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Larry Finger c713fb071e rtlwifi: rtl8821ae: Fix connection lost problem correctly 
There has been a coding error in rtl8821ae since it was first introduced,
namely that an 8-bit register was read using a 16-bit read in
_rtl8821ae_dbi_read(). This error was fixed with commit 40b368af4b
("rtlwifi: Fix alignment issues"); however, this change led to
instability in the connection. To restore stability, this change
was reverted in commit b8b8b16352 ("rtlwifi: rtl8821ae: Fix connection
lost problem").

Unfortunately, the unaligned access causes machine checks in ARM
architecture, and we were finally forced to find the actual cause of the
problem on x86 platforms. Following a suggestion from Pkshih
<pkshih@realtek.com>, it was found that increasing the ASPM L1
latency from 0 to 7 fixed the instability. This parameter was varied to
see if a smaller value would work; however, it appears that 7 is the
safest value. A new symbol is defined for this quantity, thus it can be
easily changed if necessary.

Fixes: b8b8b16352 ("rtlwifi: rtl8821ae: Fix connection lost problem")
Cc: Stable <stable@vger.kernel.org> # 4.14+
Fix-suggested-by: Pkshih <pkshih@realtek.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Tested-by: James Cameron <quozl@laptop.org>  # x86_64 OLPC NL3
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
2018-02-07 15:38:37 +02:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-29 10:15:51 -05:00
block
certs
crypto
Documentation Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-01-28 21:22:46 -05:00
drivers rtlwifi: rtl8821ae: Fix connection lost problem correctly 2018-02-07 15:38:37 +02:00
firmware
fs Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-29 10:15:51 -05:00
include net_sched: plug in qdisc ops change_tx_queue_len 2018-01-29 12:42:15 -05:00
init
ipc
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-01-28 21:22:46 -05:00
lib bpf: add further test cases around div/mod and others 2018-01-26 16:42:07 -08:00
mm
net tcp: release sk_frag.page in tcp_disconnect 2018-01-29 17:56:23 -05:00
samples samples/bpf: Partially fixes the bpf.o build 2018-01-26 23:57:10 +01:00
scripts
security
sound
tools tools/virtio: fix smp_mb on x86 2018-01-29 12:02:55 -05:00
usr
virt
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README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.