RE: [PATCH rtw] wifi: rtw89: hw_scan: Don't let the operating channel be last

[Ping-Ke Shih <pkshih@realtek.com>]

Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> On 18/11/2025 04:17, Ping-Ke Shih wrote:
> > Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> >> Scanning can be offloaded to the firmware. To that end, the driver
> >> prepares a list of channels to scan, including periodic visits back to
> >> the operating channel, and sends the list to the firmware.
> >>
> >> When the channel list is too long to fit in a single H2C message, the
> >> driver splits the list, sends the first part, and tells the firmware to
> >> scan. When the scan is complete, the driver sends the next part of the
> >> list and tells the firmware to scan.
> >>
> >> When the last channel that fit in the H2C message is the operating
> >> channel something seems to go wrong in the firmware. It will
> >> acknowledge receiving the list of channels but apparently it will not
> >> do anything more. The AP can't be pinged anymore. The driver still
> >> receives beacons, though.
> >>
> >> One way to avoid this is to split the list of channels before the
> >> operating channel.
> >>
> >> Affected devices:
> >>
> >> * RTL8851BU with firmware 0.29.41.3
> >> * RTL8832BU with firmware 0.29.29.8
> >> * RTL8852BU with firmware 0.29.29.8
> 
> I made a mistake here. It should be:
> 
> RTL8851BU
> RTL8832BU
> RTL8852BE

I'll re-spin commit message with this information.

> 
> The report about the RTL8852BE came from a user who doesn't have the
> card anymore, unfortunately.
> 
> Actually, since I wrote that commit message I acquired RTL8851BE and
> I can reproduce the problem with that.
> 

I don't know why our site can't reproduce this issue. Since this patch
can help your and no obvious increasing scan time, I will take this
patch and send pull-request to 6.18-rc6.