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authorPaul Fulghum <paulkf@microgate.com>2006-02-03 03:04:41 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-03 08:32:09 -0800
commit808249ceba49cdb3054c0aa5b75a61862d6cab94 (patch)
tree246d11a687db3e8a775e746ed8f0da1aeedae70c /include
parent546cfdf47f2ea2438b01f8626a60b87f9d8d1e53 (diff)
[PATCH] new tty buffering locking fix
Change locking in the new tty buffering facility from using tty->read_lock, which is currently ignored by drivers and thus ineffective. New locking uses a new tty buffering specific lock enforced centrally in the tty buffering code. Two drivers (esp and cyclades) are updated to use the tty buffering functions instead of accessing tty buffering internals directly. This is required for the new locking to work. Minor checks for NULL buffers added to tty_prepare_flip_string/tty_prepare_flip_string_flags Signed-off-by: Paul Fulghum <paulkf@microgate.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kbd_kern.h5
-rw-r--r--include/linux/tty.h2
-rw-r--r--include/linux/tty_flip.h7
3 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h
index 45f625d7d0b..3aed37314ab 100644
--- a/include/linux/kbd_kern.h
+++ b/include/linux/kbd_kern.h
@@ -151,6 +151,11 @@ extern unsigned int keymap_count;
static inline void con_schedule_flip(struct tty_struct *t)
{
+ unsigned long flags;
+ spin_lock_irqsave(&t->buf.lock, flags);
+ if (t->buf.tail != NULL)
+ t->buf.tail->active = 0;
+ spin_unlock_irqrestore(&t->buf.lock, flags);
schedule_work(&t->buf.work);
}
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 3787102e4b1..a7bd3b4558d 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -57,6 +57,7 @@ struct tty_buffer {
unsigned char *flag_buf_ptr;
int used;
int size;
+ int active;
/* Data points here */
unsigned long data[0];
};
@@ -64,6 +65,7 @@ struct tty_buffer {
struct tty_bufhead {
struct work_struct work;
struct semaphore pty_sem;
+ spinlock_t lock;
struct tty_buffer *head; /* Queue head */
struct tty_buffer *tail; /* Active buffer */
struct tty_buffer *free; /* Free queue head */
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
index be1400e8248..82961eb1988 100644
--- a/include/linux/tty_flip.h
+++ b/include/linux/tty_flip.h
@@ -17,7 +17,7 @@ _INLINE_ int tty_insert_flip_char(struct tty_struct *tty,
unsigned char ch, char flag)
{
struct tty_buffer *tb = tty->buf.tail;
- if (tb && tb->used < tb->size) {
+ if (tb && tb->active && tb->used < tb->size) {
tb->flag_buf_ptr[tb->used] = flag;
tb->char_buf_ptr[tb->used++] = ch;
return 1;
@@ -27,6 +27,11 @@ _INLINE_ int tty_insert_flip_char(struct tty_struct *tty,
_INLINE_ void tty_schedule_flip(struct tty_struct *tty)
{
+ unsigned long flags;
+ spin_lock_irqsave(&tty->buf.lock, flags);
+ if (tty->buf.tail != NULL)
+ tty->buf.tail->active = 0;
+ spin_unlock_irqrestore(&tty->buf.lock, flags);
schedule_delayed_work(&tty->buf.work, 1);
}