[Blackfin] arch: fix bug - trap_tests fails to recover on some tests.

http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3719

When the CPLBs get a miss, we do:
  - find a victim in the HW table
  - remove the victim
  - find the replacement in the software table
  - put it into the HW table.

If we can't find a replacement in the software table, we accidently
leave a duplicate in the HW table. This patch ensures that duplicate
is marked as not valid.

What we should do is find the replacement in the software table, before
we find a victim in the HW table - but its too late in the release cycle
to do that much restructuring of this code.

Rather that duplicate code, connect Hardware Errors (irq5) into trap_c,
so user space processes get killed properly.

The rest of irq_panic() can be moved into traps.c (later)

There is still a small corner case that causes problems when a
pheriperal interrupt goes off a single cycle before a user space
hardware error. This causes a kernel panic, rather than the user
space process being killed.

But, this checkin makes things work in 99.9% of the cases, and is a vast
improvement from what is there today (which fails 100% of the time).

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 0 insertions, 50 deletions

diff --git a/arch/blackfin/mach-common/irqpanic.c b/arch/blackfin/mach-common/irqpanic.c
index b22959b197e5..606ded9ff4e1 100644
--- a/arch/blackfin/mach-common/irqpanic.c
+++ b/arch/blackfin/mach-common/irqpanic.c
@@ -46,9 +46,6 @@ void irq_panic(int reason, struct pt_regs *regs) __attribute__ ((l1_text));
  */
 asmlinkage void irq_panic(int reason, struct pt_regs *regs)
 {
-        int sig = 0;
-        siginfo_t info;
-
 #ifdef CONFIG_DEBUG_ICACHE_CHECK
         unsigned int cmd, tag, ca, cache_hi, cache_lo, *pa;
         unsigned short i, j, die;
@@ -136,53 +133,6 @@ asmlinkage void irq_panic(int reason, struct pt_regs *regs)
         }
 #endif
 
-        printk(KERN_EMERG "\n");
-        printk(KERN_EMERG "Exception: IRQ 0x%x entered\n", reason);
-        printk(KERN_EMERG " code=[0x%08lx],   stack frame=0x%08lx,  "
-            " bad PC=0x%08lx\n",
-            (unsigned long)regs->seqstat,
-            (unsigned long)regs,
-            (unsigned long)regs->pc);
-        if (reason == 0x5) {
-                printk(KERN_EMERG "----------- HARDWARE ERROR -----------\n");
-
-                /* There is only need to check for Hardware Errors, since other
-                 * EXCEPTIONS are handled in TRAPS.c (MH)
-                 */
-                switch (regs->seqstat & SEQSTAT_HWERRCAUSE) {
-                case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):   /* System MMR Error */
-                        info.si_code = BUS_ADRALN;
-                        sig = SIGBUS;
-                        printk(KERN_EMERG HWC_x2(KERN_EMERG));
-                        break;
-                case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):  /* External Memory Addressing Error */
-                        info.si_code = BUS_ADRERR;
-                        sig = SIGBUS;
-                        printk(KERN_EMERG HWC_x3(KERN_EMERG));
-                        break;
-                case (SEQSTAT_HWERRCAUSE_PERF_FLOW):    /* Performance Monitor Overflow */
-                        printk(KERN_EMERG HWC_x12(KERN_EMERG));
-                        break;
-                case (SEQSTAT_HWERRCAUSE_RAISE_5):      /* RAISE 5 instruction */
-                        printk(KERN_EMERG HWC_x18(KERN_EMERG));
-                        break;
-                default:        /* Reserved */
-                        printk(KERN_EMERG HWC_default(KERN_EMERG));
-                        break;
-                }
-        }
-
-        regs->ipend = bfin_read_IPEND();
-        dump_bfin_process(regs);
-        dump_bfin_mem((void *)regs->pc);
-        show_regs(regs);
-        if (0 == (info.si_signo = sig) || 0 == user_mode(regs)) /* in kernelspace */
-                panic("Unhandled IRQ or exceptions!\n");
-        else {                  /* in userspace */
-                info.si_errno = 0;
-                info.si_addr = (void *)regs->pc;
-                force_sig_info(sig, &info, current);
-        }
 }
 
 #ifdef CONFIG_HARDWARE_PM