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From:   Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
To:     Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>
Cc:     Alyssa Rosenzweig <alyssa@rosenzweig.io>, asahi@lists.linux.dev,
        brcm80211-dev-list.pdl@broadcom.com,
        "David S. Miller" <davem@davemloft.net>,
        devicetree@vger.kernel.org, Eric Dumazet <edumazet@google.com>,
        Hector Martin <marcan@marcan.st>,
        Jakub Kicinski <kuba@kernel.org>,
        Kalle Valo <kvalo@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        linux-arm-kernel@lists.infradead.org,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        Paolo Abeni <pabeni@redhat.com>,
        "Rafa__ Mi__ecki" <zajec5@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        SHA-cyfmac-dev-list@infineon.com, Sven Peter <sven@svenpeter.dev>
Subject: [PATCH wireless-next v2 02/12] brcmfmac: firmware: Handle per-board
 clm_blob files
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Message-Id: <E1oXg7S-0064um-F7@rmk-PC.armlinux.org.uk>
Sender: Russell King <rmk@armlinux.org.uk>
Date:   Mon, 12 Sep 2022 10:52:46 +0100
Precedence: bulk

From: Hector Martin <marcan@marcan.st>

Teach brcm_alt_fw_paths to correctly split off variable length
extensions, and enable alt firmware lookups for the CLM blob firmware
requests.

Apple platforms have per-board CLM blob files.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../broadcom/brcm80211/brcmfmac/firmware.c    | 33 +++++++++++--------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
index 15e99d8865bd..6c7c0c8f94ce 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
@@ -587,22 +587,29 @@ static int brcmf_fw_complete_request(const struct firmware *fw,
 
 static char *brcm_alt_fw_path(const char *path, const char *board_type)
 {
-	char alt_path[BRCMF_FW_NAME_LEN];
-	char suffix[5];
+	char base[BRCMF_FW_NAME_LEN];
+	const char *suffix;
+	char *ret;
 
-	strscpy(alt_path, path, BRCMF_FW_NAME_LEN);
-	/* At least one character + suffix */
-	if (strlen(alt_path) < 5)
+	if (!board_type)
 		return NULL;
 
-	/* strip .txt or .bin at the end */
-	strscpy(suffix, alt_path + strlen(alt_path) - 4, 5);
-	alt_path[strlen(alt_path) - 4] = 0;
-	strlcat(alt_path, ".", BRCMF_FW_NAME_LEN);
-	strlcat(alt_path, board_type, BRCMF_FW_NAME_LEN);
-	strlcat(alt_path, suffix, BRCMF_FW_NAME_LEN);
+	suffix = strrchr(path, '.');
+	if (!suffix || suffix == path)
+		return NULL;
+
+	/* strip extension at the end */
+	strscpy(base, path, BRCMF_FW_NAME_LEN);
+	base[suffix - path] = 0;
+
+	ret = kasprintf(GFP_KERNEL, "%s.%s%s", base, board_type, suffix);
+	if (!ret)
+		brcmf_err("out of memory allocating firmware path for '%s'\n",
+			  path);
+
+	brcmf_dbg(TRACE, "FW alt path: %s\n", ret);
 
-	return kstrdup(alt_path, GFP_KERNEL);
+	return ret;
 }
 
 static int brcmf_fw_request_firmware(const struct firmware **fw,
@@ -612,7 +619,7 @@ static int brcmf_fw_request_firmware(const struct firmware **fw,
 	int ret;
 
 	/* Files can be board-specific, first try a board-specific path */
-	if (cur->type == BRCMF_FW_TYPE_NVRAM && fwctx->req->board_type) {
+	if (fwctx->req->board_type) {
 		char *alt_path;
 
 		alt_path = brcm_alt_fw_path(cur->path, fwctx->req->board_type);
-- 
2.30.2