[PATCH v4 2/2] powerpc: sstep: Fix darn emulation

[Sandipan Das]

Commit 8813ff49607e ("powerpc/sstep: Check instruction
validity against ISA version before emulation") introduced
a proper way to skip unknown instructions. This makes sure
that the same is used for the darn instruction when the
range selection bits have a reserved value.

Fixes: a23987ef267a ("powerpc: sstep: Add support for darn instruction")
Signed-off-by: Sandipan Das <sandipan at linux.ibm.com>
---
 arch/powerpc/lib/sstep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 11f14b209d7f..683f7c20f74b 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1916,7 +1916,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 				goto compute_done;
 			}
 
-			return -1;
+			goto unknown_opcode;
 #ifdef __powerpc64__
 		case 777:	/* modsd */
 			if (!cpu_has_feature(CPU_FTR_ARCH_300))
-- 
2.25.1