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uml: handle errors on opening host side of consoles

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If the host side of a console can't be opened, this will now produce visible
error messages.

enable_chan now returns a status and this is passed up to con_open and
ssl_open, which will complain if anything went wrong.

The default host device for the serial line driver is now a pts device rather
than a pty device since lots of hosts have LEGACY_PTYS disabled.  This had
always been failing on such hosts, but silently.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-07-15 23:38:54 -07:00 committed by Linus Torvalds
parent 75886f21e3
commit d14ad81f80
6 changed files with 38 additions and 9 deletions
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2
arch/um/defconfig
View File

@ -189,7 +189,7 @@ CONFIG_XTERM_CHAN=y
# CONFIG_NOCONFIG_CHAN is not set
CONFIG_CON_ZERO_CHAN="fd:0,fd:1"
CONFIG_CON_CHAN="xterm"
CONFIG_SSL_CHAN="pty"
CONFIG_SSL_CHAN="pts"
CONFIG_UNIX98_PTYS=y
CONFIG_LEGACY_PTYS=y
CONFIG_LEGACY_PTY_COUNT=256

21
arch/um/drivers/chan_kern.c
View File

@ -203,22 +203,37 @@ void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
}
}
void enable_chan(struct line *line)
int enable_chan(struct line *line)
{
struct list_head *ele;
struct chan *chan;
int err;
list_for_each(ele, &line->chan_list){
chan = list_entry(ele, struct chan, list);
if(open_one_chan(chan))
err = open_one_chan(chan);
if (err) {
if (chan->primary)
goto out_close;
continue;
}
if(chan->enabled)
continue;
line_setup_irq(chan->fd, chan->input, chan->output, line,
err = line_setup_irq(chan->fd, chan->input, chan->output, line,
chan);
if (err)
goto out_close;
chan->enabled = 1;
}
return 0;
out_close:
close_chan(&line->chan_list, 0);
return err;
}
/* Items are added in IRQ context, when free_irq can't be called, and

5
arch/um/drivers/line.c
View File

@ -454,7 +454,10 @@ int line_open(struct line *lines, struct tty_struct *tty)
tty->driver_data = line;
line->tty = tty;
enable_chan(line);
err = enable_chan(line);
if (err)
return err;
INIT_DELAYED_WORK(&line->task, line_timer_cb);
if(!line->sigio){

8
arch/um/drivers/ssl.c
View File

@ -97,7 +97,13 @@ static int ssl_remove(int n, char **error_out)
static int ssl_open(struct tty_struct *tty, struct file *filp)
{
return line_open(serial_lines, tty);
int err = line_open(serial_lines, tty);
if (err)
printk(KERN_ERR "Failed to open serial line %d, err = %d\n",
tty->index, err);
return err;
}
#if 0

7
arch/um/drivers/stdio_console.c
View File

@ -99,7 +99,12 @@ static int con_remove(int n, char **error_out)
static int con_open(struct tty_struct *tty, struct file *filp)
{
return line_open(vts, tty);
int err = line_open(vts, tty);
if (err)
printk(KERN_ERR "Failed to open console %d, err = %d\n",
tty->index, err);
return err;
}
/* Set in an initcall, checked in an exitcall */

2
arch/um/include/chan_kern.h
View File

@ -40,7 +40,7 @@ extern int console_open_chan(struct line *line, struct console *co);
extern void deactivate_chan(struct list_head *chans, int irq);
extern void reactivate_chan(struct list_head *chans, int irq);
extern void chan_enable_winch(struct list_head *chans, struct tty_struct *tty);
extern void enable_chan(struct line *line);
extern int enable_chan(struct line *line);
extern void close_chan(struct list_head *chans, int delay_free_irq);
extern int chan_window_size(struct list_head *chans,
unsigned short *rows_out,