xenbus: make xs

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Message-Id: <20201215111055.3810-1-jgross@suse.com>
Date:   Tue, 15 Dec 2020 12:10:55 +0100
From:   Juergen Gross <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: [PATCH v2] xen/xenbus: make xs_talkv() interruptible

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@...e.com>
---
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