vserver 1.9.5.x5

[linux-2.6.git] / arch / i386 / kernel / vm86.c

diff --git a/arch/i386/kernel/vm86.c b/arch/i386/kernel/vm86.c
index 483e9b2..2dd216a 100644 (file)
--- a/arch/i386/kernel/vm86.c
+++ b/arch/i386/kernel/vm86.c
@@ -137,6 +137,7 @@ struct pt_regs * fastcall save_v86_state(struct kernel_vm86_regs * regs)
 static void mark_screen_rdonly(struct task_struct * tsk)
 {
        pgd_t *pgd;
+       pud_t *pud;
        pmd_t *pmd;
        pte_t *pte, *mapped;
        int i;
@@ -151,7 +152,15 @@ static void mark_screen_rdonly(struct task_struct * tsk)
                pgd_clear(pgd);
                goto out;
        }
-       pmd = pmd_offset(pgd, 0xA0000);
+       pud = pud_offset(pgd, 0xA0000);
+       if (pud_none(*pud))
+               goto out;
+       if (pud_bad(*pud)) {
+               pud_ERROR(*pud);
+               pud_clear(pud);
+               goto out;
+       }
+       pmd = pmd_offset(pud, 0xA0000);
        if (pmd_none(*pmd))
                goto out;
        if (pmd_bad(*pmd)) {
@@ -704,7 +713,7 @@ static struct vm86_irqs {
        int sig;
 } vm86_irqs[16];
 
-static spinlock_t irqbits_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(irqbits_lock);
 static int irqbits;
 
 #define ALLOWED_SIGS ( 1 /* 0 = don't send a signal */ \
@@ -723,7 +732,14 @@ static irqreturn_t irq_handler(int intno, void *dev_id, struct pt_regs * regs)
        irqbits |= irq_bit;
        if (vm86_irqs[intno].sig)
                send_sig(vm86_irqs[intno].sig, vm86_irqs[intno].tsk, 1);
-       /* else user will poll for IRQs */
+       spin_unlock_irqrestore(&irqbits_lock, flags);
+       /*
+        * IRQ will be re-enabled when user asks for the irq (whether
+        * polling or as a result of the signal)
+        */
+       disable_irq(intno);
+       return IRQ_HANDLED;
+
 out:
        spin_unlock_irqrestore(&irqbits_lock, flags);   
        return IRQ_NONE;
@@ -741,7 +757,7 @@ static inline void free_vm86_irq(int irqnumber)
        spin_unlock_irqrestore(&irqbits_lock, flags);   
 }
 
-void release_x86_irqs(struct task_struct *task)
+void release_vm86_irqs(struct task_struct *task)
 {
        int i;
        for (i = FIRST_VM86_IRQ ; i <= LAST_VM86_IRQ; i++)