Blackfin arch: don't accidently re-enable interrupts

Make sure we don't accidently re-enable interrupts if we are being
called in atomic context

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 13 insertions, 6 deletions

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 5b0667da8d05..f18c2481e9b7 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -1052,8 +1052,9 @@ void show_regs(struct pt_regs *fp)
         char buf [150];
         struct irqaction *action;
         unsigned int i;
-        unsigned long flags;
+        unsigned long flags = 0;
         unsigned int cpu = smp_processor_id();
+        unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
 
         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
@@ -1073,17 +1074,22 @@ void show_regs(struct pt_regs *fp)
         }
         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
                 fp->seqstat & SEQSTAT_EXCAUSE);
-        for (i = 6; i <= 15 ; i++) {
+        for (i = 2; i <= 15 ; i++) {
                 if (fp->ipend & (1 << i)) {
-                        decode_address(buf, bfin_read32(EVT0 + 4*i));
-                        verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
+                        if (i != 4) {
+                                decode_address(buf, bfin_read32(EVT0 + 4*i));
+                                verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
+                        } else
+                                verbose_printk(KERN_NOTICE "  interrupts disabled\n");
                 }
         }
 
         /* if no interrupts are going off, don't print this out */
         if (fp->ipend & ~0x3F) {
                 for (i = 0; i < (NR_IRQS - 1); i++) {
-                        spin_lock_irqsave(&irq_desc[i].lock, flags);
+                        if (!in_atomic)
+                                spin_lock_irqsave(&irq_desc[i].lock, flags);
+
                         action = irq_desc[i].action;
                         if (!action)
                                 goto unlock;
@@ -1096,7 +1102,8 @@ void show_regs(struct pt_regs *fp)
                         }
                         verbose_printk("\n");
 unlock:
-                        spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+                        if (!in_atomic)
+                                spin_unlock_irqrestore(&irq_desc[i].lock, flags);
                 }
         }