linux-kernel - [PATCH] net: usb: r8152: fix resume reset deadlock

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Message-ID: <20260128070222.3393746-1-senozhatsky@chromium.org>
Date: Wed, 28 Jan 2026 16:01:52 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Lunn <andrew+netdev@...n.ch>
Cc: Douglas Anderson <dianders@...omium.org>,
	Tomasz Figa <tfiga@...omium.org>,
	linux-usb@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCH] net: usb: r8152: fix resume reset deadlock

rtl8152 can trigger device reset during reset which
potentially can result in a deadlock:

 **** DPM device timeout after 10 seconds; 15 seconds until panic ****
 Call Trace:
 <TASK>
 schedule+0x483/0x1370
 schedule_preempt_disabled+0x15/0x30
 __mutex_lock_common+0x1fd/0x470
 __rtl8152_set_mac_address+0x80/0x1f0
 dev_set_mac_address+0x7f/0x150
 rtl8152_post_reset+0x72/0x150
 usb_reset_device+0x1d0/0x220
 rtl8152_resume+0x99/0xc0
 usb_resume_interface+0x3e/0xc0
 usb_resume_both+0x104/0x150
 usb_resume+0x22/0x110

The problem is that rtl8152 resume calls reset under
tp->control mutex while reset basically re-enters rtl8152
and attempts to acquire the same tp->control lock once
again.

Reset INACCESSIBLE device outside of tp->control mutex
scope to avoid recursive mutex_lock() deadlock.

Fixes: 4933b066fefb ("r8152: If inaccessible at resume time, issue a reset")
Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---
 drivers/net/usb/r8152.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 30f937527cd2..c4f4e6a35ff4 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -8538,19 +8538,6 @@ static int rtl8152_system_resume(struct r8152 *tp)
 		usb_submit_urb(tp->intr_urb, GFP_NOIO);
 	}
 
-	/* If the device is RTL8152_INACCESSIBLE here then we should do a
-	 * reset. This is important because the usb_lock_device_for_reset()
-	 * that happens as a result of usb_queue_reset_device() will silently
-	 * fail if the device was suspended or if too much time passed.
-	 *
-	 * NOTE: The device is locked here so we can directly do the reset.
-	 * We don't need usb_lock_device_for_reset() because that's just a
-	 * wrapper over device_lock() and device_resume() (which calls us)
-	 * does that for us.
-	 */
-	if (test_bit(RTL8152_INACCESSIBLE, &tp->flags))
-		usb_reset_device(tp->udev);
-
 	return 0;
 }
 
@@ -8661,6 +8648,7 @@ static int rtl8152_suspend(struct usb_interface *intf, pm_message_t message)
 static int rtl8152_resume(struct usb_interface *intf)
 {
 	struct r8152 *tp = usb_get_intfdata(intf);
+	bool system_resume = !test_bit(SELECTIVE_SUSPEND, &tp->flags);
 	int ret;
 
 	mutex_lock(&tp->control);
@@ -8674,6 +8662,19 @@ static int rtl8152_resume(struct usb_interface *intf)
 
 	mutex_unlock(&tp->control);
 
+	/* If the device is RTL8152_INACCESSIBLE here then we should do a
+	 * reset. This is important because the usb_lock_device_for_reset()
+	 * that happens as a result of usb_queue_reset_device() will silently
+	 * fail if the device was suspended or if too much time passed.
+	 *
+	 * NOTE: The device is locked here so we can directly do the reset.
+	 * We don't need usb_lock_device_for_reset() because that's just a
+	 * wrapper over device_lock() and device_resume() (which calls us)
+	 * does that for us.
+	 */
+	if (system_resume && test_bit(RTL8152_INACCESSIBLE, &tp->flags))
+		ret = usb_reset_device(tp->udev);
+
 	return ret;
 }
 
-- 
2.53.0.rc1.225.gd81095ad13-goog