V4L/DVB (4854): Handle errors from input_register_device()

Also sprinkled some input_sync() throughout the code.
Acked-by: Ricardo Cerqueira <v4l@cerqueira.org>
Acked-by: Oliver Endriss <o.endriss@gmx.de>
Acked-by: Andrew de Quincey <adq_dvb@lidskialf.net>

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

5 files changed, 172 insertions, 106 deletions

diff --git a/drivers/media/video/bt8xx/bttv-input.c b/drivers/media/video/bt8xx/bttv-input.c
index 933d6db..cbc012f 100644
--- a/drivers/media/video/bt8xx/bttv-input.c
+++ b/drivers/media/video/bt8xx/bttv-input.c
@@ -259,24 +259,59 @@ static void bttv_rc5_timer_keyup(unsigned long data)
 
 /* ---------------------------------------------------------------------- */
 
+static void bttv_ir_start(struct bttv *btv, struct bttv_ir *ir)
+{
+	if (ir->polling) {
+		init_timer(&ir->timer);
+		ir->timer.function = bttv_input_timer;
+		ir->timer.data     = (unsigned long)btv;
+		ir->timer.expires  = jiffies + HZ;
+		add_timer(&ir->timer);
+	} else if (ir->rc5_gpio) {
+		/* set timer_end for code completion */
+		init_timer(&ir->timer_end);
+		ir->timer_end.function = bttv_rc5_timer_end;
+		ir->timer_end.data = (unsigned long)ir;
+
+		init_timer(&ir->timer_keyup);
+		ir->timer_keyup.function = bttv_rc5_timer_keyup;
+		ir->timer_keyup.data = (unsigned long)ir;
+	}
+}
+
+static void bttv_ir_stop(struct bttv *btv)
+{
+	if (btv->remote->polling) {
+		del_timer_sync(&btv->remote->timer);
+		flush_scheduled_work();
+	}
+
+	if (btv->remote->rc5_gpio) {
+		u32 gpio;
+
+		del_timer_sync(&btv->remote->timer_end);
+		flush_scheduled_work();
+
+		gpio = bttv_gpio_read(&btv->c);
+		bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
+	}
+}
+
 int bttv_input_init(struct bttv *btv)
 {
 	struct bttv_ir *ir;
 	IR_KEYTAB_TYPE *ir_codes = NULL;
 	struct input_dev *input_dev;
 	int ir_type = IR_TYPE_OTHER;
+	int err = -ENOMEM;
 
 	if (!btv->has_remote)
 		return -ENODEV;
 
 	ir = kzalloc(sizeof(*ir),GFP_KERNEL);
 	input_dev = input_allocate_device();
-	if (!ir || !input_dev) {
-		kfree(ir);
-		input_free_device(input_dev);
-		return -ENOMEM;
-	}
-	memset(ir,0,sizeof(*ir));
+	if (!ir || !input_dev)
+		goto err_out_free;
 
 	/* detect & configure */
 	switch (btv->c.type) {
@@ -348,10 +383,9 @@ int bttv_input_init(struct bttv *btv)
 		break;
 	}
 	if (NULL == ir_codes) {
-		dprintk(KERN_INFO "Ooops: IR config error [card=%d]\n",btv->c.type);
-		kfree(ir);
-		input_free_device(input_dev);
-		return -ENODEV;
+		dprintk(KERN_INFO "Ooops: IR config error [card=%d]\n", btv->c.type);
+		err = -ENODEV;
+		goto err_out_free;
 	}
 
 	if (ir->rc5_gpio) {
@@ -389,32 +423,26 @@ int bttv_input_init(struct bttv *btv)
 	input_dev->cdev.dev = &btv->c.pci->dev;
 
 	btv->remote = ir;
-	if (ir->polling) {
-		init_timer(&ir->timer);
-		ir->timer.function = bttv_input_timer;
-		ir->timer.data     = (unsigned long)btv;
-		ir->timer.expires  = jiffies + HZ;
-		add_timer(&ir->timer);
-	} else if (ir->rc5_gpio) {
-		/* set timer_end for code completion */
-		init_timer(&ir->timer_end);
-		ir->timer_end.function = bttv_rc5_timer_end;
-		ir->timer_end.data = (unsigned long)ir;
-
-		init_timer(&ir->timer_keyup);
-		ir->timer_keyup.function = bttv_rc5_timer_keyup;
-		ir->timer_keyup.data = (unsigned long)ir;
-	}
+	bttv_ir_start(btv, ir);
 
