linux-kernel - [PATCH 5.14 47/48] Revert "brcmfmac: use ISO3166 country code and 0 rev as fallback"

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Message-Id: <20211008112721.627447018@linuxfoundation.org>
Date:   Fri,  8 Oct 2021 13:28:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Soeren Moch <smoch@....de>,
        Shawn Guo <shawn.guo@...aro.org>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 5.14 47/48] Revert "brcmfmac: use ISO3166 country code and 0 rev as fallback"

From: Soeren Moch <smoch@....de>

commit 151a7c12c4fc8340b51e849e4d1fcb7d794777a5 upstream.

This reverts commit b0b524f079a23e440dd22b04e369368dde847533.

Commit b0b524f079a2 ("brcmfmac: use ISO3166 country code and 0 rev
as fallback") changes country setup to directly use ISO3166 country
codes if no more specific code is configured. This was done under
the assumption that brcmfmac firmwares can handle such simple
direct mapping from country codes to firmware ccode values.

Unfortunately this is not true for all chipset/firmware combinations.
E.g. BCM4359/9 devices stop working as access point with this change,
so revert the offending commit to avoid the regression.

Signed-off-by: Soeren Moch <smoch@....de>
Cc: stable@...r.kernel.org  # 5.14.x
Acked-by: Shawn Guo <shawn.guo@...aro.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/20210926201905.211605-1-smoch@web.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c |   17 ++++--------
 1 file changed, 6 insertions(+), 11 deletions(-)

--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -7455,23 +7455,18 @@ static s32 brcmf_translate_country_code(
 	s32 found_index;
 	int i;
 
+	country_codes = drvr->settings->country_codes;
+	if (!country_codes) {
+		brcmf_dbg(TRACE, "No country codes configured for device\n");
+		return -EINVAL;
+	}
+
 	if ((alpha2[0] == ccreq->country_abbrev[0]) &&
 	    (alpha2[1] == ccreq->country_abbrev[1])) {
 		brcmf_dbg(TRACE, "Country code already set\n");
 		return -EAGAIN;
 	}
 
-	country_codes = drvr->settings->country_codes;
-	if (!country_codes) {
-		brcmf_dbg(TRACE, "No country codes configured for device, using ISO3166 code and 0 rev\n");
-		memset(ccreq, 0, sizeof(*ccreq));
-		ccreq->country_abbrev[0] = alpha2[0];
-		ccreq->country_abbrev[1] = alpha2[1];
-		ccreq->ccode[0] = alpha2[0];
-		ccreq->ccode[1] = alpha2[1];
-		return 0;
-	}
-
 	found_index = -1;
 	for (i = 0; i < country_codes->table_size; i++) {
 		cc = &country_codes->table[i];