[media] serial_ir: ensure we're ready to receive interrupts

When the interrupt requested with devm_request_irq(), serial_ir.rcdev
is still null so will cause null deference if the irq handler is called
early on.

Also ensure that timeout_timer is setup.

Link: http://lkml.kernel.org/r/CA+55aFxsh2uF8gi5sN_guY3Z+tiLv7LpJYKBw+y8vqLzp+TsnQ@mail.gmail.com
[mchehab@s-opensource.com: moved serial_ir_probe() back to its original place]

Cc: <stable@vger.kernel.org> # 4.10
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/rc/serial_ir.c b/drivers/media/rc/serial_ir.c
index 923fb22..41b54e4 100644 (file)
--- a/drivers/media/rc/serial_ir.c
+++ b/drivers/media/rc/serial_ir.c
@@ -487,10 +487,69 @@ static void serial_ir_timeout(unsigned long arg)
        ir_raw_event_handle(serial_ir.rcdev);
 }
 
+/* Needed by serial_ir_probe() */
+static int serial_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
+                       unsigned int count);
+static int serial_ir_tx_duty_cycle(struct rc_dev *dev, u32 cycle);
+static int serial_ir_tx_carrier(struct rc_dev *dev, u32 carrier);
+static int serial_ir_open(struct rc_dev *rcdev);
+static void serial_ir_close(struct rc_dev *rcdev);
+
 static int serial_ir_probe(struct platform_device *dev)
 {
+       struct rc_dev *rcdev;
        int i, nlow, nhigh, result;
 
+       rcdev = devm_rc_allocate_device(&dev->dev, RC_DRIVER_IR_RAW);
+       if (!rcdev)
+               return -ENOMEM;
+
+       if (hardware[type].send_pulse && hardware[type].send_space)
+               rcdev->tx_ir = serial_ir_tx;
+       if (hardware[type].set_send_carrier)
+               rcdev->s_tx_carrier = serial_ir_tx_carrier;
+       if (hardware[type].set_duty_cycle)
+               rcdev->s_tx_duty_cycle = serial_ir_tx_duty_cycle;
+
+       switch (type) {
+       case IR_HOMEBREW:
+               rcdev->input_name = "Serial IR type home-brew";
+               break;
+       case IR_IRDEO:
+               rcdev->input_name = "Serial IR type IRdeo";
+               break;
+       case IR_IRDEO_REMOTE:
+               rcdev->input_name = "Serial IR type IRdeo remote";
+               break;
+       case IR_ANIMAX:
+               rcdev->input_name = "Serial IR type AnimaX";
+               break;
+       case IR_IGOR:
+               rcdev->input_name = "Serial IR type IgorPlug";
+               break;
+       }
+
+       rcdev->input_phys = KBUILD_MODNAME "/input0";
+       rcdev->input_id.bustype = BUS_HOST;
+       rcdev->input_id.vendor = 0x0001;
+       rcdev->input_id.product = 0x0001;
+       rcdev->input_id.version = 0x0100;
+       rcdev->open = serial_ir_open;
+       rcdev->close = serial_ir_close;
+       rcdev->dev.parent = &serial_ir.pdev->dev;
+       rcdev->allowed_protocols = RC_BIT_ALL_IR_DECODER;
+       rcdev->driver_name = KBUILD_MODNAME;
+       rcdev->map_name = RC_MAP_RC6_MCE;
+       rcdev->min_timeout = 1;
+       rcdev->timeout = IR_DEFAULT_TIMEOUT;
+       rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
+       rcdev->rx_resolution = 250000;
+
+       serial_ir.rcdev = rcdev;
+
+       setup_timer(&serial_ir.timeout_timer, serial_ir_timeout,
+                   (unsigned long)&serial_ir);
+
        result = devm_request_irq(&dev->dev, irq, serial_ir_irq_handler,
                                  share_irq ? IRQF_SHARED : 0,
                                  KBUILD_MODNAME, &hardware);
@@ -516,9 +575,6 @@ static int serial_ir_probe(struct platform_device *dev)
                return -EBUSY;
        }
 
-       setup_timer(&serial_ir.timeout_timer, serial_ir_timeout,
-                   (unsigned long)&serial_ir);
-
        result = hardware_init_port();
        if (result < 0)
                return result;
@@ -552,7 +608,8 @@ static int serial_ir_probe(struct platform_device *dev)
                         sense ? "low" : "high");
 
        dev_dbg(&dev->dev, "Interrupt %d, port %04x obtained\n", irq, io);
-       return 0;
+
+       return devm_rc_register_device(&dev->dev, rcdev);
 }
 
 static int serial_ir_open(struct rc_dev *rcdev)
@@ -723,7 +780,6 @@ static void serial_ir_exit(void)
 
 static int __init serial_ir_init_module(void)
 {
-       struct rc_dev *rcdev;
        int result;
 
        switch (type) {
@@ -754,63 +810,9 @@ static int __init serial_ir_init_module(void)
                sense = !!sense;
 
        result = serial_ir_init();
-       if (result)
-               return result;
-
-       rcdev = devm_rc_allocate_device(&serial_ir.pdev->dev, RC_DRIVER_IR_RAW);
-       if (!rcdev) {
-               result = -ENOMEM;
-               goto serial_cleanup;
-       }
-
-       if (hardware[type].send_pulse && hardware[type].send_space)
-               rcdev->tx_ir = serial_ir_tx;
-       if (hardware[type].set_send_carrier)
-               rcdev->s_tx_carrier = serial_ir_tx_carrier;
-       if (hardware[type].set_duty_cycle)
-               rcdev->s_tx_duty_cycle = serial_ir_tx_duty_cycle;
-
-       switch (type) {
-       case IR_HOMEBREW:
-               rcdev->input_name = "Serial IR type home-brew";
-               break;
-       case IR_IRDEO:
-               rcdev->input_name = "Serial IR type IRdeo";
-               break;
-       case IR_IRDEO_REMOTE:
-               rcdev->input_name = "Serial IR type IRdeo remote";
-               break;
-       case IR_ANIMAX:
-               rcdev->input_name = "Serial IR type AnimaX";
-               break;
-       case IR_IGOR:
-               rcdev->input_name = "Serial IR type IgorPlug";
-               break;
-       }
-
-       rcdev->input_phys = KBUILD_MODNAME "/input0";
-       rcdev->input_id.bustype = BUS_HOST;
-       rcdev->input_id.vendor = 0x0001;
-       rcdev->input_id.product = 0x0001;
-       rcdev->input_id.version = 0x0100;
-       rcdev->open = serial_ir_open;
-       rcdev->close = serial_ir_close;
-       rcdev->dev.parent = &serial_ir.pdev->dev;
-       rcdev->allowed_protocols = RC_BIT_ALL_IR_DECODER;
-       rcdev->driver_name = KBUILD_MODNAME;
-       rcdev->map_name = RC_MAP_RC6_MCE;
-       rcdev->min_timeout = 1;
-       rcdev->timeout = IR_DEFAULT_TIMEOUT;
-       rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
-       rcdev->rx_resolution = 250000;
-
-       serial_ir.rcdev = rcdev;
-
-       result = rc_register_device(rcdev);
-
        if (!result)
                return 0;
-serial_cleanup:
+
        serial_ir_exit();
        return result;
 }
@@ -818,7 +820,6 @@ serial_cleanup:
 static void __exit serial_ir_exit_module(void)
 {
        del_timer_sync(&serial_ir.timeout_timer);
-       rc_unregister_device(serial_ir.rcdev);
        serial_ir_exit();
 }