Merge branch 'next' into for-linus-3.0

[pandora-kernel.git] / arch / powerpc / sysdev / fsl_rio.c

diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 5b206a2..b3fd081 100644 (file)
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -283,23 +283,24 @@ static void __iomem *rio_regs_win;
 #ifdef CONFIG_E500
 int fsl_rio_mcheck_exception(struct pt_regs *regs)
 {
-       const struct exception_table_entry *entry = NULL;
-       unsigned long reason = mfspr(SPRN_MCSR);
-
-       if (reason & MCSR_BUS_RBERR) {
-               reason = in_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR));
-               if (reason & (RIO_LTLEDCSR_IER | RIO_LTLEDCSR_PRT)) {
-                       /* Check if we are prepared to handle this fault */
-                       entry = search_exception_tables(regs->nip);
-                       if (entry) {
-                               pr_debug("RIO: %s - MC Exception handled\n",
-                                        __func__);
-                               out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR),
-                                        0);
-                               regs->msr |= MSR_RI;
-                               regs->nip = entry->fixup;
-                               return 1;
-                       }
+       const struct exception_table_entry *entry;
+       unsigned long reason;
+
+       if (!rio_regs_win)
+               return 0;
+
+       reason = in_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR));
+       if (reason & (RIO_LTLEDCSR_IER | RIO_LTLEDCSR_PRT)) {
+               /* Check if we are prepared to handle this fault */
+               entry = search_exception_tables(regs->nip);
+               if (entry) {
+                       pr_debug("RIO: %s - MC Exception handled\n",
+                                __func__);
+                       out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR),
+                                0);
+                       regs->msr |= MSR_RI;
+                       regs->nip = entry->fixup;
+                       return 1;
                }
        }