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490340fadd
RTL8811AU stops responding during the firmware download on some systems:
[ 809.256440] rtw_8821au 5-2.1:1.0: Firmware version 42.4.0, H2C version 0
[ 812.759142] rtw_8821au 5-2.1:1.0 wlp48s0f4u2u1: renamed from wlan0
[ 837.315388] rtw_8821au 1-4:1.0: write register 0x1ef4 failed with -110
[ 867.524259] rtw_8821au 1-4:1.0: write register 0x1ef8 failed with -110
[ 868.930976] rtw_8821au 5-2.1:1.0 wlp48s0f4u2u1: entered promiscuous mode
[ 897.730952] rtw_8821au 1-4:1.0: write register 0x1efc failed with -110
Each write takes 30 seconds to fail because that's the timeout currently
used for control messages in rtw_usb_write().
In this scenario the firmware download takes at least 2000 seconds.
Because this is done from the USB probe function, the long delay makes
other things in the system hang.
Reduce the timeout to 500 ms. This is the value used by the official USB
wifi drivers from Realtek.
Of course this only makes things hang for ~30 seconds instead of ~30
minutes. It doesn't fix the firmware download.
Tested with RTL8822CU, RTL8812BU, RTL8811CU, RTL8814AU, RTL8811AU,
RTL8812AU, RTL8821AU, RTL8723DU.
Cc: stable@vger.kernel.org
Fixes:
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