[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>

1 files changed, 73 insertions, 38 deletions

diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 31b69c4ea800..1bb920c0d77a 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -240,20 +240,65 @@ void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
         }
 }
 
-void enable_chan(struct list_head *chans, struct tty_struct *tty)
+void enable_chan(struct line *line)
 {
         struct list_head *ele;
         struct chan *chan;
 
-        list_for_each(ele, chans){
+        list_for_each(ele, &line->chan_list){
                 chan = list_entry(ele, struct chan, list);
-                if(!chan->opened) continue;
+                if(open_one_chan(chan))
+                        continue;
+
+                if(chan->enabled)
+                        continue;
+                line_setup_irq(chan->fd, chan->input, chan->output, line,
+                               chan);
+                chan->enabled = 1;
+        }
+}
+
+static LIST_HEAD(irqs_to_free);
+
+void free_irqs(void)
+{
+        struct chan *chan;
+
+        while(!list_empty(&irqs_to_free)){
+                chan = list_entry(irqs_to_free.next, struct chan, free_list);
+                list_del(&chan->free_list);
+
+                if(chan->input)
+                        free_irq(chan->line->driver->read_irq, chan);
+                if(chan->output)
+                        free_irq(chan->line->driver->write_irq, chan);
+                chan->enabled = 0;
+        }
+}
+
+static void close_one_chan(struct chan *chan, int delay_free_irq)
+{
+        if(!chan->opened)
+                return;
 
-                line_setup_irq(chan->fd, chan->input, chan->output, tty);
+        if(delay_free_irq){
+                list_add(&chan->free_list, &irqs_to_free);
+        }
+        else {
+                if(chan->input)
+                        free_irq(chan->line->driver->read_irq, chan);
+                if(chan->output)
+                        free_irq(chan->line->driver->write_irq, chan);
+                chan->enabled = 0;
         }
+        if(chan->ops->close != NULL)
+                (*chan->ops->close)(chan->fd, chan->data);
+
+        chan->opened = 0;
+        chan->fd = -1;
 }
 
-void close_chan(struct list_head *chans)
+void close_chan(struct list_head *chans, int delay_free_irq)
 {
         struct chan *chan;
 
@@ -263,11 +308,7 @@ void close_chan(struct list_head *chans)
          * so it must be the last closed.
          */
         list_for_each_entry_reverse(chan, chans, list) {
-                if(!chan->opened) continue;
-                if(chan->ops->close != NULL)
-                        (*chan->ops->close)(chan->fd, chan->data);
-                chan->opened = 0;
-                chan->fd = -1;
+                close_one_chan(chan, delay_free_irq);
         }
 }
 
@@ -339,24 +380,27 @@ int chan_window_size(struct list_head *chans, unsigned short *rows_out,
         return 0;
 }
 
-void free_one_chan(struct chan *chan)
+void free_one_chan(struct chan *chan, int delay_free_irq)
 {
         list_del(&chan->list);
+
+        close_one_chan(chan, delay_free_irq);
+
         if(chan->ops->free != NULL)
                 (*chan->ops->free)(chan->data);
-        free_irq_by_fd(chan->fd);
+
         if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
         kfree(chan);
 }
 
-void free_chan(struct list_head *chans)
+void free_chan(struct list_head *chans, int delay_free_irq)
 {
         struct list_head *ele, *next;
         struct chan *chan;
 
         list_for_each_safe(ele, next, chans){
                 chan = list_entry(ele, struct chan, list);
-                free_one_chan(chan);
+                free_one_chan(chan, delay_free_irq);
         }
 }
 
@@ -466,7 +510,8 @@ struct chan_type chan_table[] = {
 #endif
 };
 
-static struct chan *parse_chan(char *str, int device, struct chan_opts *opts)
+static struct chan *parse_chan(struct line *line, char *str, int device,
+                               struct chan_opts *opts)
 {
         struct chan_type *entry;
         struct chan_ops *ops;
@@ -499,25 +544,30 @@ static struct chan *parse_chan(char *str, int device, struct chan_opts *opts)
         if(chan == NULL)
                 return NULL;
         *chan = ((struct chan) { .list          = LIST_HEAD_INIT(chan->list),
+                                 .free_list     =
+                                        LIST_HEAD_INIT(chan->free_list),
+                                 .line          = line,
                                  .primary       = 1,
                                  .input         = 0,
                                  .output        = 0,
                                  .opened        = 0,
+                                 .enabled       = 0,
                                  .fd            = -1,
                                  .ops           = ops,
                                  .data          = data });
         return chan;
 }
 
-int parse_chan_pair(char *str, struct list_head *chans, int device,
+int parse_chan_pair(char *str, struct line *line, int device,
                     struct chan_opts *opts)
 {
+        struct list_head *chans = &line->chan_list;
         struct chan *new, *chan;
         char *in, *out;
 
         if(!list_empty(chans)){
                 chan = list_entry(chans->next, struct chan, list);
-                free_chan(chans);
+                free_chan(chans, 0);
                 INIT_LIST_HEAD(chans);
         }
 
@@ -526,14 +576,14 @@ int parse_chan_pair(char *str, struct list_head *chans, int device,
                 in = str;
                 *out = '\0';
                 out++;
-                new = parse_chan(in, device, opts);
+                new = parse_chan(line, in, device, opts);
                 if(new == NULL)
                         return -1;
 
                 new->input = 1;
                 list_add(&new->list, chans);
 
-                new = parse_chan(out, device, opts);
+                new = parse_chan(line, out, device, opts);
                 if(new == NULL)
                         return -1;
 
@@ -541,7 +591,7 @@ int parse_chan_pair(char *str, struct list_head *chans, int device,
                 new->output = 1;
         }
         else {
-                new = parse_chan(str, device, opts);
+                new = parse_chan(line, str, device, opts);
                 if(new == NULL)
                         return -1;
 
@@ -592,27 +642,12 @@ void chan_interrupt(struct list_head *chans, struct work_struct *task,
                         if(chan->primary){
                                 if(tty != NULL)
                                         tty_hangup(tty);
-                                line_disable(tty, irq);
-                                close_chan(chans);
+                                close_chan(chans, 1);
                                 return;
                         }
-                        else {
-                                if(chan->ops->close != NULL)
-                                        chan->ops->close(chan->fd, chan->data);
-                        }
+                        else close_one_chan(chan, 1);
                 }
         }
  out:
         if(tty) tty_flip_buffer_push(tty);
 }
-
-/*
- * 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:
- */