On Sun, Nov 19, 2017 at 02:57:21PM +0100, Lambdadroid wrote:

Hi,

I just upgraded from 4.9.61 to 4.9.63 and noticed that there are no longer any WiFi networks found after upgrading.

After looking through the patches, it seems to be this brcmfmac commit from 4.9.62. Reverting it fixes the WiFi network scan. be5125d4fa9e: brcmfmac: setup wiphy bands after registering it first

However, looking further at the patch, it seems like it was submitted together with another patch that wasn't applied to 4.9: 9ea0c307609f: brcmfmac: don't preset all channels as disabled

Applying this patch additionally instead of reverting the broken patch seems to fix the issue as well.

Either way works. I'm not sure why only one of the patches were applied to stable. They were submitted together on linux-wireless: http://www.spinics.net/lists/linux-wireless/msg157813.html

For reference, I tested with a BCM43362 on Android and Arch Linux. Both didn't show any WiFi networks anymore after the update to 4.9.62+.

Thanks for letting us know about this, I've now queued up the extra patch to the 4.9-stable tree.

thanks,

greg k-h