On 01/29/2017 07:13 PM, Jurij Smakov wrote:
[Contacting authors of the problematic commit with proposed patch]
Hello,
I was investigating the regression in performance of wifi on my laptop (using
rtl8192ce driver) and I believe that it is a result of recent commit 339162b:
https://github.com/torvalds/linux/commit/cf4747d7535a936105f0abe8d8109d3fe339162b
I believe that during the refactoring the default name of the firmware file was
erroneously changed to rtlwifi/rtl8192cfwU.bin (was rtlwifi/rtl8192cfw.bin
before this change) and, as a result, some logic used to determine the correct
name of the firmware file for different sub-versions of the card was removed
mistakenly as well. This causes wrong firmware to be loaded on my machine
(rtl8192cfwU.bin instead of rtl8192cfw.bin), resulting in much more unstable
link.
Please consider applying the following patch to fix this situation:
http://www.wooyd.org/tmp/rtl8192ce_firmware.patch
I built a kernel with this patch applied, and the expected firmware was loaded
as a result, fixing my problem:
[ 13.202250] rtl8192ce: Using firmware rtlwifi/rtl8192cfw.bin
[ 13.253980] ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
[ 13.254434] rtlwifi: rtlwifi: wireless switch is on
[ 13.460663] rtl8192ce :03:00.0: firmware: direct-loading firmware
rtlwifi/rtl8192cfw.bin
Jurij,
Good catch. That explains why I have been unable to duplicate the problems that
some users have reported. As it happens, my test chip uses
rtlwifi/rtl8192cfwU_B.bin and was not affected by the bug.
I will be sending the fix to mainline with you as the author.
Thanks,
Larry
