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Commit 1871e845 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 

Pull UML fixes from Richard Weinberger:
 "This patch set contains mostly fixes and cleanups.  The UML tty driver
  uses now tty_port and is no longer broken like hell  :-)"

* 'for-linus-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  um: Add arch/x86/um to MAINTAINERS
  um: pass siginfo to guest process
  um: fix ubd_file_size for read-only files
  um: pull interrupt_end() into userspace()
  um: split syscall_trace(), pass pt_regs to it
  um: switch UPT_SET_RETURN_VALUE and regs_return_value to pt_regs
  um: set BLK_CGROUP=y in defconfig
  um: remove count_lock
  um: fully use tty_port
  um: Remove dead code
  um: remove line_ioctl()
  TTY: um/line, use tty from tty_port
  TTY: um/line, add tty_port
parents a6dc7725 b070989a

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -7382,6 +7382,7 @@ W: http://user-mode-linux.sourceforge.net 
S:	Maintained

F:	Documentation/virtual/uml/

F:	arch/um/

F:	arch/x86/um/

F:	fs/hostfs/

F:	fs/hppfs/

arch/um/defconfig

+1 −1
Original line number Diff line number Diff line
@@ -163,7 +163,7 @@ CONFIG_CGROUP_SCHED=y 
CONFIG_FAIR_GROUP_SCHED=y

# CONFIG_CFS_BANDWIDTH is not set

# CONFIG_RT_GROUP_SCHED is not set

CONFIG_BLK_CGROUP=m

CONFIG_BLK_CGROUP=y

# CONFIG_DEBUG_BLK_CGROUP is not set

# CONFIG_CHECKPOINT_RESTORE is not set

CONFIG_NAMESPACES=y

arch/um/drivers/chan_kern.c

+3 −1
Original line number Diff line number Diff line
@@ -150,9 +150,11 @@ void chan_enable_winch(struct chan *chan, struct tty_struct *tty) 
static void line_timer_cb(struct work_struct *work)

{

	struct line *line = container_of(work, struct line, task.work);

	struct tty_struct *tty = tty_port_tty_get(&line->port);



	if (!line->throttled)

		chan_interrupt(line, line->tty, line->driver->read_irq);

		chan_interrupt(line, tty, line->driver->read_irq);

	tty_kref_put(tty);

}



int enable_chan(struct line *line)

arch/um/drivers/line.c

+63 −155
Original line number Diff line number Diff line
@@ -19,9 +19,11 @@ static irqreturn_t line_interrupt(int irq, void *data) 
{

	struct chan *chan = data;

	struct line *line = chan->line;

	struct tty_struct *tty = tty_port_tty_get(&line->port);



	if (line)

		chan_interrupt(line, line->tty, irq);

		chan_interrupt(line, tty, irq);

	tty_kref_put(tty);

	return IRQ_HANDLED;

}
@@ -219,92 +221,6 @@ void line_set_termios(struct tty_struct *tty, struct ktermios * old) 
	/* nothing */

}



static const struct {

	int  cmd;

	char *level;

	char *name;

} tty_ioctls[] = {

	/* don't print these, they flood the log ... */

	{ TCGETS,      NULL,       "TCGETS"      },

	{ TCSETS,      NULL,       "TCSETS"      },

	{ TCSETSW,     NULL,       "TCSETSW"     },

	{ TCFLSH,      NULL,       "TCFLSH"      },

	{ TCSBRK,      NULL,       "TCSBRK"      },



	/* general tty stuff */

	{ TCSETSF,     KERN_DEBUG, "TCSETSF"     },

	{ TCGETA,      KERN_DEBUG, "TCGETA"      },

	{ TIOCMGET,    KERN_DEBUG, "TIOCMGET"    },

	{ TCSBRKP,     KERN_DEBUG, "TCSBRKP"     },

	{ TIOCMSET,    KERN_DEBUG, "TIOCMSET"    },



	/* linux-specific ones */

	{ TIOCLINUX,   KERN_INFO,  "TIOCLINUX"   },

	{ KDGKBMODE,   KERN_INFO,  "KDGKBMODE"   },

	{ KDGKBTYPE,   KERN_INFO,  "KDGKBTYPE"   },

	{ KDSIGACCEPT, KERN_INFO,  "KDSIGACCEPT" },

};



int line_ioctl(struct tty_struct *tty, unsigned int cmd,

				unsigned long arg)

