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[ Upstream commit 671be46afd1f03de9dc6e4679c88e1a7a81cdff6 ] This read_poll_timeout_atomic() with a delay of 1 µs and a timeout of 1000000 µs can take ~250 seconds in the worst case because sending a USB control message takes ~250 µs. Lower the timeout to 4000 for USB in order to reduce the maximum polling time to ~1 second. This problem was observed with RTL8851BU while suspending to RAM with WOWLAN enabled. The computer sat for 4 minutes with a black screen before suspending. Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Link: https://patch.msgid.link/09313da6-c865-4e91-b758-4cb38a878796@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.