[PATCH] uml: Simplify console opening/closing and irq registration

This patch simplifies the opening and closing of host console devices and the
registration and deregistration of IRQs.  The intent is to make it obvious
that an IRQ can't exist without an open file descriptor.

chan_enable will now open the channel, and when both opening and IRQ
registration are desired, this should be used.  Opening only is done for the
initial console, so that interface still needs to exist.

The free_irqs_later interface is now gone.  It was intended to avoid freeing
an IRQ while it was being processed.  It did this, but it didn't eliminate the
possiblity of free_irq being called from an interrupt, which is bad.  In its
place is a list of irqs to be freed, which is processed by the signal handler
just before exiting.  close_one_chan now disables irqs.

When a host device disappears, it is just closed, and that disables IRQs.

The device id registered with the IRQ is now the chan structure, not the tty.
This is because the interrupt arrives on a descriptor associated with the
channel.  This caused equivalent changes in the arguments to line_timer_cb.
line_disable is gone since it is not used any more.

The count field in the line structure is gone.  tty->count is used instead.

The complicated logic in sigio_handler with freeing IRQs when necessary and
making sure its idea of the next irq is correct is now much simpler.  The irq
list can't be rearranged underneath it, so it is now a simple list walk.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 10 insertions, 18 deletions

diff --git a/arch/um/include/chan_kern.h b/arch/um/include/chan_kern.h
index 22bf3a73437c..84d1f64f9795 100644
--- a/arch/um/include/chan_kern.h
+++ b/arch/um/include/chan_kern.h
@@ -14,11 +14,14 @@
 
 struct chan {
 	struct list_head list;
+	struct list_head free_list;
+	struct line *line;
 	char *dev;
 	unsigned int primary:1;
 	unsigned int input:1;
 	unsigned int output:1;
 	unsigned int opened:1;
+	unsigned int enabled:1;
 	int fd;
 	struct chan_ops *ops;
 	void *data;
@@ -26,7 +29,7 @@ struct chan {
 
 extern void chan_interrupt(struct list_head *chans, struct work_struct *task,
 			   struct tty_struct *tty, int irq);
-extern int parse_chan_pair(char *str, struct list_head *chans, int device,
+extern int parse_chan_pair(char *str, struct line *line, int device,
 			   struct chan_opts *opts);
 extern int open_chan(struct list_head *chans);
 extern int write_chan(struct list_head *chans, const char *buf, int len,
@@ -35,9 +38,9 @@ extern int console_write_chan(struct list_head *chans, const char *buf,
 			      int len);
 extern int console_open_chan(struct line *line, struct console *co,
 			     struct chan_opts *opts);
-extern void close_chan(struct list_head *chans);
 extern void chan_enable_winch(struct list_head *chans, struct tty_struct *tty);
-extern void enable_chan(struct list_head *chans, struct tty_struct *tty);
+extern void 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, 
 			     unsigned short *cols_out);
diff --git a/arch/um/include/irq_user.h b/arch/um/include/irq_user.h
index f724b717213f..b61deb8b362a 100644
--- a/arch/um/include/irq_user.h
+++ b/arch/um/include/irq_user.h
@@ -18,19 +18,8 @@ extern int deactivate_all_fds(void);
 extern void forward_interrupts(int pid);
 extern void init_irq_signals(int on_sigstack);
 extern void forward_ipi(int fd, int pid);
-extern void free_irq_later(int irq, void *dev_id);
 extern int activate_ipi(int fd, int pid);
 extern unsigned long irq_lock(void);
 extern void irq_unlock(unsigned long flags);
-#endif
 
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
+#endif
diff --git a/arch/um/include/line.h b/arch/um/include/line.h
index 474398ba1207..e6cc3abfd4db 100644
--- a/arch/um/include/line.h
+++ b/arch/um/include/line.h
@@ -32,6 +32,7 @@ struct line_driver {
 };
 
 struct line {
+	struct tty_struct *tty;
 	char *init_str;
 	int init_pri;
 	struct list_head chan_list;
@@ -89,10 +90,9 @@ extern int line_ioctl(struct tty_struct *tty, struct file * file,
 		      unsigned int cmd, unsigned long arg);
 
 extern char *add_xterm_umid(char *base);
-extern int line_setup_irq(int fd, int input, int output,
-			  struct tty_struct *tty);
+extern int line_setup_irq(int fd, int input, int output, struct line *line,
+			  void *data);
 extern void line_close_chan(struct line *line);
-extern void line_disable(struct tty_struct *tty, int current_irq);
 extern struct tty_driver * line_register_devfs(struct lines *set,
 				struct line_driver *line_driver,
 				struct tty_operations *driver,