From b97b77cca627b2e3e6d0015e2e14b1d1c12de0c8 Mon Sep 17 00:00:00 2001
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Date: Sun, 1 May 2005 08:58:56 -0700
Subject: [PATCH] uml: redo console locking

Fix some console locking problems (including scheduling in atomic) and various
reorderings and cleanup in that code.  Not yet ready for 2.6.12 probably.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 arch/um/include/line.h | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

(limited to 'arch/um/include')

diff --git a/arch/um/include/line.h b/arch/um/include/line.h
index 6d81ecc17be..4c5e92c04cc 100644
--- a/arch/um/include/line.h
+++ b/arch/um/include/line.h
@@ -10,7 +10,7 @@
 #include "linux/workqueue.h"
 #include "linux/tty.h"
 #include "linux/interrupt.h"
-#include "asm/semaphore.h"
+#include "linux/spinlock.h"
 #include "chan_user.h"
 #include "mconsole_kern.h"
 
@@ -37,10 +37,18 @@ struct line {
 	struct list_head chan_list;
 	int valid;
 	int count;
-	struct semaphore sem;
+	/*This lock is actually, mostly, local to*/
+	spinlock_t lock;
+
+	/* Yes, this is a real circular buffer.
+	 * XXX: And this should become a struct kfifo!
+	 *
+	 * buffer points to a buffer allocated on demand, of length
+	 * LINE_BUFSIZE, head to the start of the ring, tail to the end.*/
 	char *buffer;
 	char *head;
 	char *tail;
+
 	int sigio;
 	struct work_struct task;
 	struct line_driver *driver;
@@ -52,7 +60,6 @@ struct line {
 	  init_pri :	INIT_STATIC, \
 	  chan_list : 	{ }, \
 	  valid :	1, \
-	  sem : 	{ }, \
 	  buffer :	NULL, \
 	  head :	NULL, \
 	  tail :	NULL, \
@@ -69,15 +76,18 @@ struct lines {
 extern void line_close(struct tty_struct *tty, struct file * filp);
 extern int line_open(struct line *lines, struct tty_struct *tty, 
 		     struct chan_opts *opts);
-extern int line_setup(struct line *lines, int num, char *init, 
+extern int line_setup(struct line *lines, unsigned int sizeof_lines, char *init,
 		      int all_allowed);
 extern int line_write(struct tty_struct *tty, const unsigned char *buf, int len);
 extern void line_put_char(struct tty_struct *tty, unsigned char ch);
 extern void line_set_termios(struct tty_struct *tty, struct termios * old);
 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, 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 void line_close_chan(struct line *line);
@@ -89,20 +99,10 @@ extern struct tty_driver * line_register_devfs(struct lines *set,
 				int nlines);
 extern void lines_init(struct line *lines, int nlines);
 extern void close_lines(struct line *lines, int nlines);
-extern int line_config(struct line *lines, int num, char *str);
-extern int line_remove(struct line *lines, int num, char *str);
-extern int line_get_config(char *dev, struct line *lines, int num, char *str, 
+
+extern int line_config(struct line *lines, unsigned int sizeof_lines, char *str);
+extern int line_remove(struct line *lines, unsigned int sizeof_lines, char *str);
+extern int line_get_config(char *dev, struct line *lines, unsigned int sizeof_lines, char *str,
 			   int size, char **error_out);
 
 #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:
- */
-- 
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