rtlwifi: Convert to asynchronous firmware load

This patch addresses a kernel bugzilla report and two recent mail threads.

The kernel bugzilla report is https://bugzilla.kernel.org/show_bug.cgi?id=42632,
which reports a udev timeout on boot.

The first mail thread, which was on LKML (http://lkml.indiana.edu/hypermail/
linux/kernel/1112.3/00965.html) was for a WARNING that occurs after a
suspend/resume cycle for rtl8192cu.

The scond mail thread (http://marc.info/?l=linux-wireless&m=132655490826766&w=2)
concerned changes in udev that break drivers that delay while firmware is loaded
on modprobe.

This patch converts all rtlwifi-based drivers to use the asynchronous firmware
loading mechanism. Drivers rtl8192ce, rtl8192cu and rtl8192de share a common
callback routine. Driver rtl8192se needs different handling of the firmware,
thus it has its own code.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 25 insertions, 39 deletions

diff --git a/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c b/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
index 7f17168..0c74d4f 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
@@ -997,10 +997,7 @@ int rtl92cu_hw_init(struct ieee80211_hw *hw)
 		RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
 			 "Failed to download FW. Init HW without FW now..\n");
 		err = 1;
-		rtlhal->fw_ready = false;
 		return err;
-	} else {
-		rtlhal->fw_ready = true;
 	}
 	rtlhal->last_hmeboxnum = 0; /* h2c */
 	_rtl92cu_phy_param_tab_init(hw);
@@ -1094,23 +1091,21 @@ static void  _ResetDigitalProcedure1(struct ieee80211_hw *hw, bool bWithoutHWSM)
 		if (rtl_read_byte(rtlpriv, REG_MCUFWDL) & BIT(1)) {
 			/* reset MCU ready status */
 			rtl_write_byte(rtlpriv, REG_MCUFWDL, 0);
-			if (rtlhal->fw_ready) {
-				/* 8051 reset by self */
-				rtl_write_byte(rtlpriv, REG_HMETFR+3, 0x20);
-				while ((retry_cnts++ < 100) &&
-				       (FEN_CPUEN & rtl_read_word(rtlpriv,
-				       REG_SYS_FUNC_EN))) {
-					udelay(50);
-				}
-				if (retry_cnts >= 100) {
-					RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
-						 "#####=> 8051 reset failed!.........................\n");
-					/* if 8051 reset fail, reset MAC. */
-					rtl_write_byte(rtlpriv,
-						       REG_SYS_FUNC_EN + 1,
-						       0x50);
-					udelay(100);
-				}
+			/* 8051 reset by self */
+			rtl_write_byte(rtlpriv, REG_HMETFR+3, 0x20);
+			while ((retry_cnts++ < 100) &&
+			       (FEN_CPUEN & rtl_read_word(rtlpriv,
+			       REG_SYS_FUNC_EN))) {
+				udelay(50);
+			}
+			if (retry_cnts >= 100) {
+				RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
+					 "#####=> 8051 reset failed!.........................\n");
+				/* if 8051 reset fail, reset MAC. */
+				rtl_write_byte(rtlpriv,
+					       REG_SYS_FUNC_EN + 1,
+					       0x50);
+				udelay(100);
 			}
 		}
 		/* Reset MAC and Enable 8051 */
diff --git a/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c b/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c
index c04c3be..82c85286 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192cu/sw.c
@@ -53,7 +53,6 @@ MODULE_FIRMWARE("rtlwifi/rtl8192cufw.bin");
 static int rtl92cu_init_sw_vars(struct ieee80211_hw *hw)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
-	const struct firmware *firmware;
 	int err;
 
 	rtlpriv->dm.dm_initialgain_enable = true;
@@ -61,29 +60,21 @@ static int rtl92cu_init_sw_vars(struct ieee80211_hw *hw)
 	rtlpriv->dm.disable_framebursting = false;
 	rtlpriv->dm.thermalvalue = 0;
 	rtlpriv->dbg.global_debuglevel = rtlpriv->cfg->mod_params->debug;
-	rtlpriv->rtlhal.pfirmware = vmalloc(0x4000);
+
+	/* for firmware buf */
+	rtlpriv->rtlhal.pfirmware = vzalloc(0x4000);
 	if (!rtlpriv->rtlhal.pfirmware) {
 		RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
 			 "Can't alloc buffer for fw\n");
 		return 1;
 	}
-	/* request fw */
-	err = request_firmware(&firmware, rtlpriv->cfg->fw_name,
-			rtlpriv->io.dev);
-	if (err) {
-		RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
-			 "Failed to request firmware!\n");
-		return 1;
-	}
-	if (firmware->size > 0x4000) {
-		RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
-			 "Firmware is too big!\n");
-		release_firmware(firmware);
-		return 1;
-	}
-	memcpy(rtlpriv->rtlhal.pfirmware, firmware->data, firmware->size);
-	rtlpriv->rtlhal.fwsize = firmware->size;
-	release_firmware(firmware);
+
+	pr_info("Loading firmware %s\n", rtlpriv->cfg->fw_name);
+	rtlpriv->max_fw_size = 0x4000;
+	err = request_firmware_nowait(THIS_MODULE, 1,
+				      rtlpriv->cfg->fw_name, rtlpriv->io.dev,
+				      GFP_KERNEL, hw, rtl_fw_cb);
+
 
 	return 0;
 }