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[2/7] IR: make sure we register input device when it safe to do so.

Message ID 1283158348-7429-3-git-send-email-maximlevitsky@gmail.com (mailing list archive)
State Superseded, archived
Headers

Commit Message

Maxim Levitsky Aug. 30, 2010, 8:52 a.m. UTC 
  As soon as input device is registered, it might be accessed (and it is)
This can trigger hardware interrupts for example that in turn
can access not yet initialized ir->raw.
Can be reproduced by holding down a remote button and reloading the module.
And always crashes the systems where hardware decides to send and interrupt
right at the moment it is enabled.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
---
 drivers/media/IR/ir-core-priv.h |    1 +
 drivers/media/IR/ir-keytable.c  |    2 ++
 drivers/media/IR/ir-sysfs.c     |   27 +++++++++++++++++----------
 3 files changed, 20 insertions(+), 10 deletions(-)
diff mbox

Patch

diff --git a/drivers/media/IR/ir-core-priv.h b/drivers/media/IR/ir-core-priv.h
index 761e7f4..5d7e08f 100644
--- a/drivers/media/IR/ir-core-priv.h
+++ b/drivers/media/IR/ir-core-priv.h
@@ -116,6 +116,7 @@  static inline void decrease_duration(struct ir_raw_event *ev, unsigned duration)
  * Routines from ir-sysfs.c - Meant to be called only internally inside
  * ir-core
  */
+int ir_register_input(struct input_dev *input_dev);
 
 int ir_register_class(struct input_dev *input_dev);
 void ir_unregister_class(struct input_dev *input_dev);
diff --git a/drivers/media/IR/ir-keytable.c b/drivers/media/IR/ir-keytable.c
index 7e82a9d..3f0dd80 100644
--- a/drivers/media/IR/ir-keytable.c
+++ b/drivers/media/IR/ir-keytable.c
@@ -505,6 +505,8 @@  int __ir_input_register(struct input_dev *input_dev,
 				goto out_event;
 		}
 
+	rc = ir_register_input(input_dev);
+
 	IR_dprintk(1, "Registered input device on %s for %s remote%s.\n",
 		   driver_name, rc_tab->name,
 		   (ir_dev->props && ir_dev->props->driver_type == RC_DRIVER_IR_RAW) ?
diff --git a/drivers/media/IR/ir-sysfs.c b/drivers/media/IR/ir-sysfs.c
index 96dafc4..c0075f1 100644
--- a/drivers/media/IR/ir-sysfs.c
+++ b/drivers/media/IR/ir-sysfs.c
@@ -251,8 +251,6 @@  static struct device_type rc_dev_type = {
  */
 int ir_register_class(struct input_dev *input_dev)
 {
-	int rc;
-	const char *path;
 	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
 	int devno = find_first_zero_bit(&ir_core_dev_number,
 					IRRCV_NUM_DEVICES);
@@ -261,17 +259,28 @@  int ir_register_class(struct input_dev *input_dev)
 		return devno;
 
 	ir_dev->dev.type = &rc_dev_type;
+	ir_dev->devno = devno;
 
 	ir_dev->dev.class = &ir_input_class;
 	ir_dev->dev.parent = input_dev->dev.parent;
+	input_dev->dev.parent = &ir_dev->dev;
 	dev_set_name(&ir_dev->dev, "rc%d", devno);
 	dev_set_drvdata(&ir_dev->dev, ir_dev);
-	rc = device_register(&ir_dev->dev);
-	if (rc)
-		return rc;
+	return  device_register(&ir_dev->dev);
+};
+
+/**
+ * ir_register_input - registers ir input device with input subsystem
+ * @input_dev:	the struct input_dev descriptor of the device
+ */
+
+int ir_register_input(struct input_dev *input_dev)
+{
+	struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
+	int rc;
+	const char *path;
 
 
-	input_dev->dev.parent = &ir_dev->dev;
 	rc = input_register_device(input_dev);
 	if (rc < 0) {
 		device_del(&ir_dev->dev);
@@ -287,11 +296,9 @@  int ir_register_class(struct input_dev *input_dev)
 		path ? path : "N/A");
 	kfree(path);
 
-	ir_dev->devno = devno;
-	set_bit(devno, &ir_core_dev_number);
-
+	set_bit(ir_dev->devno, &ir_core_dev_number);
 	return 0;
-};
+}
 
 /**
  * ir_unregister_class() - removes the sysfs for sysfs for