* (TTY driver and console driver)
*/
-#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/console.h>
#include <asm/uaccess.h>
-static spinlock_t srmcons_callback_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(srmcons_callback_lock);
static int srm_is_registered_console = 0;
/*
}
static int
-srmcons_write(struct tty_struct *tty, int from_user,
+srmcons_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
unsigned long flags;
- if (from_user) {
- char tmp[512];
- int ret = 0;
- size_t c;
-
- while ((c = count) > 0) {
- if (c > sizeof(tmp))
- c = sizeof(tmp);
-
- c -= copy_from_user(tmp, (const char __user *) buf, c);
-
- if (!c) {
- printk("%s: EFAULT (count %d)\n",
- __FUNCTION__, count);
- return -EFAULT;
- }
-
- spin_lock_irqsave(&srmcons_callback_lock, flags);
- srmcons_do_write(tty, tmp, c);
- spin_unlock_irqrestore(&srmcons_callback_lock, flags);
-
- buf += c;
- count -= c;
- ret += c;
- }
-
- return ret;
- }
-
spin_lock_irqsave(&srmcons_callback_lock, flags);
srmcons_do_write(tty, (const char *) buf, count);
spin_unlock_irqrestore(&srmcons_callback_lock, flags);
srmcons_get_private_struct(struct srmcons_private **ps)
{
static struct srmcons_private *srmconsp = NULL;
- static spinlock_t srmconsp_lock = SPIN_LOCK_UNLOCKED;
+ static DEFINE_SPINLOCK(srmconsp_lock);
unsigned long flags;
int retval = 0;
- spin_lock_irqsave(&srmconsp_lock, flags);
-
- do {
- if (srmconsp != NULL) {
- *ps = srmconsp;
- break;
- }
+ if (srmconsp == NULL) {
+ spin_lock_irqsave(&srmconsp_lock, flags);
srmconsp = kmalloc(sizeof(*srmconsp), GFP_KERNEL);
- if (srmconsp == NULL) {
+ if (srmconsp == NULL)
retval = -ENOMEM;
- break;
+ else {
+ srmconsp->tty = NULL;
+ spin_lock_init(&srmconsp->lock);
+ init_timer(&srmconsp->timer);
}
- srmconsp->tty = NULL;
- srmconsp->lock = SPIN_LOCK_UNLOCKED;
- init_timer(&srmconsp->timer);
-
- *ps = srmconsp;
- } while(0);
-
- spin_unlock_irqrestore(&srmconsp_lock, flags);
+ spin_unlock_irqrestore(&srmconsp_lock, flags);
+ }
+ *ps = srmconsp;
return retval;
}
static struct tty_driver *srmcons_driver;
-static struct tty_operations srmcons_ops = {
+static const struct tty_operations srmcons_ops = {
.open = srmcons_open,
.close = srmcons_close,
.write = srmcons_write,