linux-kernel - [PATCH AUTOSEL 4.9 42/48] usb: chipidea: Prevent unbalanced IRQ disable

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: <20181031231054.29333-42-sashal@kernel.org>
Date:   Wed, 31 Oct 2018 19:10:48 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Loic Poulain <loic.poulain@...aro.org>,
        Peter Chen <peter.chen@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.9 42/48] usb: chipidea: Prevent unbalanced IRQ disable

From: Loic Poulain <loic.poulain@...aro.org>

[ Upstream commit 8b97d73c4d72a2abf58f8e49062a7ee1e5f1334e ]

The ChipIdea IRQ is disabled before scheduling the otg work and
re-enabled on otg work completion. However if the job is already
scheduled we have to undo the effect of disable_irq int order to
balance the IRQ disable-depth value.

Fixes: be6b0c1bd0be ("usb: chipidea: using one inline function to cover queue work operations")
Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
Signed-off-by: Peter Chen <peter.chen@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/chipidea/otg.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/otg.h b/drivers/usb/chipidea/otg.h
index 9ecb598e48f0..a5557c70034a 100644
--- a/drivers/usb/chipidea/otg.h
+++ b/drivers/usb/chipidea/otg.h
@@ -20,7 +20,8 @@ void ci_handle_vbus_change(struct ci_hdrc *ci);
 static inline void ci_otg_queue_work(struct ci_hdrc *ci)
 {
 	disable_irq_nosync(ci->irq);
-	queue_work(ci->wq, &ci->work);
+	if (queue_work(ci->wq, &ci->work) == false)
+		enable_irq(ci->irq);
 }
 
 #endif /* __DRIVERS_USB_CHIPIDEA_OTG_H */
-- 
2.17.1