 	/* all done */
-	input_register_device(btv->remote->dev);
-	printk(DEVNAME ": %s detected at %s\n",ir->name,ir->phys);
+	err = input_register_device(btv->remote->dev);
+	if (err)
+		goto err_out_stop;
 
 	/* the remote isn't as bouncy as a keyboard */
 	ir->dev->rep[REP_DELAY] = repeat_delay;
 	ir->dev->rep[REP_PERIOD] = repeat_period;
 
 	return 0;
+
+ err_out_stop:
+	bttv_ir_stop(btv);
+	btv->remote = NULL;
+ err_out_free:
+	input_free_device(input_dev);
+	kfree(ir);
+	return err;
 }
 
 void bttv_input_fini(struct bttv *btv)
@@ -422,22 +450,7 @@ void bttv_input_fini(struct bttv *btv)
 	if (btv->remote == NULL)
 		return;
 
-	if (btv->remote->polling) {
-		del_timer_sync(&btv->remote->timer);
-		flush_scheduled_work();
-	}
-
-
-	if (btv->remote->rc5_gpio) {
-		u32 gpio;
-
-		del_timer_sync(&btv->remote->timer_end);
-		flush_scheduled_work();
-
-		gpio = bttv_gpio_read(&btv->c);
-		bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
-	}
-
+	bttv_ir_stop(btv);
 	input_unregister_device(btv->remote->dev);
 	kfree(btv->remote);
 	btv->remote = NULL;
diff --git a/drivers/media/video/cx88/cx88-input.c b/drivers/media/video/cx88/cx88-input.c
index e60a0a5..c6d412b 100644
--- a/drivers/media/video/cx88/cx88-input.c
+++ b/drivers/media/video/cx88/cx88-input.c
@@ -155,6 +155,35 @@ static void cx88_ir_work(struct work_struct *work)
 	mod_timer(&ir->timer, timeout);
 }
 
+static void cx88_ir_start(struct cx88_core *core, struct cx88_IR *ir)
+{
+	if (ir->polling) {
+		INIT_WORK(&ir->work, cx88_ir_work, ir);
+		init_timer(&ir->timer);
+		ir->timer.function = ir_timer;
+		ir->timer.data = (unsigned long)ir;
+		schedule_work(&ir->work);
+	}
+	if (ir->sampling) {
+		core->pci_irqmask |= (1 << 18);	/* IR_SMP_INT */
+		cx_write(MO_DDS_IO, 0xa80a80);	/* 4 kHz sample rate */
+		cx_write(MO_DDSCFG_IO, 0x5);	/* enable */
+	}
+}
+
+static void cx88_ir_stop(struct cx88_core *core, struct cx88_IR *ir)
+{
+	if (ir->sampling) {
+		cx_write(MO_DDSCFG_IO, 0x0);
+		core->pci_irqmask &= ~(1 << 18);
+	}
+
+	if (ir->polling) {
+		del_timer_sync(&ir->timer);
+		flush_scheduled_work();
+	}
+}
+
 /* ---------------------------------------------------------------------- */
 
 int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci)
@@ -163,14 +192,12 @@ int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci)
 	struct input_dev *input_dev;
 	IR_KEYTAB_TYPE *ir_codes = NULL;
 	int ir_type = IR_TYPE_OTHER;
+	int err = -ENOMEM;
 
 	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 	input_dev = input_allocate_device();
-	if (!ir || !input_dev) {
-		kfree(ir);
-		input_free_device(input_dev);
-		return -ENOMEM;
-	}
+	if (!ir || !input_dev)
+		goto err_out_free;
 
 	ir->input = input_dev;
 
@@ -280,9 +307,8 @@ int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci)
 	}
 
 	if (NULL == ir_codes) {
-		kfree(ir);
-		input_free_device(input_dev);
-		return -ENODEV;
+		err = -ENODEV;
+		goto err_out_free;
 	}
 
 	/* init input device */
@@ -307,23 +333,22 @@ int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci)
 	ir->core = core;
 	core->ir = ir;
 
-	if (ir->polling) {
-		INIT_WORK(&ir->work, cx88_ir_work);
-		init_timer(&ir->timer);
-		ir->timer.function = ir_timer;
-		ir->timer.data = (unsigned long)ir;
-		schedule_work(&ir->work);
-	}
-	if (ir->sampling) {
-		core->pci_irqmask |= (1 << 18);	/* IR_SMP_INT */
-		cx_write(MO_DDS_IO, 0xa80a80);	/* 4 kHz sample rate */
-		cx_write(MO_DDSCFG_IO, 0x5);	/* enable */
-	}
+	cx88_ir_start(core, ir);
 
