X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fchar%2Ftty_io.c;h=750131010af01875d06d1c5e11818112c02ecbd2;hb=b0afffe89be619f42ae4215554ed66e67de7bb0e;hp=f69fb8d7a680223d56679e7637365c3369713b87;hpb=f34d7a5b7010b82fe97da95496b9971435530062;p=linux-2.6

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index f69fb8d7a6..750131010a 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -78,6 +78,7 @@
 #include <linux/tty_flip.h>
 #include <linux/devpts_fs.h>
 #include <linux/file.h>
+#include <linux/fdtable.h>
 #include <linux/console.h>
 #include <linux/timer.h>
 #include <linux/ctype.h>
@@ -91,7 +92,6 @@
 #include <linux/module.h>
 #include <linux/smp_lock.h>
 #include <linux/device.h>
-#include <linux/idr.h>
 #include <linux/wait.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
@@ -137,9 +137,6 @@ EXPORT_SYMBOL(tty_mutex);
 
 #ifdef CONFIG_UNIX98_PTYS
 extern struct tty_driver *ptm_driver;	/* Unix98 pty masters; for /dev/ptmx */
-extern int pty_limit;			/* Config limit on Unix98 ptys */
-static DEFINE_IDR(allocated_ptys);
-static DEFINE_MUTEX(allocated_ptys_lock);
 static int ptmx_open(struct inode *, struct file *);
 #endif
 
@@ -1218,10 +1215,11 @@ int tty_check_change(struct tty_struct *tty)
 
 	if (!tty->pgrp) {
 		printk(KERN_WARNING "tty_check_change: tty->pgrp == NULL!\n");
-		goto out;
+		goto out_unlock;
 	}
 	if (task_pgrp(current) == tty->pgrp)
-		goto out;
+		goto out_unlock;
+	spin_unlock_irqrestore(&tty->ctrl_lock, flags);
 	if (is_ignored(SIGTTOU))
 		goto out;
 	if (is_current_pgrp_orphaned()) {
@@ -1232,6 +1230,8 @@ int tty_check_change(struct tty_struct *tty)
 	set_thread_flag(TIF_SIGPENDING);
 	ret = -ERESTARTSYS;
 out:
+	return ret;
+out_unlock:
 	spin_unlock_irqrestore(&tty->ctrl_lock, flags);
 	return ret;
 }
@@ -2639,15 +2639,9 @@ static void release_dev(struct file *filp)
 	 */
 	release_tty(tty, idx);
 
-#ifdef CONFIG_UNIX98_PTYS
 	/* Make this pty number available for reallocation */
-	if (devpts) {
-		mutex_lock(&allocated_ptys_lock);
-		idr_remove(&allocated_ptys, idx);
-		mutex_unlock(&allocated_ptys_lock);
-	}
-#endif
-
+	if (devpts)
+		devpts_kill_index(idx);
 }
 
 /**
@@ -2803,29 +2797,13 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 	struct tty_struct *tty;
 	int retval;
 	int index;
-	int idr_ret;
 
 	nonseekable_open(inode, filp);
 
 	/* find a device that is not in use. */
-	mutex_lock(&allocated_ptys_lock);
-	if (!idr_pre_get(&allocated_ptys, GFP_KERNEL)) {
-		mutex_unlock(&allocated_ptys_lock);
-		return -ENOMEM;
-	}
-	idr_ret = idr_get_new(&allocated_ptys, NULL, &index);
-	if (idr_ret < 0) {
-		mutex_unlock(&allocated_ptys_lock);
-		if (idr_ret == -EAGAIN)
-			return -ENOMEM;
-		return -EIO;
-	}
-	if (index >= pty_limit) {
-		idr_remove(&allocated_ptys, index);
-		mutex_unlock(&allocated_ptys_lock);
-		return -EIO;
-	}
-	mutex_unlock(&allocated_ptys_lock);
+	index = devpts_new_index();
+	if (index < 0)
+		return index;
 
 	mutex_lock(&tty_mutex);
 	retval = init_dev(ptm_driver, index, &tty);
@@ -2838,11 +2816,11 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 	filp->private_data = tty;
 	file_move(filp, &tty->tty_files);
 
-	retval = -ENOMEM;
-	if (devpts_pty_new(tty->link))
+	retval = devpts_pty_new(tty->link);
+	if (retval)
 		goto out1;
 
-	check_tty_count(tty, "tty_open");
+	check_tty_count(tty, "ptmx_open");
 	retval = ptm_driver->ops->open(tty, filp);
 	if (!retval)
 		return 0;
@@ -2850,9 +2828,7 @@ out1:
 	release_dev(filp);
 	return retval;
 out:
-	mutex_lock(&allocated_ptys_lock);
-	idr_remove(&allocated_ptys, index);
-	mutex_unlock(&allocated_ptys_lock);
+	devpts_kill_index(index);
 	return retval;
 }
 #endif
@@ -3346,7 +3322,7 @@ static int send_break(struct tty_struct *tty, unsigned int duration)
 		msleep_interruptible(duration);
 	tty->ops->break_ctl(tty, 0);
 	tty_write_unlock(tty);
-	if (!signal_pending(current))
+	if (signal_pending(current))
 		return -EINTR;
 	return 0;
 }