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Input: cdev lock_kernel() pushdown

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Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jonathan Corbet 2008-05-15 10:37:16 -06:00
parent 702e57d9ef
commit 2edbf8537e
1 changed files with 12 additions and 4 deletions
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16
drivers/input/input.c
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@ -21,6 +21,7 @@
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/smp_lock.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("Input core");
@ -1588,13 +1589,17 @@ EXPORT_SYMBOL(input_unregister_handle);
static int input_open_file(struct inode *inode, struct file *file)
{
struct input_handler *handler = input_table[iminor(inode) >> 5];
struct input_handler *handler;
const struct file_operations *old_fops, *new_fops = NULL;
int err;
lock_kernel();
/* No load-on-demand here? */
if (!handler || !(new_fops = fops_get(handler->fops)))
return -ENODEV;
handler = input_table[iminor(inode) >> 5];
if (!handler || !(new_fops = fops_get(handler->fops))) {
err = -ENODEV;
goto out;
}
/*
* That's _really_ odd. Usually NULL ->open means "nothing special",
@ -1602,7 +1607,8 @@ static int input_open_file(struct inode *inode, struct file *file)
*/
if (!new_fops->open) {
fops_put(new_fops);
return -ENODEV;
err = -ENODEV;
goto out;
}
old_fops = file->f_op;
file->f_op = new_fops;
@ -1614,6 +1620,8 @@ static int input_open_file(struct inode *inode, struct file *file)
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
out:
unlock_kernel();
return err;
}