 	/* all done */
-	input_register_device(ir->input);
+	err = input_register_device(ir->input);
+	if (err)
+		goto err_out_stop;
 
 	return 0;
+
+ err_out_stop:
+	cx88_ir_stop(core, ir);
+	core->ir = NULL;
+ err_out_free:
+	input_free_device(input_dev);
+	kfree(ir);
+	return err;
 }
 
 int cx88_ir_fini(struct cx88_core *core)
@@ -334,15 +359,7 @@ int cx88_ir_fini(struct cx88_core *core)
 	if (NULL == ir)
 		return 0;
 
-	if (ir->sampling) {
-		cx_write(MO_DDSCFG_IO, 0x0);
-		core->pci_irqmask &= ~(1 << 18);
-	}
-	if (ir->polling) {
-		del_timer(&ir->timer);
-		flush_scheduled_work();
-	}
-
+	cx88_ir_stop(core, ir);
 	input_unregister_device(ir->input);
 	kfree(ir);
 
diff --git a/drivers/media/video/ir-kbd-i2c.c b/drivers/media/video/ir-kbd-i2c.c
index ab87e7b..dd6341f 100644
--- a/drivers/media/video/ir-kbd-i2c.c
+++ b/drivers/media/video/ir-kbd-i2c.c
@@ -305,15 +305,14 @@ static int ir_attach(struct i2c_adapter *adap, int addr,
 	int ir_type;
 	struct IR_i2c *ir;
 	struct input_dev *input_dev;
+	int err;
 
 	ir = kzalloc(sizeof(struct IR_i2c),GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!ir || !input_dev) {
-		input_free_device(input_dev);
-		kfree(ir);
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto err_out_free;
 	}
-	memset(ir,0,sizeof(*ir));
 
 	ir->c = client_template;
 	ir->input = input_dev;
@@ -361,26 +360,27 @@ static int ir_attach(struct i2c_adapter *adap, int addr,
 		break;
 	default:
 		/* shouldn't happen */
-		printk(DEVNAME ": Huh? unknown i2c address (0x%02x)?\n",addr);
-		kfree(ir);
-		return -1;
+		printk(DEVNAME ": Huh? unknown i2c address (0x%02x)?\n", addr);
+		err = -ENODEV;
+		goto err_out_free;
 	}
 
 	/* Sets name */
 	snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (%s)", name);
-	ir->ir_codes=ir_codes;
+	ir->ir_codes = ir_codes;
 
 	/* register i2c device
 	 * At device register, IR codes may be changed to be
 	 * board dependent.
 	 */
-	i2c_attach_client(&ir->c);
+	err = i2c_attach_client(&ir->c);
+	if (err)
+		goto err_out_free;
 
 	/* If IR not supported or disabled, unregisters driver */
 	if (ir->get_key == NULL) {
-		i2c_detach_client(&ir->c);
-		kfree(ir);
-		return -1;
+		err = -ENODEV;
+		goto err_out_detach;
 	}
 
 	/* Phys addr can only be set after attaching (for ir->c.dev.bus_id) */
@@ -389,15 +389,17 @@ static int ir_attach(struct i2c_adapter *adap, int addr,
 		 ir->c.dev.bus_id);
 
 	/* init + register input device */
-	ir_input_init(input_dev,&ir->ir,ir_type,ir->ir_codes);
+	ir_input_init(input_dev, &ir->ir, ir_type, ir->ir_codes);
 	input_dev->id.bustype = BUS_I2C;
 	input_dev->name       = ir->c.name;
 	input_dev->phys       = ir->phys;
 
-	/* register event device */
-	input_register_device(ir->input);
+	err = input_register_device(ir->input);
+	if (err)
+		goto err_out_detach;
+
 	printk(DEVNAME ": %s detected at %s [%s]\n",
-	       ir->input->name,ir->input->phys,adap->name);
+	       ir->input->name, ir->input->phys, adap->name);
 
 	/* start polling via eventd */
 	INIT_WORK(&ir->work, ir_work);
@@ -407,6 +409,13 @@ static int ir_attach(struct i2c_adapter *adap, int addr,
 	schedule_work(&ir->work);
 
 	return 0;
+
+ err_out_detach:
+	i2c_detach_client(&ir->c);
+ err_out_free:
+	input_free_device(input_dev);
+	kfree(ir);
+	return err;
 }
 
 static int ir_detach(struct i2c_client *client)
@@ -414,7 +423,7 @@ static int ir_detach(struct i2c_client *client)
 	struct IR_i2c *ir = i2c_get_clientdata(client);
 
