orinoco: cache downloadable firmware image in memory for use during resume

If card is using downloadable firmware (like Agere 9.x), firmware has
to be reloaded during resume. It is not possible to use request_firmware
for that, because tasks are still frozen, so request_firmware will
just timeout and fail. So cache firmware image in memory for later
reuse in ->resume method.
Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/orinoco.c

@@ -487,12 +487,17 @@ orinoco_dl_firmware(struct orinoco_private *priv,
 	if (err)
 		goto free;
 
-	err = request_firmware(&fw_entry, firmware, priv->dev);
-	if (err) {
-		printk(KERN_ERR "%s: Cannot find firmware %s\n",
-		       dev->name, firmware);
-		err = -ENOENT;
-		goto free;
+	if (priv->cached_fw)
+		fw_entry = priv->cached_fw;
+	else {
+		err = request_firmware(&fw_entry, firmware, priv->dev);
+		if (err) {
+			printk(KERN_ERR "%s: Cannot find firmware %s\n",
+			       dev->name, firmware);
+			err = -ENOENT;
+			goto free;
+		}
+		priv->cached_fw = fw_entry;
 	}
 
 	hdr = (const struct orinoco_fw_header *) fw_entry->data;
@@ -535,7 +540,11 @@ orinoco_dl_firmware(struct orinoco_private *priv,
 	       dev->name, hermes_present(hw));
 
 abort:
-	release_firmware(fw_entry);
+	/* In case of error, assume firmware was bogus and release it */
+	if (err) {
+		priv->cached_fw = NULL;
+		release_firmware(fw_entry);
+	}
 
 free:
 	kfree(pda);
@@ -3532,6 +3541,8 @@ struct net_device
 	netif_carrier_off(dev);
 	priv->last_linkstatus = 0xffff;
 
+	priv->cached_fw = NULL;
+
 	return dev;
 }
 
@@ -3543,6 +3554,9 @@ void free_orinocodev(struct net_device *dev)
 	 * when we call tasklet_kill it will run one final time,
 	 * emptying the list */
 	tasklet_kill(&priv->rx_tasklet);
+	if (priv->cached_fw)
+		release_firmware(priv->cached_fw);
+	priv->cached_fw = NULL;
 	priv->wpa_ie_len = 0;
 	kfree(priv->wpa_ie);
 	orinoco_mic_free(priv);

drivers/net/wireless/orinoco.h

@@ -66,6 +66,8 @@ struct orinoco_rx_data {
 	struct list_head list;
 };
 
+struct firmware;
+
 struct orinoco_private {
 	void *card;	/* Pointer to card dependent structure */
 	struct device *dev;
@@ -164,6 +166,9 @@ struct orinoco_private {
 	unsigned int wpa_enabled:1;
 	unsigned int tkip_cm_active:1;
 	unsigned int key_mgmt:3;
+
+	/* Cached in memory firmware to use in ->resume */
+	const struct firmware *cached_fw;
 };
 
 #ifdef ORINOCO_DEBUG