linux-kernel - [PATCH v2 0/3] wifi: rtw88: USB fixes

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Date:   Fri, 10 Feb 2023 12:16:29 +0100
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     linux-wireless@...r.kernel.org
Cc:     Neo Jou <neojou@...il.com>, Hans Ulli Kroll <linux@...i-kroll.de>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Yan-Hsuan Chuang <tony0620emma@...il.com>,
        Kalle Valo <kvalo@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        kernel@...gutronix.de, Alexander Hochbaum <alex@...udo.com>,
        Da Xue <da@...re.computer>, Po-Hao Huang <phhuang@...ltek.com>,
        Andreas Henriksson <andreas@...al.se>,
        Viktor Petrenko <g0000ga@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH v2 0/3] wifi: rtw88: USB fixes

This series addresses issues for the recently added RTW88 USB support
reported by Andreas Henriksson and also our customer.

The hardware can't handle urbs that have a size of multiple of the
bulkout_size (usually 512 bytes). The symptom is that the hardware
stalls completely. The issue can be reproduced by sending a suitably
sized ping packet from the device:

ping -s 394 <somehost>

(It's 394 bytes here on a RTL8822CU and RTL8821CU, the actual size may
differ on other chips, it was 402 bytes on a RTL8723DU)

Other than that qsel was not set correctly. The sympton here is that
only one of multiple bulk endpoints was used to send data.

Changes since v1:
- Use URB_ZERO_PACKET to let the USB host controller handle it automatically
  rather than working around the issue.

Sascha Hauer (3):
  wifi: rtw88: usb: Set qsel correctly
  wifi: rtw88: usb: send Zero length packets if necessary
  wifi: rtw88: usb: drop now unnecessary URB size check

 drivers/net/wireless/realtek/rtw88/usb.c | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

-- 
2.30.2