linux-kernel - [PATCH 6/9] ucb1400: Use disable_irq_nosync() from within irq handlers.

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 for Android: free password hash cracker in your pocket

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

Message-Id: <1239861298.29831.124.camel@linux-51e8.site>
Date:	Thu, 16 Apr 2009 15:54:58 +1000
From:	Ben Nizette <bn@...sdigital.com>
To:	dmitry.torokhov@...il.com
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: [PATCH 6/9] ucb1400: Use disable_irq_nosync() from within irq
	handlers.


disable_irq() should wait for all running handlers to complete
before returning.  As such, if it's used to disable an interrupt
from that interrupt's handler it will deadlock.  This replaces
the dangerous instances with the _nosync() variant which doesn't
have this problem.

Signed-off-by: Ben Nizette <bn@...sdigital.com>
---
diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c
index e868264..f100c7f 100644
--- a/drivers/input/touchscreen/ucb1400_ts.c
+++ b/drivers/input/touchscreen/ucb1400_ts.c
@@ -256,7 +256,7 @@ static irqreturn_t ucb1400_hard_irq(int irqnr, void *devid)
 	struct ucb1400_ts *ucb = devid;
 
 	if (irqnr == ucb->irq) {
-		disable_irq(ucb->irq);
+		disable_irq_nosync(ucb->irq);
 		ucb->irq_pending = 1;
 		wake_up(&ucb->ts_wait);
 		return IRQ_HANDLED;
-- 
1.6.0.2



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/