brcm80211: fmac: remove firmware requests from init_module syscall

As indicated in [1] on netdev mailing list drivers should not block
on the init_module() syscall. This patch defers the actual driver
registration to a workqueue so the init_module() syscall can complete
without delay.

[1] http://article.gmane.org/gmane.linux.network/217729/

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c

@@ -1181,19 +1181,29 @@ int brcmf_write_to_file(struct brcmf_pub *drvr, const u8 *buf, int size)
 }
 #endif				/* DEBUG */
 
-static int __init brcmfmac_init(void)
+static void brcmf_driver_init(struct work_struct *work)
 {
 #ifdef CONFIG_BRCMFMAC_SDIO
 	brcmf_sdio_init();
 #endif
 #ifdef CONFIG_BRCMFMAC_USB
 	brcmf_usb_init();
 #endif
+}
+static DECLARE_WORK(brcmf_driver_work, brcmf_driver_init);
+
+static int __init brcmfmac_module_init(void)
+{
+	if (!schedule_work(&brcmf_driver_work))
+		return -EBUSY;
+
 	return 0;
 }
 
-static void __exit brcmfmac_exit(void)
+static void __exit brcmfmac_module_exit(void)
 {
+	cancel_work_sync(&brcmf_driver_work);
+
 #ifdef CONFIG_BRCMFMAC_SDIO
 	brcmf_sdio_exit();
 #endif
@@ -1202,5 +1212,5 @@ static void __exit brcmfmac_exit(void)
 #endif
 }
 
-module_init(brcmfmac_init);
-module_exit(brcmfmac_exit);
+module_init(brcmfmac_module_init);
+module_exit(brcmfmac_module_exit);