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Subject: Re: [PATCH v3] brcmfmac: firmware: Fix firmware loading
To:     Linus Walleij <linus.walleij@linaro.org>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Chi-hsien Lin <chi-hsien.lin@infineon.com>,
        Wright Feng <wright.feng@infineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@infineon.com>,
        Kalle Valo <kvalo@codeaurora.org>
Cc:     linux-wireless@vger.kernel.org,
        Stefan Hansson <newbyte@disroot.org>,
        Arend van Spriel <arend.vanspriel@broadcom.com>
References: <20210805093023.3465081-1-linus.walleij@linaro.org>
From:   Dmitry Osipenko <digetx@gmail.com>
Message-ID: <9316a403-e755-3870-6393-62f20792af44@gmail.com>
Date:   Thu, 5 Aug 2021 13:31:05 +0300
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05.08.2021 12:30, Linus Walleij пишет:
> The patch that would first try the board-specific firmware
> had a bug because the fallback would not be called: the
> asynchronous interface is used meaning request_firmware_nowait()
> returns 0 immediately.
> 
> Harden the firmware loading like this:
> 
> - If we cannot build an alt_path (like if no board_type is
>   specified) just request the first firmware without any
>   suffix, like in the past.
> 
> - If the lookup of a board specific firmware fails, we get
>   a NULL fw in the async callback, so just try again without
>   the alt_path. Use a context state variable to check that
>   we do not try this indefinitely.
> 
> - Rename the brcm_fw_request_done to brcm_fw_request_done_first
>   reflecting the fact that this callback is only used for the
>   first (main) firmware file, and drop the unnecessary
>   prototype.
> 
> Fixes: 5ff013914c62 ("brcmfmac: firmware: Allow per-board firmware binaries")
> Cc: Dmitry Osipenko <digetx@gmail.com>
> Cc: Stefan Hansson <newbyte@disroot.org>
> Tested-by: Dmitry Osipenko <digetx@gmail.com>
> Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> ChangeLog v2->v3:
> - Rename state variable to "tried_board_variant".
> ChangeLog v1->v2:
> - Instead of using a static variable, add a context variable
>   "tested_board_variant"
> - Collect Arend's review tag.
> - Collect Tested-by from Dmitry.
> ---

Combining my previous comments together, I rewrote it like this:

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
index adfdfc654b10..4198ca9d898c 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
@@ -431,8 +431,6 @@ struct brcmf_fw {
 	void (*done)(struct device *dev, int err, struct brcmf_fw_request *req);
 };
 
-static void brcmf_fw_request_done(const struct firmware *fw, void *ctx);
-
 #ifdef CONFIG_EFI
 /* In some cases the EFI-var stored nvram contains "ccode=ALL" or "ccode=XV"
  * to specify "worldwide" compatible settings, but these 2 ccode-s do not work
@@ -658,6 +656,21 @@ static void brcmf_fw_request_done(const struct firmware *fw, void *ctx)
 	kfree(fwctx);
 }
 
+static void brcmf_fw_request_done_first(const struct firmware *fw, void *ctx)
+{
+	struct brcmf_fw *fwctx = ctx;
+	struct brcmf_fw_item *first = &fwctx->req->items[0];
+	int ret = 0;
+
+	if (!fw)
+		ret = request_firmware_nowait(THIS_MODULE, true, first->path,
+					      fwctx->dev, GFP_KERNEL, fwctx,
+					      brcmf_fw_request_done);
+
+	if (fw || ret < 0)
+		brcmf_fw_request_done(fw, ctx);
+}
+
 static bool brcmf_fw_request_is_valid(struct brcmf_fw_request *req)
 {
 	struct brcmf_fw_item *item;
@@ -702,11 +715,9 @@ int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req,
 	if (alt_path) {
 		ret = request_firmware_nowait(THIS_MODULE, true, alt_path,
 					      fwctx->dev, GFP_KERNEL, fwctx,
-					      brcmf_fw_request_done);
+					      brcmf_fw_request_done_first);
 		kfree(alt_path);
-	}
-	/* Else try canonical path */
-	if (ret) {
+	} else {
 		ret = request_firmware_nowait(THIS_MODULE, true, first->path,
 					      fwctx->dev, GFP_KERNEL, fwctx,
 					      brcmf_fw_request_done);
--