[PATCH] brcmfmac: firmware: Fix firmware loading
From: Linus Walleij <hidden>
Date: 2021-08-03 23:29:52
Subsystem:
broadcom brcm80211 ieee802.11 wireless drivers, the rest · Maintainers:
Arend van Spriel, Linus Torvalds
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 static 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 <redacted>
Signed-off-by: Linus Walleij <redacted>
---
.../broadcom/brcm80211/brcmfmac/firmware.c | 29 +++++++++++++------
1 file changed, 20 insertions(+), 9 deletions(-)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
index adfdfc654b10..71ca4a517e42 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
@@ -638,11 +636,26 @@ static int brcmf_fw_request_firmware(const struct firmware **fw, return request_firmware(fw, cur->path, fwctx->dev); } -static void brcmf_fw_request_done(const struct firmware *fw, void *ctx) +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]; + static bool retry = true; int ret; + /*Something failed with the first firmware request , such as not + * getting the per-board firmware. Retry this, now using the less + * specific path for the first firmware item, i.e. without the board + * suffix. + */ + if (!fw && retry) { + ret = request_firmware_nowait(THIS_MODULE, true, first->path, + fwctx->dev, GFP_KERNEL, fwctx, + brcmf_fw_request_done_first); + retry = false; + return; + } + ret = brcmf_fw_complete_request(fw, fwctx); while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) {
@@ -702,17 +715,15 @@ 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); + brcmf_fw_request_done_first); } if (ret < 0) - brcmf_fw_request_done(NULL, fwctx); + brcmf_fw_request_done_first(NULL, fwctx); return 0; }
--
2.31.1