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Can you please try to comment out the following lines in
brcmf_feat_attach? That's the only suspicious line that interact with
firmware in the patch.

+ brcmf_feat_iovar_data_set(ifp, BRCMF_FEAT_GSCAN, "pfn_gscan_cfg",
+                                            &gscan_cfg, sizeof(gscan_cfg));

I don't have a pi zero w but will try to see if I can reproduce it on a pi 3.

Franky/Arend, if a ZeroW would help now and in future Pi Wifi issues,
I can get one to you. Email me off list.

James

quoted

quoted

[2] - https://www.kraxel.org/cgit/linux/log/?h=bcm2837