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-rw-r--r--arch/um/drivers/line.c54
1 files changed, 24 insertions, 30 deletions
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index a3c3937..46ceb25 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -774,55 +774,49 @@ void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty)
printk("register_winch_irq - failed to register IRQ\n");
}
+static void free_winch(struct winch *winch)
+{
+ list_del(&winch->list);
+
+ if(winch->pid != -1)
+ os_kill_process(winch->pid, 1);
+ if(winch->fd != -1)
+ os_close_file(winch->fd);
+
+ free_irq(WINCH_IRQ, winch);
+ kfree(winch);
+}
+
static void unregister_winch(struct tty_struct *tty)
{
struct list_head *ele;
- struct winch *winch, *found = NULL;
+ struct winch *winch;
spin_lock(&winch_handler_lock);
+
list_for_each(ele, &winch_handlers){
winch = list_entry(ele, struct winch, list);
if(winch->tty == tty){
- found = winch;
- break;
+ free_winch(winch);
+ break;
}
}
- if(found == NULL)
- goto err;
-
- list_del(&winch->list);
- spin_unlock(&winch_handler_lock);
-
- if(winch->pid != -1)
- os_kill_process(winch->pid, 1);
-
- free_irq(WINCH_IRQ, winch);
- kfree(winch);
-
- return;
-err:
spin_unlock(&winch_handler_lock);
}
-/* XXX: No lock as it's an exitcall... is this valid? Depending on cleanup
- * order... are we sure that nothing else is done on the list? */
static void winch_cleanup(void)
{
- struct list_head *ele;
+ struct list_head *ele, *next;
struct winch *winch;
- list_for_each(ele, &winch_handlers){
+ spin_lock(&winch_handler_lock);
+
+ list_for_each_safe(ele, next, &winch_handlers){
winch = list_entry(ele, struct winch, list);
- if(winch->fd != -1){
- /* Why is this different from the above free_irq(),
- * which deactivates SIGIO? This searches the FD
- * somewhere else and removes it from the list... */
- deactivate_fd(winch->fd, WINCH_IRQ);
- os_close_file(winch->fd);
- }
- if(winch->pid != -1)
- os_kill_process(winch->pid, 1);
+ free_winch(winch);
}
+
+ spin_unlock(&winch_handler_lock);
}
__uml_exitcall(winch_cleanup);
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