ARC: dw2 unwind: Catch Dwarf SNAFUs early

Instead of seeing empty stack traces, let kernel fail early so dwarf
issues can be fixed sooner

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/arch/arc/kernel/unwind.c b/arch/arc/kernel/unwind.c
index f34599abe182..5eb707640e9c 100644
--- a/arch/arc/kernel/unwind.c
+++ b/arch/arc/kernel/unwind.c
@@ -296,10 +296,10 @@ static void init_unwind_hdr(struct unwind_table *table,
                 if (cie == &not_fde)
                         continue;
                 if (cie == NULL || cie == &bad_cie)
-                        return;
+                        goto ret_err;
                 ptrType = fde_pointer_type(cie);
                 if (ptrType < 0)
-                        return;
+                        goto ret_err;
 
                 ptr = (const u8 *)(fde + 2);
                 if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde,
@@ -315,14 +315,14 @@ static void init_unwind_hdr(struct unwind_table *table,
         }
 
         if (tableSize || !n)
-                return;
+                goto ret_err;
 
         hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int)
             + 2 * n * sizeof(unsigned long);
 
         header = alloc(hdrSize);
         if (!header)
-                return;
+                goto ret_err;
 
         header->version = 1;
         header->eh_frame_ptr_enc = DW_EH_PE_abs | DW_EH_PE_native;
@@ -361,6 +361,10 @@ static void init_unwind_hdr(struct unwind_table *table,
         table->hdrsz = hdrSize;
         smp_wmb();
         table->header = (const void *)header;
+        return;
+
+ret_err:
+        panic("Attention !!! Dwarf FDE parsing errors\n");;
 }
 
 #ifdef CONFIG_MODULES