diff options
Diffstat (limited to 'drivers/char/ttyprintk.c')
| -rw-r--r-- | drivers/char/ttyprintk.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/char/ttyprintk.c b/drivers/char/ttyprintk.c index 4f24e46ebe7c..56db949a7b70 100644 --- a/drivers/char/ttyprintk.c +++ b/drivers/char/ttyprintk.c @@ -15,10 +15,11 @@ #include <linux/serial.h> #include <linux/tty.h> #include <linux/module.h> +#include <linux/spinlock.h> struct ttyprintk_port { struct tty_port port; - struct mutex port_write_mutex; + spinlock_t spinlock; }; static struct ttyprintk_port tpk_port; @@ -99,11 +100,12 @@ static int tpk_open(struct tty_struct *tty, struct file *filp) static void tpk_close(struct tty_struct *tty, struct file *filp) { struct ttyprintk_port *tpkp = tty->driver_data; + unsigned long flags; - mutex_lock(&tpkp->port_write_mutex); + spin_lock_irqsave(&tpkp->spinlock, flags); /* flush tpk_printk buffer */ tpk_printk(NULL, 0); - mutex_unlock(&tpkp->port_write_mutex); + spin_unlock_irqrestore(&tpkp->spinlock, flags); tty_port_close(&tpkp->port, tty, filp); } @@ -115,13 +117,14 @@ static int tpk_write(struct tty_struct *tty, const unsigned char *buf, int count) { struct ttyprintk_port *tpkp = tty->driver_data; + unsigned long flags; int ret; /* exclusive use of tpk_printk within this tty */ - mutex_lock(&tpkp->port_write_mutex); + spin_lock_irqsave(&tpkp->spinlock, flags); ret = tpk_printk(buf, count); - mutex_unlock(&tpkp->port_write_mutex); + spin_unlock_irqrestore(&tpkp->spinlock, flags); return ret; } @@ -171,7 +174,7 @@ static int __init ttyprintk_init(void) { int ret = -ENOMEM; - mutex_init(&tpk_port.port_write_mutex); + spin_lock_init(&tpk_port.spinlock); ttyprintk_driver = tty_alloc_driver(1, TTY_DRIVER_RESET_TERMIOS | |