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tty: cdev lock_kernel() pushdown

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Parts of the serial code actually BUG() if we don't do this.
This commit is contained in:
Jonathan Corbet 2008-05-16 09:10:50 -06:00
parent c43ef17450
commit 39d95b9d85
1 changed files with 25 additions and 2 deletions
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27
drivers/char/tty_io.c
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@ -2665,7 +2665,7 @@ static void release_dev(struct file *filp)
* ->siglock protects ->signal/->sighand
*/
static int tty_open(struct inode *inode, struct file *filp)
static int __tty_open(struct inode *inode, struct file *filp)
{
struct tty_struct *tty;
int noctty, retval;
@ -2779,6 +2779,19 @@ got_driver:
return 0;
}
/* BKL pushdown: scary code avoidance wrapper */
static int tty_open(struct inode *inode, struct file *filp)
{
int ret;
lock_kernel();
ret = __tty_open(inode, filp);
unlock_kernel();
return ret;
}
#ifdef CONFIG_UNIX98_PTYS
/**
* ptmx_open - open a unix 98 pty master
@ -2792,7 +2805,7 @@ got_driver:
* allocated_ptys_lock handles the list of free pty numbers
*/
static int ptmx_open(struct inode *inode, struct file *filp)
static int __ptmx_open(struct inode *inode, struct file *filp)
{
struct tty_struct *tty;
int retval;
@ -2831,6 +2844,16 @@ out:
devpts_kill_index(index);
return retval;
}
static int ptmx_open(struct inode *inode, struct file *filp)
{
int ret;
lock_kernel();
ret = __ptmx_open(inode, filp);
unlock_kernel();
return ret;
}
#endif
/**