linux-kernel - [PATCH v2] usb: dwc3: gadget: don't rely on jiffies while holding spinlock

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: <1471952927-26389-1-git-send-email-nicolassaenzj@gmail.com>
Date:   Tue, 23 Aug 2016 12:48:47 +0100
From:   Nicolas Saenz Julienne <nicolassaenzj@...il.com>
To:     balbi@...nel.org
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] usb: dwc3: gadget: don't rely on jiffies while holding spinlock

__dwc3_gadget_wakeup() is called while holding a spinlock, then depends on
jiffies in order to timeout while polling the USB core for a link state
update. In the case the wakeup failed, the timeout will never happen and
will also cause the cpu to stall until rcu_preempt kicks in.

This switches to a "decrement variable and wait" timeout scheme.

Signed-off-by: Nicolas Saenz Julienne <nicolassaenzj@...il.com>
---
v2. removed udelay() from while loop
note: resubmitting since earlier patch had errata on e-mail address

 drivers/usb/dwc3/gadget.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 1f5597e..122e64d 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1433,7 +1433,7 @@ static int dwc3_gadget_get_frame(struct usb_gadget *g)
 
 static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
 {
-	unsigned long		timeout;
+	int			retries;
 
 	int			ret;
 	u32			reg;
@@ -1484,9 +1484,9 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
 	}
 
 	/* poll until Link State changes to ON */
-	timeout = jiffies + msecs_to_jiffies(100);
+	retries = 20000;
 
-	while (!time_after(jiffies, timeout)) {
+	while (retries--) {
 		reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 
 		/* in HS, means ON */
-- 
2.7.4