From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxim Levitsky Subject: [PATCH 2/7] IR: make sure we register the input device when it is safe to do so. Date: Fri, 15 Oct 2010 17:07:48 +0200 Message-ID: <1287155273-16171-3-git-send-email-maximlevitsky@gmail.com> References: <1287155273-16171-1-git-send-email-maximlevitsky@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1287155273-16171-1-git-send-email-maximlevitsky-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: lirc-list-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: lirc-list-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Cc: mchehab-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-input@vger.kernel.org As soon as input device is registered, it might be accessed (and it is) This can trigger a hardware interrupt that can access not yet initialized ir->raw, (by sending a sample) This can be reproduced by holding down a remote button and reloading the module. And this always crashes the systems where hardware decides to send an interrupt right at the moment it is enabled. Signed-off-by: Maxim Levitsky Acked-by: Jarod Wilson --- 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 --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 a3f0af3..1997812 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 46d4246..ada2ec6 100644 --- a/drivers/media/IR/ir-sysfs.c +++ b/drivers/media/IR/ir-sysfs.c @@ -256,8 +256,6 @@ 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); @@ -266,17 +264,28 @@ 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); @@ -292,11 +301,9 @@ 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 -- 1.7.1 ------------------------------------------------------------------------------ Download new Adobe(R) Flash(R) Builder(TM) 4 The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly Flex(R) Builder(TM)) enable the development of rich applications that run across multiple browsers and platforms. Download your free trials today! http://p.sf.net/sfu/adobe-dev2dev