 	/* kill outstanding polls */
-	del_timer(&ir->timer);
+	del_timer_sync(&ir->timer);
 	flush_scheduled_work();
 
 	/* unregister devices */
diff --git a/drivers/media/video/saa7134/saa7134-input.c b/drivers/media/video/saa7134/saa7134-input.c
index 83887d1..5d2bf15 100644
--- a/drivers/media/video/saa7134/saa7134-input.c
+++ b/drivers/media/video/saa7134/saa7134-input.c
@@ -131,6 +131,23 @@ static void saa7134_input_timer(unsigned long data)
 	mod_timer(&ir->timer, timeout);
 }
 
+static void saa7134_ir_start(struct saa7134_dev *dev, struct saa7134_ir *ir)
+{
+	if (ir->polling) {
+		init_timer(&ir->timer);
+		ir->timer.function = saa7134_input_timer;
+		ir->timer.data     = (unsigned long)dev;
+		ir->timer.expires  = jiffies + HZ;
+		add_timer(&ir->timer);
+	}
+}
+
+static void saa7134_ir_stop(struct saa7134_dev *dev)
+{
+	if (dev->remote->polling)
+		del_timer_sync(&dev->remote->timer);
+}
+
 int saa7134_input_init1(struct saa7134_dev *dev)
 {
 	struct saa7134_ir *ir;
@@ -141,6 +158,7 @@ int saa7134_input_init1(struct saa7134_dev *dev)
 	u32 mask_keyup   = 0;
 	int polling      = 0;
 	int ir_type      = IR_TYPE_OTHER;
+	int err;
 
 	if (dev->has_remote != SAA7134_REMOTE_GPIO)
 		return -ENODEV;
@@ -267,9 +285,8 @@ int saa7134_input_init1(struct saa7134_dev *dev)
 	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!ir || !input_dev) {
-		kfree(ir);
-		input_free_device(input_dev);
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto err_out_free;
 	}
 
 	ir->dev = input_dev;
@@ -300,18 +317,22 @@ int saa7134_input_init1(struct saa7134_dev *dev)
 	}
 	input_dev->cdev.dev = &dev->pci->dev;
 
-	/* all done */
 	dev->remote = ir;
-	if (ir->polling) {
-		init_timer(&ir->timer);
-		ir->timer.function = saa7134_input_timer;
-		ir->timer.data     = (unsigned long)dev;
-		ir->timer.expires  = jiffies + HZ;
-		add_timer(&ir->timer);
-	}
+	saa7134_ir_start(dev, ir);
+
+	err = input_register_device(ir->dev);
+	if (err)
+		goto err_out_stop;
 
-	input_register_device(ir->dev);
 	return 0;
+
+ err_out_stop:
+	saa7134_ir_stop(dev);
+	dev->remote = NULL;
+ err_out_free:
+	input_free_device(input_dev);
+	kfree(ir);
+	return err;
 }
 
 void saa7134_input_fini(struct saa7134_dev *dev)
@@ -319,8 +340,7 @@ void saa7134_input_fini(struct saa7134_dev *dev)
 	if (NULL == dev->remote)
 		return;
 
-	if (dev->remote->polling)
-		del_timer_sync(&dev->remote->timer);
+	saa7134_ir_stop(dev);
 	input_unregister_device(dev->remote->dev);
 	kfree(dev->remote);
 	dev->remote = NULL;
diff --git a/drivers/media/video/usbvideo/quickcam_messenger.c b/drivers/media/video/usbvideo/quickcam_messenger.c
index bbf2bee..ec0ff22 100644
--- a/drivers/media/video/usbvideo/quickcam_messenger.c
+++ b/drivers/media/video/usbvideo/quickcam_messenger.c
@@ -86,6 +86,7 @@ MODULE_DEVICE_TABLE(usb, qcm_table);
 static void qcm_register_input(struct qcm *cam, struct usb_device *dev)
 {
 	struct input_dev *input_dev;
+	int error;
 
 	usb_make_path(dev, cam->input_physname, sizeof(cam->input_physname));
 	strncat(cam->input_physname, "/input0", sizeof(cam->input_physname));
@@ -106,7 +107,13 @@ static void qcm_register_input(struct qcm *cam, struct usb_device *dev)
 
 	input_dev->private = cam;
 
-	input_register_device(cam->input);
+	error = input_register_device(cam->input);
+	if (error) {
+		warn("Failed to register camera's input device, err: %d\n",
+		     error);
+		input_free_device(cam->input);
+		cam->input = NULL;
+	}
 }
 
 static void qcm_unregister_input(struct qcm *cam)