{

	int ret;

	int i;



	ret = 0;

	switch(cmd) {

#ifdef TIOCGETP

	case TIOCGETP:

	case TIOCSETP:

	case TIOCSETN:

#endif

#ifdef TIOCGETC

	case TIOCGETC:

	case TIOCSETC:

#endif

#ifdef TIOCGLTC

	case TIOCGLTC:

	case TIOCSLTC:

#endif

	/* Note: these are out of date as we now have TCGETS2 etc but this

	   whole lot should probably go away */

	case TCGETS:

	case TCSETSF:

	case TCSETSW:

	case TCSETS:

	case TCGETA:

	case TCSETAF:

	case TCSETAW:

	case TCSETA:

	case TCXONC:

	case TCFLSH:

	case TIOCOUTQ:

	case TIOCINQ:

	case TIOCGLCKTRMIOS:

	case TIOCSLCKTRMIOS:

	case TIOCPKT:

	case TIOCGSOFTCAR:

	case TIOCSSOFTCAR:

		return -ENOIOCTLCMD;

#if 0

	case TCwhatever:

		/* do something */

		break;

#endif

	default:

		for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)

			if (cmd == tty_ioctls[i].cmd)

				break;

		if (i == ARRAY_SIZE(tty_ioctls)) {

			printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",

			       __func__, tty->name, cmd);

		}

		ret = -ENOIOCTLCMD;

		break;

	}

	return ret;

}



void line_throttle(struct tty_struct *tty)

{

	struct line *line = tty->driver_data;
@@ -333,7 +249,7 @@ static irqreturn_t line_write_interrupt(int irq, void *data) 
{

	struct chan *chan = data;

	struct line *line = chan->line;

	struct tty_struct *tty = line->tty;

	struct tty_struct *tty;

	int err;



	/*
@@ -352,10 +268,13 @@ static irqreturn_t line_write_interrupt(int irq, void *data) 
	}

	spin_unlock(&line->lock);



	tty = tty_port_tty_get(&line->port);

	if (tty == NULL)

		return IRQ_NONE;



	tty_wakeup(tty);

	tty_kref_put(tty);



	return IRQ_HANDLED;

}
@@ -377,43 +296,14 @@ int line_setup_irq(int fd, int input, int output, struct line *line, void *data) 
	return err;

}



/*

 * Normally, a driver like this can rely mostly on the tty layer

 * locking, particularly when it comes to the driver structure.

 * However, in this case, mconsole requests can come in "from the

 * side", and race with opens and closes.

 *

 * mconsole config requests will want to be sure the device isn't in

 * use, and get_config, open, and close will want a stable

 * configuration.  The checking and modification of the configuration

 * is done under a spinlock.  Checking whether the device is in use is

 * line->tty->count > 1, also under the spinlock.

 *

 * line->count serves to decide whether the device should be enabled or

 * disabled on the host.  If it's equal to 0, then we are doing the

 * first open or last close.  Otherwise, open and close just return.

 */



int line_open(struct line *lines, struct tty_struct *tty)

static int line_activate(struct tty_port *port, struct tty_struct *tty)

{

	struct line *line = &lines[tty->index];

	int err = -ENODEV;



	mutex_lock(&line->count_lock);

	if (!line->valid)

		goto out_unlock;



	err = 0;

	if (line->count++)

		goto out_unlock;



	BUG_ON(tty->driver_data);

	tty->driver_data = line;

	line->tty = tty;

	int ret;

	struct line *line = tty->driver_data;



	err = enable_chan(line);

	if (err) /* line_close() will be called by our caller */

		goto out_unlock;

	ret = enable_chan(line);

	if (ret)

		return ret;



	if (!line->sigio) {

		chan_enable_winch(line->chan_out, tty);
@@ -422,43 +312,59 @@ int line_open(struct line *lines, struct tty_struct *tty) 


	chan_window_size(line, &tty->winsize.ws_row,

		&tty->winsize.ws_col);

out_unlock:

	mutex_unlock(&line->count_lock);

	return err;



	return 0;

}



static void unregister_winch(struct tty_struct *tty);

static const struct tty_port_operations line_port_ops = {

	.activate = line_activate,

};



void line_close(struct tty_struct *tty, struct file * filp)

int line_open(struct tty_struct *tty, struct file *filp)

{

	struct line *line = tty->driver_data;



	/*

	 * If line_open fails (and tty->driver_data is never set),

	 * tty_open will call line_close.  So just return in this case.

