From 576d28a7c73013717311cfcb514dbcae27c82eeb Mon Sep 17 00:00:00 2001 From: Larry Finger Date: Thu, 6 Dec 2012 21:55:16 -0600 Subject: [PATCH] b43legacy: Fix firmware loading when driver is built into the kernel Recent versions of udev cause synchronous firmware loading from the probe routine to fail because the request to user space times out. The original fix for b43legacy (commit a3ea2c7) moved the firmware load from the probe routine to a work queue, but it still used synchronous firmware loading. This method is OK when b43legacy is built as a module; however, it fails when the driver is compiled into the kernel. This version changes the code to load the initial firmware file using request_firmware_nowait(). A completion event is used to hold the work queue until that file is available. The remaining firmware files are read synchronously. Signed-off-by: Larry Finger Cc: Stable (V3.4+) Signed-off-by: John W. Linville --- drivers/net/wireless/b43legacy/b43legacy.h | 5 +++ drivers/net/wireless/b43legacy/main.c | 37 ++++++++++++++++++---- 2 files changed, 36 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/b43legacy/b43legacy.h b/drivers/net/wireless/b43legacy/b43legacy.h index a29da674e69d..482476fdb1f3 100644 --- a/drivers/net/wireless/b43legacy/b43legacy.h +++ b/drivers/net/wireless/b43legacy/b43legacy.h @@ -13,6 +13,7 @@ #include #include +#include #include @@ -733,6 +734,10 @@ struct b43legacy_wldev { /* Firmware data */ struct b43legacy_firmware fw; + const struct firmware *fwp; /* needed to pass fw pointer */ + + /* completion struct for firmware loading */ + struct completion fw_load_complete; /* Devicelist in struct b43legacy_wl (all 802.11 cores) */ struct list_head list; diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c index 18e208e3eca1..8c3f70e1a013 100644 --- a/drivers/net/wireless/b43legacy/main.c +++ b/drivers/net/wireless/b43legacy/main.c @@ -1513,9 +1513,17 @@ static void b43legacy_print_fw_helptext(struct b43legacy_wl *wl) "and download the correct firmware (version 3).\n"); } +static void b43legacy_fw_cb(const struct firmware *firmware, void *context) +{ + struct b43legacy_wldev *dev = context; + + dev->fwp = firmware; + complete(&dev->fw_load_complete); +} + static int do_request_fw(struct b43legacy_wldev *dev, const char *name, - const struct firmware **fw) + const struct firmware **fw, bool async) { char path[sizeof(modparam_fwpostfix) + 32]; struct b43legacy_fw_header *hdr; @@ -1528,7 +1536,24 @@ static int do_request_fw(struct b43legacy_wldev *dev, snprintf(path, ARRAY_SIZE(path), "b43legacy%s/%s.fw", modparam_fwpostfix, name); - err = request_firmware(fw, path, dev->dev->dev); + b43legacyinfo(dev->wl, "Loading firmware %s\n", path); + if (async) { + init_completion(&dev->fw_load_complete); + err = request_firmware_nowait(THIS_MODULE, 1, path, + dev->dev->dev, GFP_KERNEL, + dev, b43legacy_fw_cb); + if (err) { + b43legacyerr(dev->wl, "Unable to load firmware\n"); + return err; + } + /* stall here until fw ready */ + wait_for_completion(&dev->fw_load_complete); + if (!dev->fwp) + err = -EINVAL; + *fw = dev->fwp; + } else { + err = request_firmware(fw, path, dev->dev->dev); + } if (err) { b43legacyerr(dev->wl, "Firmware file \"%s\" not found " "or load failed.\n", path); @@ -1580,7 +1605,7 @@ static void b43legacy_request_firmware(struct work_struct *work) filename = "ucode4"; else filename = "ucode5"; - err = do_request_fw(dev, filename, &fw->ucode); + err = do_request_fw(dev, filename, &fw->ucode, true); if (err) goto err_load; } @@ -1589,7 +1614,7 @@ static void b43legacy_request_firmware(struct work_struct *work) filename = "pcm4"; else filename = "pcm5"; - err = do_request_fw(dev, filename, &fw->pcm); + err = do_request_fw(dev, filename, &fw->pcm, false); if (err) goto err_load; } @@ -1607,7 +1632,7 @@ static void b43legacy_request_firmware(struct work_struct *work) default: goto err_no_initvals; } - err = do_request_fw(dev, filename, &fw->initvals); + err = do_request_fw(dev, filename, &fw->initvals, false); if (err) goto err_load; } @@ -1627,7 +1652,7 @@ static void b43legacy_request_firmware(struct work_struct *work) default: goto err_no_initvals; } - err = do_request_fw(dev, filename, &fw->initvals_band); + err = do_request_fw(dev, filename, &fw->initvals_band, false); if (err) goto err_load; } -- 2.30.2