linux-kernel - [PATCH 5.4 25/70] rt2x00: do not mark device gone on EPROTO errors during start

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Date:   Mon,  6 Dec 2021 15:56:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stanislaw Gruszka <stf_xl@...pl>,
        Kalle Valo <kvalo@...eaurora.org>, Exuvo <exuvo@...vo.se>
Subject: [PATCH 5.4 25/70] rt2x00: do not mark device gone on EPROTO errors during start

From: Stanislaw Gruszka <stf_xl@...pl>

commit ed53ae75693096f1c10b4561edd31a07b631bd72 upstream.

As reported by Exuvo is possible that we have lot's of EPROTO errors
during device start i.e. firmware load. But after that device works
correctly. Hence marking device gone by few EPROTO errors done by
commit e383c70474db ("rt2x00: check number of EPROTO errors") caused
regression - Exuvo device stop working after kernel update. To fix
disable the check during device start.

Link: https://lore.kernel.org/linux-wireless/bff7d309-a816-6a75-51b6-5928ef4f7a8c@exuvo.se/
Reported-and-tested-by: Exuvo <exuvo@...vo.se>
Fixes: e383c70474db ("rt2x00: check number of EPROTO errors")
Cc: stable@...r.kernel.org
Signed-off-by: Stanislaw Gruszka <stf_xl@...pl>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/20211111141003.GA134627@wp.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/ralink/rt2x00/rt2x00usb.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
@@ -25,6 +25,9 @@ static bool rt2x00usb_check_usb_error(st
 	if (status == -ENODEV || status == -ENOENT)
 		return true;
 
+	if (!test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
+		return false;
+
 	if (status == -EPROTO || status == -ETIMEDOUT)
 		rt2x00dev->num_proto_errs++;
 	else