fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / um / kernel / irq.c

diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 1e766ce..5c1e611 100644 (file)
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -31,6 +31,7 @@
 #include "irq_kern.h"
 #include "os.h"
 #include "sigio.h"
+#include "um_malloc.h"
 #include "misc_constants.h"
 
 /*
@@ -141,19 +142,6 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
                                     .events            = events,
                                     .current_events    = 0 } );
 
-       /* Critical section - locked by a spinlock because this stuff can
-        * be changed from interrupt handlers.  The stuff above is done
-        * outside the lock because it allocates memory.
-        */
-
-       /* Actually, it only looks like it can be called from interrupt
-        * context.  The culprit is reactivate_fd, which calls
-        * maybe_sigio_broken, which calls write_sigio_workaround,
-        * which calls activate_fd.  However, write_sigio_workaround should
-        * only be called once, at boot time.  That would make it clear that
-        * this is called only from process context, and can be locked with
-        * a semaphore.
-        */
        spin_lock_irqsave(&irq_lock, flags);
        for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) {
                if ((irq_fd->fd == fd) && (irq_fd->type == type)) {
@@ -164,7 +152,6 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
                }
        }
 
-       /*-------------*/
        if (type == IRQ_WRITE)
                fd = -1;
 
@@ -197,7 +184,6 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
 
                spin_lock_irqsave(&irq_lock, flags);
        }
-       /*-------------*/
 
        *last_irq_ptr = new_fd;
        last_irq_ptr = &new_fd->next;
@@ -209,14 +195,14 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
         */
        maybe_sigio_broken(fd, (type == IRQ_READ));
 
-       return(0);
+       return 0;
 
  out_unlock:
        spin_unlock_irqrestore(&irq_lock, flags);
  out_kfree:
        kfree(new_fd);
  out:
-       return(err);
+       return err;
 }
 
 static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
@@ -301,10 +287,7 @@ void reactivate_fd(int fd, int irqnum)
        os_set_pollfd(i, irq->fd);
        spin_unlock_irqrestore(&irq_lock, flags);
 
-       /* This calls activate_fd, so it has to be outside the critical
-        * section.
-        */
-       maybe_sigio_broken(fd, (irq->type == IRQ_READ));
+       add_sigio_fd(fd);
 }
 
 void deactivate_fd(int fd, int irqnum)
@@ -315,11 +298,15 @@ void deactivate_fd(int fd, int irqnum)
 
        spin_lock_irqsave(&irq_lock, flags);
        irq = find_irq_by_fd(fd, irqnum, &i);
-       if (irq == NULL)
-               goto out;
+       if(irq == NULL){
+               spin_unlock_irqrestore(&irq_lock, flags);
+               return;
+       }
+
        os_set_pollfd(i, -1);
- out:
        spin_unlock_irqrestore(&irq_lock, flags);
+
+       ignore_sigio_fd(fd);
 }
 
 int deactivate_all_fds(void)
@@ -369,14 +356,16 @@ void forward_interrupts(int pid)
  */
 unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
 {
-       irq_enter();
-       __do_IRQ(irq, (struct pt_regs *)regs);
-       irq_exit();
-       return 1;
+       struct pt_regs *old_regs = set_irq_regs((struct pt_regs *)regs);
+       irq_enter();
+       __do_IRQ(irq);
+       irq_exit();
+       set_irq_regs(old_regs);
+       return 1;
 }
 
 int um_request_irq(unsigned int irq, int fd, int type,
-                  irqreturn_t (*handler)(int, void *, struct pt_regs *),
+                  irq_handler_t handler,
                   unsigned long irqflags, const char * devname,
                   void *dev_id)
 {
@@ -437,8 +426,7 @@ void __init init_IRQ(void)
        }
 }
 
-int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *,
-                                                            struct pt_regs *))
+int init_aio_irq(int irq, char *name, irq_handler_t handler)
 {
        int fds[2], err;