1 files changed, 91 insertions, 81 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 6aeb82b6992..8b8e3e1cbb4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -31,6 +31,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/pci.h>
+#include <linux/slab.h>
 #include <linux/dma-mapping.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
@@ -1258,7 +1259,15 @@ static void iwl_irq_tasklet(struct iwl_priv *priv)
 	/* Ack/clear/reset pending uCode interrupts.
 	 * Note:  Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS,
 	 */
-	iwl_write32(priv, CSR_INT, priv->inta);
+	/* There is a hardware bug in the interrupt mask function that some
+	 * interrupts (i.e. CSR_INT_BIT_SCD) can still be generated even if
+	 * they are disabled in the CSR_INT_MASK register. Furthermore the
+	 * ICT interrupt handling mechanism has another bug that might cause
+	 * these unmasked interrupts fail to be detected. We workaround the
+	 * hardware bugs here by ACKing all the possible interrupts so that
+	 * interrupt coalescing can still be achieved.
+	 */
+	iwl_write32(priv, CSR_INT, priv->inta | ~priv->inta_mask);
 
 	inta = priv->inta;
 
@@ -1463,59 +1472,66 @@ static void iwl_nic_start(struct iwl_priv *priv)
 }
 
 
+static void iwl_ucode_callback(const struct firmware *ucode_raw, void *context);
+static int iwl_mac_setup_register(struct iwl_priv *priv);
+
+static int __must_check iwl_request_firmware(struct iwl_priv *priv, bool first)
+{
+	const char *name_pre = priv->cfg->fw_name_pre;
+
+	if (first)
+		priv->fw_index = priv->cfg->ucode_api_max;
+	else
+		priv->fw_index--;
+
+	if (priv->fw_index < priv->cfg->ucode_api_min) {
+		IWL_ERR(priv, "no suitable firmware found!\n");
+		return -ENOENT;
+	}
+
+	sprintf(priv->firmware_name, "%s%d%s",
+		name_pre, priv->fw_index, ".ucode");
+
+	IWL_DEBUG_INFO(priv, "attempting to load firmware '%s'\n",
+		       priv->firmware_name);
+
+	return request_firmware_nowait(THIS_MODULE, 1, priv->firmware_name,
+				       &priv->pci_dev->dev, GFP_KERNEL, priv,
+				       iwl_ucode_callback);
+}
+
 /**
- * iwl_read_ucode - Read uCode images from disk file.
+ * iwl_ucode_callback - callback when firmware was loaded
  *
- * Copy into buffers for card to fetch via bus-mastering
+ * If loaded successfully, copies the firmware into buffers
+ * for the card to fetch (via DMA).
  */
-static int iwl_read_ucode(struct iwl_priv *priv)
+static void iwl_ucode_callback(const struct firmware *ucode_raw, void *context)
 {
+	struct iwl_priv *priv = context;
 	struct iwl_ucode_header *ucode;
-	int ret = -EINVAL, index;
-	const struct firmware *ucode_raw;
-	const char *name_pre = priv->cfg->fw_name_pre;
 	const unsigned int api_max = priv->cfg->ucode_api_max;
 	const unsigned int api_min = priv->cfg->ucode_api_min;
-	char buf[25];
 	u8 *src;
 	size_t len;
 	u32 api_ver, build;
 	u32 inst_size, data_size, init_size, init_data_size, boot_size;
+	int err;
 	u16 eeprom_ver;
 
