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Input: mousedev - fix race when creating mixed device

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We should not be using static variable mousedev_mix in methods that can be
called before that singleton gets assigned. While at it let's add open and
close methods to mousedev structure so that we do not need to test if we
are dealing with multiplexor or normal device and simply call appropriate
method directly.

This fixes: https://bugzilla.kernel.org/show_bug.cgi?id=71551

Reported-by: GiulioDP <depasquale.giulio@gmail.com>
Tested-by: GiulioDP <depasquale.giulio@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2014-03-06 12:57:24 -08:00
parent fc7392aa1b
commit e4dbedc7ea
1 changed files with 42 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
drivers/input/mousedev.c
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@ -67,7 +67,6 @@ struct mousedev {
struct device dev;
struct cdev cdev;
bool exist;
bool is_mixdev;
struct list_head mixdev_node;
bool opened_by_mixdev;
@ -77,6 +76,9 @@ struct mousedev {
int old_x[4], old_y[4];
int frac_dx, frac_dy;
unsigned long touch;
int (*open_device)(struct mousedev *mousedev);
void (*close_device)(struct mousedev *mousedev);
};
enum mousedev_emul {
@ -116,9 +118,6 @@ static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
static struct mousedev *mousedev_mix;
static LIST_HEAD(mousedev_mix_list);
static void mixdev_open_devices(void);
static void mixdev_close_devices(void);
#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])
@ -428,9 +427,7 @@ static int mousedev_open_device(struct mousedev *mousedev)
if (retval)
return retval;
if (mousedev->is_mixdev)
mixdev_open_devices();
else if (!mousedev->exist)
if (!mousedev->exist)
retval = -ENODEV;
else if (!mousedev->open++) {
retval = input_open_device(&mousedev->handle);
@ -446,9 +443,7 @@ static void mousedev_close_device(struct mousedev *mousedev)
{
mutex_lock(&mousedev->mutex);
if (mousedev->is_mixdev)
mixdev_close_devices();
else if (mousedev->exist && !--mousedev->open)
if (mousedev->exist && !--mousedev->open)
input_close_device(&mousedev->handle);
mutex_unlock(&mousedev->mutex);
@ -459,21 +454,29 @@ static void mousedev_close_device(struct mousedev *mousedev)
* stream. Note that this function is called with mousedev_mix->mutex
* held.
*/
static void mixdev_open_devices(void)
static int mixdev_open_devices(struct mousedev *mixdev)
{
struct mousedev *mousedev;
int error;
if (mousedev_mix->open++)
return;
error = mutex_lock_interruptible(&mixdev->mutex);
if (error)
return error;
list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
if (!mousedev->opened_by_mixdev) {
if (mousedev_open_device(mousedev))
continue;
if (!mixdev->open++) {
struct mousedev *mousedev;
mousedev->opened_by_mixdev = true;
list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
if (!mousedev->opened_by_mixdev) {
if (mousedev_open_device(mousedev))
continue;
mousedev->opened_by_mixdev = true;
}
}
}
mutex_unlock(&mixdev->mutex);
return 0;
}
/*
@ -481,19 +484,22 @@ static void mixdev_open_devices(void)
* device. Note that this function is called with mousedev_mix->mutex
* held.
*/
static void mixdev_close_devices(void)
static void mixdev_close_devices(struct mousedev *mixdev)
{
struct mousedev *mousedev;
mutex_lock(&mixdev->mutex);
if (--mousedev_mix->open)
return;
if (!--mixdev->open) {
struct mousedev *mousedev;
list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
if (mousedev->opened_by_mixdev) {
mousedev->opened_by_mixdev = false;
mousedev_close_device(mousedev);
list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
if (mousedev->opened_by_mixdev) {
mousedev->opened_by_mixdev = false;
mousedev_close_device(mousedev);
}
}
}
mutex_unlock(&mixdev->mutex);
}
@ -522,7 +528,7 @@ static int mousedev_release(struct inode *inode, struct file *file)
mousedev_detach_client(mousedev, client);
kfree(client);
mousedev_close_device(mousedev);
mousedev->close_device(mousedev);
return 0;
}
@ -550,7 +556,7 @@ static int mousedev_open(struct inode *inode, struct file *file)
client->mousedev = mousedev;
mousedev_attach_client(mousedev, client);
error = mousedev_open_device(mousedev);
error = mousedev->open_device(mousedev);
if (error)
goto err_free_client;
@ -861,16 +867,21 @@ static struct mousedev *mousedev_create(struct input_dev *dev,
if (mixdev) {
dev_set_name(&mousedev->dev, "mice");
mousedev->open_device = mixdev_open_devices;
mousedev->close_device = mixdev_close_devices;
} else {
int dev_no = minor;
/* Normalize device number if it falls into legacy range */
if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS)
dev_no -= MOUSEDEV_MINOR_BASE;
dev_set_name(&mousedev->dev, "mouse%d", dev_no);
mousedev->open_device = mousedev_open_device;
mousedev->close_device = mousedev_close_device;
}
mousedev->exist = true;
mousedev->is_mixdev = mixdev;
mousedev->handle.dev = input_get_device(dev);
mousedev->handle.name = dev_name(&mousedev->dev);
mousedev->handle.handler = handler;
@ -919,7 +930,7 @@ static void mousedev_destroy(struct mousedev *mousedev)
device_del(&mousedev->dev);
mousedev_cleanup(mousedev);
input_free_minor(MINOR(mousedev->dev.devt));
if (!mousedev->is_mixdev)
if (mousedev != mousedev_mix)
input_unregister_handle(&mousedev->handle);
put_device(&mousedev->dev);
}