[PATCH v3 resend] [media] serial_ir: ensure we're ready to receive interrupts
Mauro Carvalho Chehab
mchehab at s-opensource.com
Sat Feb 25 06:47:54 PST 2017
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Hash: SHA256
From: Sean Young <sean at mess.org>
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 at s-opensource.com: moved serial_ir_probe() back to its original place]
Cc: <stable at vger.kernel.org> # 4.10
Signed-off-by: Sean Young <sean at mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab at s-opensource.com>
- ---
Something got wrong when trying to sign the patch on claws-mail.
Resending it.
drivers/media/rc/serial_ir.c | 123 ++++++++++++++++++++++---------------------
1 file changed, 62 insertions(+), 61 deletions(-)
diff --git a/drivers/media/rc/serial_ir.c b/drivers/media/rc/serial_ir.c
index 923fb2299553..41b54e40176c 100644
- --- 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 @@ static int __init serial_ir_init_module(void)
static void __exit serial_ir_exit_module(void)
{
del_timer_sync(&serial_ir.timeout_timer);
- - rc_unregister_device(serial_ir.rcdev);
serial_ir_exit();
}
- --
2.9.3
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