linux-kernel - [PATCH 4.8 072/125] staging: ks7010: fix wait_for_completion_interruptible

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20161029134950.194099986@linuxfoundation.org>
Date:   Sat, 29 Oct 2016 09:49:50 -0400
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH 4.8 072/125] staging: ks7010: fix wait_for_completion_interruptible_timeout return handling

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Mc Guire <hofrat@...dl.org>

commit 9d29f14db1095f52ca00b8162b242d6fce07d19f upstream.

wait_for_completion_interruptible_timeout return 0 on timeout and
-ERESTARTSYS if interrupted. The check for
!wait_for_completion_interruptible_timeout() would report an interrupt
as timeout. Further, while HZ/50 will work most of the time it could
fail for HZ < 50, so this is switched to msecs_to_jiffies(20).

Fixes: 13a9930d15b4 ("staging: ks7010: add driver from Nanonote extra-repository")

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/ks7010/ks_hostif.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/staging/ks7010/ks_hostif.c
+++ b/drivers/staging/ks7010/ks_hostif.c
@@ -74,11 +74,15 @@ void ks_wlan_hw_wakeup_task(struct work_
 	struct ks_wlan_private *priv =
 	    container_of(work, struct ks_wlan_private, ks_wlan_wakeup_task);
 	int ps_status = atomic_read(&priv->psstatus.status);
+	long time_left;
 
 	if (ps_status == PS_SNOOZE) {
 		ks_wlan_hw_wakeup_request(priv);
-		if (!wait_for_completion_interruptible_timeout(&priv->psstatus.wakeup_wait, HZ / 50)) {	/* 20ms timeout */
-			DPRINTK(1, "wake up timeout !!!\n");
+		time_left = wait_for_completion_interruptible_timeout(
+				&priv->psstatus.wakeup_wait,
+				msecs_to_jiffies(20));
+		if (time_left <= 0) {
+			DPRINTK(1, "wake up timeout or interrupted !!!\n");
 			schedule_work(&priv->ks_wlan_wakeup_task);
 			return;
 		}