Patch: Init/shutdown correctness fixes for drivers/cbus/tahvo*

[Andrew de Quincey <adq_dvb@xxxxxxxxxxxxx>]

This is a companion review patch to the cbus one that fixes  
init/shutdown correctness in drivers/cbus/tahvo*

commit 76dfa5c81201df2340e4f5902a4552dea449d771
Author: Andrew de Quincey <adq@xxxxxxxxxxxxx>
Date:   Tue May 26 00:13:21 2009 +0100

    Fix tahvo errors

diff --git a/drivers/cbus/tahvo-usb.c b/drivers/cbus/tahvo-usb.c
index df74d28..5f70c44 100644
--- a/drivers/cbus/tahvo-usb.c
+++ b/drivers/cbus/tahvo-usb.c
@@ -651,10 +651,9 @@ static int tahvo_usb_probe(struct platform_device *pdev)
 	dev_dbg(&(pdev->dev), "probe\n");
 
 	/* Create driver data */
-	tu = kmalloc(sizeof(*tu), GFP_KERNEL);
+	tu = kzalloc(sizeof(*tu), GFP_KERNEL);
 	if (!tu)
 		return -ENOMEM;
-	memset(tu, 0, sizeof(*tu));
 	tu->pt_dev = pdev;
 #ifdef CONFIG_USB_OTG
 	/* Default mode */
@@ -683,11 +682,23 @@ static int tahvo_usb_probe(struct platform_device *pdev)
 
 	/* Attributes */
 	ret = device_create_file(&(pdev->dev), &dev_attr_vbus_state);
+	if (ret) {
+		tahvo_free_irq(TAHVO_INT_VBUSON);
+		kfree(tu);
+		printk(KERN_ERR "attribute creation failed: %d\n", ret);
+		return ret;
+	}
+
 #ifdef CONFIG_USB_OTG
-	ret |= device_create_file(&(pdev->dev), &dev_attr_otg_mode);
-#endif
-	if (ret)
+	ret = device_create_file(&(pdev->dev), &dev_attr_otg_mode);
+	if (ret) {
+		device_remove_file(&(pdev->dev), &dev_attr_vbus_state);
+		tahvo_free_irq(TAHVO_INT_VBUSON);
+		kfree(tu);
 		printk(KERN_ERR "attribute creation failed: %d\n", ret);
+		return ret;
+	}
+#endif
 
 	/* Create OTG interface */
 	tahvo_usb_power_off(tu);
@@ -703,8 +714,12 @@ static int tahvo_usb_probe(struct platform_device *pdev)
 	ret = otg_set_transceiver(&tu->otg);
 	if (ret < 0) {
 		printk(KERN_ERR "Cannot register USB transceiver\n");
-		kfree(tu);
 		tahvo_free_irq(TAHVO_INT_VBUSON);
+		device_remove_file(&(pdev->dev), &dev_attr_vbus_state);
+#ifdef CONFIG_USB_OTG
+		device_remove_file(&(pdev->dev), &dev_attr_otg_mode);
+#endif
+		kfree(tu);
 		return ret;
 	}
 
@@ -718,6 +733,7 @@ static int tahvo_usb_probe(struct platform_device *pdev)
 
 static int tahvo_usb_remove(struct platform_device *pdev)
 {
+	struct tahvo_usb *tu = (struct tahvo_usb*) pdev->dev.driver_data;
 	dev_dbg(&(pdev->dev), "remove\n");
 
 	tahvo_free_irq(TAHVO_INT_VBUSON);
@@ -727,6 +743,7 @@ static int tahvo_usb_remove(struct platform_device *pdev)
 #ifdef CONFIG_USB_OTG
 	device_remove_file(&(pdev->dev), &dev_attr_otg_mode);
 #endif
+	kfree(tu);
 	return 0;
 }
 
diff --git a/drivers/cbus/tahvo.c b/drivers/cbus/tahvo.c
index 29fd4b8..09a69c0 100644
--- a/drivers/cbus/tahvo.c
+++ b/drivers/cbus/tahvo.c
@@ -298,6 +298,7 @@ static int __devinit tahvo_probe(struct platform_device *pdev)
 	em_asic_config = omap_get_config(OMAP_TAG_EM_ASIC_BB5,
 					 struct omap_em_asic_bb5_config);
 	if (em_asic_config == NULL) {
+		tasklet_kill(&tahvo_tasklet);
 		printk(KERN_ERR PFX "Unable to retrieve config data\n");
 		return -ENODATA;
 	}
@@ -314,6 +315,7 @@ static int __devinit tahvo_probe(struct platform_device *pdev)
 		tahvo_is_betty = 1;
 		tahvo_7bit_backlight = 1;
 	} else {
+		tasklet_kill(&tahvo_tasklet);
 		printk(KERN_ERR "Tahvo/Betty chip not found");
 		return -ENODEV;
 	}
@@ -324,6 +326,7 @@ static int __devinit tahvo_probe(struct platform_device *pdev)
 	tahvo_irq_pin = em_asic_config->tahvo_irq_gpio;
 
 	if ((ret = gpio_request(tahvo_irq_pin, "TAHVO irq")) < 0) {
+		tasklet_kill(&tahvo_tasklet);
 		printk(KERN_ERR PFX "Unable to reserve IRQ GPIO\n");
 		return ret;
 	}
@@ -342,6 +345,7 @@ static int __devinit tahvo_probe(struct platform_device *pdev)
 	if (ret < 0) {
 		printk(KERN_ERR PFX "Unable to register IRQ handler\n");
 		gpio_free(tahvo_irq_pin);
+		tasklet_kill(&tahvo_tasklet);
 		return ret;
 	}
 #ifdef CONFIG_CBUS_TAHVO_USER
@@ -350,6 +354,7 @@ static int __devinit tahvo_probe(struct platform_device *pdev)
 		printk(KERN_ERR "Unable to initialize driver\n");
 		free_irq(gpio_to_irq(tahvo_irq_pin), 0);
 		gpio_free(tahvo_irq_pin);
+		tasklet_kill(&tahvo_tasklet);
 		return ret;
 	}
 #endif