linux-kernel - Re: [syzbot] [block?] [usb?] INFO: rcu detected stall in aoecmd

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Message-Id: <20240508234053.2319-1-hdanton@sina.com>
Date: Thu,  9 May 2024 07:40:53 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+1e6e0b916b211bee1bd6@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [block?] [usb?] INFO: rcu detected stall in aoecmd_cfg (2)

On Wed, 08 May 2024 12:27:20 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    9221b2819b8a Add linux-next specific files for 20240503
> git tree:       linux-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161a5d1f180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git  9221b2819b8a

--- l/drivers/input/misc/yealink.c
+++ y/drivers/input/misc/yealink.c
@@ -436,7 +436,7 @@ static void urb_irq_callback(struct urb
 
 	yealink_do_idle_tasks(yld);
 
-	if (!yld->shutdown) {
+	if (!yld->shutdown && status != -EPROTO) {
 		ret = usb_submit_urb(yld->urb_ctl, GFP_ATOMIC);
 		if (ret && ret != -EPERM)
 			dev_err(&yld->intf->dev,
@@ -458,13 +458,13 @@ static void urb_ctl_callback(struct urb
 	case CMD_KEYPRESS:
 	case CMD_SCANCODE:
 		/* ask for a response */
-		if (!yld->shutdown)
+		if (!yld->shutdown && status != -EPROTO)
 			ret = usb_submit_urb(yld->urb_irq, GFP_ATOMIC);
 		break;
 	default:
 		/* send new command */
 		yealink_do_idle_tasks(yld);
-		if (!yld->shutdown)
+		if (!yld->shutdown && status != -EPROTO)
 			ret = usb_submit_urb(yld->urb_ctl, GFP_ATOMIC);
 		break;
 	}
--