[PATCH 40/62] Blackfin: add workaround for anomaly 05000461

[Mike Frysinger]

From: Robin Getz <robin.getz@xxxxxxxxxx>

Returning too fast with a bad RETI can trigger false errors.

Signed-off-by: Robin Getz <robin.getz@xxxxxxxxxx>
Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx>
---
 arch/blackfin/kernel/traps.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 0d04a47..778a756 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -594,6 +594,9 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		force_sig_info(sig, &info, current);
 	}
 
+	if (ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8))
+		fp->pc = SAFE_USER_INSTRUCTION;
+
 	trace_buffer_restore(j);
 	return;
 }
-- 
1.6.3.1

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