package/kernel/mac80211/patches/brcm/320-v4.21-0002-brcmfmac-Remove-recursion-from-firmware-load-error-h.patch

   1 From 5b587496dc63595b71265d986ce69728c2724370 Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Wed, 10 Oct 2018 13:00:59 +0200
   4 Subject: [PATCH] brcmfmac: Remove recursion from firmware load error handling
   5
   6 Before this commit brcmf_fw_request_done would call
   7 brcmf_fw_request_next_item to load the next item, which on an error would
   8 call brcmf_fw_request_done, which if the error is recoverable (*) will
   9 then continue calling brcmf_fw_request_next_item for the next item again
  10 which on an error will call brcmf_fw_request_done again...
  11
  12 This does not blow up because we only have a limited number of items so
  13 we never recurse too deep. But the recursion is still quite ugly and
  14 frankly is giving me a headache, so lets fix this.
  15
  16 This commit fixes this by removing brcmf_fw_request_next_item and by
  17 making brcmf_fw_get_firmwares and brcmf_fw_request_done directly call
  18 firmware_request_nowait resp. firmware_request themselves.
  19
  20 *) brcmf_fw_request_nvram_done fallback path succeeds or
  21    BRCMF_FW_REQF_OPTIONAL is set
  22
  23 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  24 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  25 ---
  26  .../broadcom/brcm80211/brcmfmac/firmware.c         | 65 +++++++---------------
  27  1 file changed, 19 insertions(+), 46 deletions(-)
  28
  29 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
  30 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
  31 @@ -532,33 +532,6 @@ static int brcmf_fw_complete_request(con
  32         return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret;
  33  }
  34
  35 -static int brcmf_fw_request_next_item(struct brcmf_fw *fwctx, bool async)
  36 -{
  37 -       struct brcmf_fw_item *cur;
  38 -       const struct firmware *fw = NULL;
  39 -       int ret;
  40 -
  41 -       cur = &fwctx->req->items[fwctx->curpos];
  42 -
  43 -       brcmf_dbg(TRACE, "%srequest for %s\n", async ? "async " : "",
  44 -                 cur->path);
  45 -
  46 -       if (async)
  47 -               ret = request_firmware_nowait(THIS_MODULE, true, cur->path,
  48 -                                             fwctx->dev, GFP_KERNEL, fwctx,
  49 -                                             brcmf_fw_request_done);
  50 -       else
  51 -               ret = request_firmware(&fw, cur->path, fwctx->dev);
  52 -
  53 -       if (ret < 0) {
  54 -               brcmf_fw_request_done(NULL, fwctx);
  55 -       } else if (!async && fw) {
  56 -               brcmf_fw_complete_request(fw, fwctx);
  57 -               return -EAGAIN;
  58 -       }
  59 -       return 0;
  60 -}
  61 -
  62  static void brcmf_fw_request_done(const struct firmware *fw, void *ctx)
  63  {
  64         struct brcmf_fw *fwctx = ctx;
  65 @@ -568,26 +541,19 @@ static void brcmf_fw_request_done(const
  66         cur = &fwctx->req->items[fwctx->curpos];
  67
  68         ret = brcmf_fw_complete_request(fw, fwctx);
  69 -       if (ret < 0)
  70 -               goto fail;
  71 -
  72 -       do {
  73 -               if (++fwctx->curpos == fwctx->req->n_items) {
  74 -                       ret = 0;
  75 -                       goto done;
  76 -               }
  77
  78 -               ret = brcmf_fw_request_next_item(fwctx, false);
  79 -       } while (ret == -EAGAIN);
  80 -
  81 -       return;
  82 +       while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) {
  83 +               cur = &fwctx->req->items[fwctx->curpos];
  84 +               request_firmware(&fw, cur->path, fwctx->dev);
  85 +               ret = brcmf_fw_complete_request(fw, ctx);
  86 +       }
  87
  88 -fail:
  89 -       brcmf_dbg(TRACE, "failed err=%d: dev=%s, fw=%s\n", ret,
  90 -                 dev_name(fwctx->dev), cur->path);
  91 -       brcmf_fw_free_request(fwctx->req);
  92 -       fwctx->req = NULL;
  93 -done:
  94 +       if (ret) {
  95 +               brcmf_dbg(TRACE, "failed err=%d: dev=%s, fw=%s\n", ret,
  96 +                         dev_name(fwctx->dev), cur->path);
  97 +               brcmf_fw_free_request(fwctx->req);
  98 +               fwctx->req = NULL;
  99 +       }
 100         fwctx->done(fwctx->dev, ret, fwctx->req);
 101         kfree(fwctx);
 102  }
 103 @@ -611,7 +577,9 @@ int brcmf_fw_get_firmwares(struct device
 104                            void (*fw_cb)(struct device *dev, int err,
 105                                          struct brcmf_fw_request *req))
 106  {
 107 +       struct brcmf_fw_item *first = &req->items[0];
 108         struct brcmf_fw *fwctx;
 109 +       int ret;
 110
 111         brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev));
 112         if (!fw_cb)
 113 @@ -628,7 +596,12 @@ int brcmf_fw_get_firmwares(struct device
 114         fwctx->req = req;
 115         fwctx->done = fw_cb;
 116
 117 -       brcmf_fw_request_next_item(fwctx, true);
 118 +       ret = request_firmware_nowait(THIS_MODULE, true, first->path,
 119 +                                     fwctx->dev, GFP_KERNEL, fwctx,
 120 +                                     brcmf_fw_request_done);
 121 +       if (ret < 0)
 122 +               brcmf_fw_request_done(NULL, fwctx);
 123 +
 124         return 0;
 125  }
 126