OpenWrt – Rev 1
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From 5b587496dc63595b71265d986ce69728c2724370 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 10 Oct 2018 13:00:59 +0200
Subject: [PATCH] brcmfmac: Remove recursion from firmware load error handling
Before this commit brcmf_fw_request_done would call
brcmf_fw_request_next_item to load the next item, which on an error would
call brcmf_fw_request_done, which if the error is recoverable (*) will
then continue calling brcmf_fw_request_next_item for the next item again
which on an error will call brcmf_fw_request_done again...
This does not blow up because we only have a limited number of items so
we never recurse too deep. But the recursion is still quite ugly and
frankly is giving me a headache, so lets fix this.
This commit fixes this by removing brcmf_fw_request_next_item and by
making brcmf_fw_get_firmwares and brcmf_fw_request_done directly call
firmware_request_nowait resp. firmware_request themselves.
*) brcmf_fw_request_nvram_done fallback path succeeds or
BRCMF_FW_REQF_OPTIONAL is set
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---
.../broadcom/brcm80211/brcmfmac/firmware.c | 65 +++++++---------------
1 file changed, 19 insertions(+), 46 deletions(-)
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
@@ -532,33 +532,6 @@ static int brcmf_fw_complete_request(con
return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret;
}
-static int brcmf_fw_request_next_item(struct brcmf_fw *fwctx, bool async)
-{
- struct brcmf_fw_item *cur;
- const struct firmware *fw = NULL;
- int ret;
-
- cur = &fwctx->req->items[fwctx->curpos];
-
- brcmf_dbg(TRACE, "%srequest for %s\n", async ? "async " : "",
- cur->path);
-
- if (async)
- ret = request_firmware_nowait(THIS_MODULE, true, cur->path,
- fwctx->dev, GFP_KERNEL, fwctx,
- brcmf_fw_request_done);
- else
- ret = request_firmware(&fw, cur->path, fwctx->dev);
-
- if (ret < 0) {
- brcmf_fw_request_done(NULL, fwctx);
- } else if (!async && fw) {
- brcmf_fw_complete_request(fw, fwctx);
- return -EAGAIN;
- }
- return 0;
-}
-
static void brcmf_fw_request_done(const struct firmware *fw, void *ctx)
{
struct brcmf_fw *fwctx = ctx;
@@ -568,26 +541,19 @@ static void brcmf_fw_request_done(const
cur = &fwctx->req->items[fwctx->curpos];
ret = brcmf_fw_complete_request(fw, fwctx);
- if (ret < 0)
- goto fail;
- do {
- if (++fwctx->curpos == fwctx->req->n_items) {
- ret = 0;
- goto done;
- }
-
- ret = brcmf_fw_request_next_item(fwctx, false);
- } while (ret == -EAGAIN);
-
- return;
-
-fail:
- brcmf_dbg(TRACE, "failed err=%d: dev=%s, fw=%s\n", ret,
- dev_name(fwctx->dev), cur->path);
- brcmf_fw_free_request(fwctx->req);
- fwctx->req = NULL;
-done:
+ while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) {
+ cur = &fwctx->req->items[fwctx->curpos];
+ request_firmware(&fw, cur->path, fwctx->dev);
+ ret = brcmf_fw_complete_request(fw, ctx);
+ }
+
+ if (ret) {
+ brcmf_dbg(TRACE, "failed err=%d: dev=%s, fw=%s\n", ret,
+ dev_name(fwctx->dev), cur->path);
+ brcmf_fw_free_request(fwctx->req);
+ fwctx->req = NULL;
+ }
fwctx->done(fwctx->dev, ret, fwctx->req);
kfree(fwctx);
}
@@ -611,7 +577,9 @@ int brcmf_fw_get_firmwares(struct device
void (*fw_cb)(struct device *dev, int err,
struct brcmf_fw_request *req))
{
+ struct brcmf_fw_item *first = &req->items[0];
struct brcmf_fw *fwctx;
+ int ret;
brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev));
if (!fw_cb)
@@ -628,7 +596,12 @@ int brcmf_fw_get_firmwares(struct device
fwctx->req = req;
fwctx->done = fw_cb;
- brcmf_fw_request_next_item(fwctx, true);
+ ret = request_firmware_nowait(THIS_MODULE, true, first->path,
+ fwctx->dev, GFP_KERNEL, fwctx,
+ brcmf_fw_request_done);
+ if (ret < 0)
+ brcmf_fw_request_done(NULL, fwctx);
+
return 0;
}