	 */

	if (line == NULL)

		return;

	return tty_port_open(&line->port, tty, filp);

}



	/* We ignore the error anyway! */

	flush_buffer(line);

int line_install(struct tty_driver *driver, struct tty_struct *tty,

		 struct line *line)

{

	int ret;



	mutex_lock(&line->count_lock);

	BUG_ON(!line->valid);

	ret = tty_standard_install(driver, tty);

	if (ret)

		return ret;



	tty->driver_data = line;



	if (--line->count)

		goto out_unlock;

	return 0;

}



	line->tty = NULL;

	tty->driver_data = NULL;

static void unregister_winch(struct tty_struct *tty);



void line_cleanup(struct tty_struct *tty)

{

	struct line *line = tty->driver_data;



	if (line->sigio) {

		unregister_winch(tty);

		line->sigio = 0;

	}

}



void line_close(struct tty_struct *tty, struct file * filp)

{

	struct line *line = tty->driver_data;



	tty_port_close(&line->port, tty, filp);

}



out_unlock:

	mutex_unlock(&line->count_lock);

void line_hangup(struct tty_struct *tty)

{

	struct line *line = tty->driver_data;



	tty_port_hangup(&line->port);

}



void close_lines(struct line *lines, int nlines)
@@ -476,9 +382,7 @@ int setup_one_line(struct line *lines, int n, char *init, 
	struct tty_driver *driver = line->driver->driver;

	int err = -EINVAL;



	mutex_lock(&line->count_lock);



	if (line->count) {

	if (line->port.count) {

		*error_out = "Device is already open";

		goto out;

	}
@@ -519,7 +423,6 @@ int setup_one_line(struct line *lines, int n, char *init, 
		}

	}

out:

	mutex_unlock(&line->count_lock);

	return err;

}
@@ -607,13 +510,17 @@ int line_get_config(char *name, struct line *lines, unsigned int num, char *str, 


	line = &lines[dev];



	mutex_lock(&line->count_lock);

	if (!line->valid)

		CONFIG_CHUNK(str, size, n, "none", 1);

	else if (line->tty == NULL)

	else {

		struct tty_struct *tty = tty_port_tty_get(&line->port);

		if (tty == NULL) {

			CONFIG_CHUNK(str, size, n, line->init_str, 1);

	else n = chan_config_string(line, str, size, error_out);

	mutex_unlock(&line->count_lock);

		} else {

			n = chan_config_string(line, str, size, error_out);

			tty_kref_put(tty);

		}

	}



	return n;

}
@@ -663,8 +570,9 @@ int register_lines(struct line_driver *line_driver, 
	driver->init_termios = tty_std_termios;

	

	for (i = 0; i < nlines; i++) {

		tty_port_init(&lines[i].port);

		lines[i].port.ops = &line_port_ops;

		spin_lock_init(&lines[i].lock);

		mutex_init(&lines[i].count_lock);

		lines[i].driver = line_driver;

		INIT_LIST_HEAD(&lines[i].chan_list);

	}

arch/um/drivers/line.h

+6 −6
Original line number Diff line number Diff line
@@ -32,9 +32,7 @@ struct line_driver { 
};



struct line {

	struct tty_struct *tty;

	struct mutex count_lock;

	unsigned long count;

	struct tty_port port;

	int valid;



	char *init_str;
@@ -59,7 +57,11 @@ struct line { 
};



extern void line_close(struct tty_struct *tty, struct file * filp);

extern int line_open(struct line *lines, struct tty_struct *tty);

extern int line_open(struct tty_struct *tty, struct file *filp);

extern int line_install(struct tty_driver *driver, struct tty_struct *tty,

	struct line *line);

extern void line_cleanup(struct tty_struct *tty);

extern void line_hangup(struct tty_struct *tty);

extern int line_setup(char **conf, unsigned nlines, char **def,

		      char *init, char *name);

extern int line_write(struct tty_struct *tty, const unsigned char *buf,
@@ -70,8 +72,6 @@ extern int line_chars_in_buffer(struct tty_struct *tty); 
extern void line_flush_buffer(struct tty_struct *tty);

extern void line_flush_chars(struct tty_struct *tty);

extern int line_write_room(struct tty_struct *tty);

extern int line_ioctl(struct tty_struct *tty, unsigned int cmd,

				unsigned long arg);

extern void line_throttle(struct tty_struct *tty);

extern void line_unthrottle(struct tty_struct *tty);