-	/* Ask kernel firmware_class module to get the boot firmware off disk.
-	 * request_firmware() is synchronous, file is in memory on return. */
-	for (index = api_max; index >= api_min; index--) {
-		sprintf(buf, "%s%d%s", name_pre, index, ".ucode");
-		ret = request_firmware(&ucode_raw, buf, &priv->pci_dev->dev);
-		if (ret < 0) {
-			IWL_ERR(priv, "%s firmware file req failed: %d\n",
-				  buf, ret);
-			if (ret == -ENOENT)
-				continue;
-			else
-				goto error;
-		} else {
-			if (index < api_max)
-				IWL_ERR(priv, "Loaded firmware %s, "
-					"which is deprecated. "
-					"Please use API v%u instead.\n",
-					  buf, api_max);
-
-			IWL_DEBUG_INFO(priv, "Got firmware '%s' file (%zd bytes) from disk\n",
-				       buf, ucode_raw->size);
-			break;
-		}
+	if (!ucode_raw) {
+		IWL_ERR(priv, "request for firmware file '%s' failed.\n",
+			priv->firmware_name);
+		goto try_again;
 	}
 
-	if (ret < 0)
-		goto error;
+	IWL_DEBUG_INFO(priv, "Loaded firmware file '%s' (%zd bytes).\n",
+		       priv->firmware_name, ucode_raw->size);
 
 	/* Make sure that we got at least the v1 header! */
 	if (ucode_raw->size < priv->cfg->ops->ucode->get_header_size(1)) {
 		IWL_ERR(priv, "File size way too small!\n");
-		ret = -EINVAL;
-		goto err_release;
+		goto try_again;
 	}
 
 	/* Data from ucode file:  header followed by uCode images */
@@ -1540,10 +1556,9 @@ static int iwl_read_ucode(struct iwl_priv *priv)
 		IWL_ERR(priv, "Driver unable to support your firmware API. "
 			  "Driver supports v%u, firmware is v%u.\n",
 			  api_max, api_ver);
-		priv->ucode_ver = 0;
-		ret = -EINVAL;
-		goto err_release;
+		goto try_again;
 	}
+
 	if (api_ver != api_max)
 		IWL_ERR(priv, "Firmware has old API version. Expected v%u, "
 			  "got v%u. New firmware can be obtained "
@@ -1585,6 +1600,12 @@ static int iwl_read_ucode(struct iwl_priv *priv)
 	IWL_DEBUG_INFO(priv, "f/w package hdr boot inst size = %u\n",
 		       boot_size);
 
+	/*
+	 * For any of the failures below (before allocating pci memory)
+	 * we will try to load a version with a smaller API -- maybe the
+	 * user just got a corrupted version of the latest API.
+	 */
+
 	/* Verify size of file vs. image size info in file's header */
 	if (ucode_raw->size !=
 		priv->cfg->ops->ucode->get_header_size(api_ver) +
@@ -1594,41 +1615,35 @@ static int iwl_read_ucode(struct iwl_priv *priv)
 		IWL_DEBUG_INFO(priv,
 			"uCode file size %d does not match expected size\n",
 			(int)ucode_raw->size);
-		ret = -EINVAL;
-		goto err_release;
+		goto try_again;
 	}
 
 	/* Verify that uCode images will fit in card's SRAM */
 	if (inst_size > priv->hw_params.max_inst_size) {
 		IWL_DEBUG_INFO(priv, "uCode instr len %d too large to fit in\n",
 			       inst_size);
-		ret = -EINVAL;
-		goto err_release;
+		goto try_again;
 	}
 
 	if (data_size > priv->hw_params.max_data_size) {
 		IWL_DEBUG_INFO(priv, "uCode data len %d too large to fit in\n",
 				data_size);
-		ret = -EINVAL;
-		goto err_release;
+		goto try_again;
 	}
 	if (init_size > priv->hw_params.max_inst_size) {
 		IWL_INFO(priv, "uCode init instr len %d too large to fit in\n",
 			init_size);
-		ret = -EINVAL;
-		goto err_release;
+		goto try_again;
 	}
 	if (init_data_size > priv->hw_params.max_data_size) {
 		IWL_INFO(priv, "uCode init data len %d too large to fit in\n",
 		      init_data_size);
-		ret = -EINVAL;
-		goto err_release;
+		goto try_again;
 	}
 	if (boot_size > priv->hw_params.max_bsm_size) {
 		IWL_INFO(priv, "uCode boot instr len %d too large to fit in\n",
 			boot_size);
-		ret = -EINVAL;
-		goto err_release;
+		goto try_again;
 	}
 
