[PATCH REPOST net-next 1/2] r8152: If inaccessible at resume time, issue a reset

[PATCH REPOST net-next 1/2] r8152: If inaccessible at resume time, issue a reset

[Douglas Anderson]

If we happened to get a USB transfer error during the transition to
suspend then the usb_queue_reset_device() that r8152_control_msg()
calls will get dropped on the floor. This is because
usb_lock_device_for_reset() (which usb_queue_reset_device() uses)
silently fails if it's called when a device is suspended or if too
much time passes.

Let's resolve this by resetting the device ourselves in r8152's
resume() function.

NOTE: due to timing, it's _possible_ that we could end up with two USB
resets: the one queued previously and the one called from the resume()
patch. This didn't happen in test cases I ran, though it's conceivably
possible. We can't easily know if this happened since
usb_queue_reset_device() can just silently drop the reset request. In
any case, it's not expected that this is a problem since the two
resets can't run at the same time (because of the device lock) and it
should be OK to reset the device twice. If somehow the double-reset
causes problems we could prevent resets from being queued up while
suspend is running.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---
Reposting now that the merge window is open as per [1].

[1] https://lore.kernel.org/r/75651199a933427a7fc3980ef8a2139f5f1f1695.camel@redhat.com

 drivers/net/usb/r8152.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 19df1cd9f072..6a3f4b2114ee 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -8554,6 +8554,19 @@ 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;
 }
 
-- 
2.45.1.288.g0e0cd299f1-goog

RE: [PATCH REPOST net-next 1/2] r8152: If inaccessible at resume time, issue a reset

[Hayes Wang]

Douglas Anderson <dianders@chromium.org>
> Sent: Friday, May 31, 2024 7:43 AM
[...]
> If we happened to get a USB transfer error during the transition to
> suspend then the usb_queue_reset_device() that r8152_control_msg()
> calls will get dropped on the floor. This is because
> usb_lock_device_for_reset() (which usb_queue_reset_device() uses)
> silently fails if it's called when a device is suspended or if too
> much time passes.
> 
> Let's resolve this by resetting the device ourselves in r8152's
> resume() function.
> 
> NOTE: due to timing, it's _possible_ that we could end up with two USB
> resets: the one queued previously and the one called from the resume()
> patch. This didn't happen in test cases I ran, though it's conceivably
> possible. We can't easily know if this happened since
> usb_queue_reset_device() can just silently drop the reset request. In
> any case, it's not expected that this is a problem since the two
> resets can't run at the same time (because of the device lock) and it
> should be OK to reset the device twice. If somehow the double-reset
> causes problems we could prevent resets from being queued up while
> suspend is running.
> 
> Signed-off-by: Douglas Anderson <dianders@chromium.org>

Acked-by: Hayes Wang <hayeswang@realtek.com>

Best Regards,
Hayes

Re: [PATCH REPOST net-next 1/2] r8152: If inaccessible at resume time, issue a reset

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 30 May 2024 16:43:08 -0700 you wrote:
> If we happened to get a USB transfer error during the transition to
> suspend then the usb_queue_reset_device() that r8152_control_msg()
> calls will get dropped on the floor. This is because
> usb_lock_device_for_reset() (which usb_queue_reset_device() uses)
> silently fails if it's called when a device is suspended or if too
> much time passes.
> 
> [...]

Here is the summary with links:
  - [REPOST,net-next,1/2] r8152: If inaccessible at resume time, issue a reset
    https://git.kernel.org/netdev/net-next/c/4933b066fefb
  - [REPOST,net-next,2/2] r8152: Wake up the system if the we need a reset
    https://git.kernel.org/netdev/net-next/c/8c1d92a740c0

You are awesome, thank you!
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