1 files changed, 47 insertions, 31 deletions

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 56464cb8edf3..d3cbcd6bd985 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -1,30 +1,7 @@
 /*
- * File:         arch/blackfin/kernel/traps.c
- * Based on:
- * Author:       Hamish Macdonald
+ * Copyright 2004-2009 Analog Devices Inc.
  *
- * Created:
- * Description:  uses S/W interrupt 15 for the system calls
- *
- * Modified:
- *               Copyright 2004-2006 Analog Devices Inc.
- *
- * Bugs:         Enter bugs at http://blackfin.uclinux.org/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ * Licensed under the GPL-2 or later
  */
 
 #include <linux/bug.h>
@@ -142,6 +119,15 @@ static void decode_address(char *buf, unsigned long address)
                 return;
         }
 
+        /*
+         * Don't walk any of the vmas if we are oopsing, it has been known
+         * to cause problems - corrupt vmas (kernel crashes) cause double faults
+         */
+        if (oops_in_progress) {
+                strcat(buf, "/* kernel dynamic memory (maybe user-space) */");
+                return;
+        }
+
         /* looks like we're off in user-land, so let's walk all the
          * mappings of all our processes and see if we can't be a whee
          * bit more specific
@@ -538,6 +524,36 @@ asmlinkage notrace void trap_c(struct pt_regs *fp)
                         break;
                 /* External Memory Addressing Error */
                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
+                        if (ANOMALY_05000310) {
+                                static unsigned long anomaly_rets;
+
+                                if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
+                                    (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
+                                        /*
+                                         * A false hardware error will happen while fetching at
+                                         * the L1 instruction SRAM boundary.  Ignore it.
+                                         */
+                                        anomaly_rets = fp->rets;
+                                        goto traps_done;
+                                } else if (fp->rets == anomaly_rets) {
+                                        /*
+                                         * While boundary code returns to a function, at the ret
+                                         * point, a new false hardware error might occur too based
+                                         * on tests.  Ignore it too.
+                                         */
+                                        goto traps_done;
+                                } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
+                                           (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
+                                        /*
+                                         * If boundary code calls a function, at the entry point,
+                                         * a new false hardware error maybe happen based on tests.
+                                         * Ignore it too.
+                                         */
+                                        goto traps_done;
+                                } else
+                                        anomaly_rets = 0;
+                        }
+
                         info.si_code = BUS_ADRERR;
                         sig = SIGBUS;
                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
@@ -642,7 +658,7 @@ asmlinkage notrace void trap_c(struct pt_regs *fp)
 
 /*
  * Similar to get_user, do some address checking, then dereference
- * Return true on sucess, false on bad address
+ * Return true on success, false on bad address
  */
 static bool get_instruction(unsigned short *val, unsigned short *address)
 {
@@ -999,12 +1015,12 @@ void dump_bfin_process(struct pt_regs *fp)
             !((unsigned long)current & 0x3) && current->pid) {
                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
                 if (current->comm >= (char *)FIXED_CODE_START)
-                        verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
+                        verbose_printk(KERN_NOTICE "COMM=%s PID=%d",
                                 current->comm, current->pid);
                 else
-                        verbose_printk(KERN_NOTICE "COMM= invalid\n");
+                        verbose_printk(KERN_NOTICE "COMM= invalid");
 
-                printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
+                printk(KERN_CONT " CPU=%d\n", current_thread_info()->cpu);
                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
                         verbose_printk(KERN_NOTICE
                                 "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
@@ -1163,7 +1179,7 @@ void show_regs(struct pt_regs *fp)
         if (fp->ipend & ~0x3F) {
                 for (i = 0; i < (NR_IRQS - 1); i++) {
                         if (!in_atomic)
-                                spin_lock_irqsave(&irq_desc[i].lock, flags);
+                                raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
 
                         action = irq_desc[i].action;
                         if (!action)
@@ -1178,7 +1194,7 @@ void show_regs(struct pt_regs *fp)
                         verbose_printk("\n");
 unlock:
                         if (!in_atomic)
-                                spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+                                raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
                 }
         }