 	/* Allocate ucode buffers for card's bus-master loading ... */
@@ -1712,20 +1727,36 @@ static int iwl_read_ucode(struct iwl_priv *priv)
 	IWL_DEBUG_INFO(priv, "Copying (but not loading) boot instr len %Zd\n", len);
 	memcpy(priv->ucode_boot.v_addr, src, len);
 
+	/**************************************************
+	 * This is still part of probe() in a sense...
+	 *
+	 * 9. Setup and register with mac80211 and debugfs
+	 **************************************************/
+	err = iwl_mac_setup_register(priv);
+	if (err)
+		goto out_unbind;
+
+	err = iwl_dbgfs_register(priv, DRV_NAME);
+	if (err)
+		IWL_ERR(priv, "failed to create debugfs files. Ignoring error: %d\n", err);
+
 	/* We have our copies now, allow OS release its copies */
 	release_firmware(ucode_raw);
-	return 0;
+	return;
+
+ try_again:
+	/* try next, if any */
+	if (iwl_request_firmware(priv, false))
+		goto out_unbind;
+	release_firmware(ucode_raw);
+	return;
 
  err_pci_alloc:
 	IWL_ERR(priv, "failed to allocate pci memory\n");
-	ret = -ENOMEM;
 	iwl_dealloc_ucode_pci(priv);
-
- err_release:
+ out_unbind:
+	device_release_driver(&priv->pci_dev->dev);
 	release_firmware(ucode_raw);
-
- error:
-	return ret;
 }
 
 static const char *desc_lookup_text[] = {
@@ -2622,7 +2653,7 @@ static int iwl_mac_setup_register(struct iwl_priv *priv)
 		BIT(NL80211_IFTYPE_STATION) |
 		BIT(NL80211_IFTYPE_ADHOC);
 
-	hw->wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY |
+	hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY |
 			    WIPHY_FLAG_DISABLE_BEACON_HINTS;
 
 	/*
@@ -2631,7 +2662,7 @@ static int iwl_mac_setup_register(struct iwl_priv *priv)
 	 */
 	hw->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 
-	hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX + 1;
+	hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX;
 	/* we create the 802.11 header and a zero-length SSID element */
 	hw->wiphy->max_scan_ie_len = IWL_MAX_PROBE_REQUEST - 24 - 2;
 
@@ -2667,21 +2698,7 @@ static int iwl_mac_start(struct ieee80211_hw *hw)
 
 	/* we should be verifying the device is ready to be opened */
 	mutex_lock(&priv->mutex);
-
-	/* fetch ucode file from disk, alloc and copy to bus-master buffers ...
-	 * ucode filename and max sizes are card-specific. */
-
-	if (!priv->ucode_code.len) {
-		ret = iwl_read_ucode(priv);
-		if (ret) {
-			IWL_ERR(priv, "Could not read microcode: %d\n", ret);
-			mutex_unlock(&priv->mutex);
-			return ret;
-		}
-	}
-
 	ret = __iwl_up(priv);
-
 	mutex_unlock(&priv->mutex);
 
 	if (ret)
@@ -3654,17 +3671,10 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	iwl_power_initialize(priv);
 	iwl_tt_initialize(priv);
 
-	/**************************************************
-	 * 9. Setup and register with mac80211 and debugfs
-	 **************************************************/
-	err = iwl_mac_setup_register(priv);
+	err = iwl_request_firmware(priv, true);
 	if (err)
 		goto out_remove_sysfs;
 
-	err = iwl_dbgfs_register(priv, DRV_NAME);
-	if (err)
-		IWL_ERR(priv, "failed to create debugfs files. Ignoring error: %d\n", err);
-
 	return 0;
 
  out_remove_sysfs: