From: Robin Getz <robin.getz@analog.com>
Date: Mon, 11 May 2009 18:55:16 +0000 (+0000)
Subject: Blackfin: add workaround for anomaly 05000461
X-Git-Tag: v2.6.31-rc1~361^2~22
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=0acad8dfee6bde7e246a95a52f864a8eee777ed8;p=linux.git

Blackfin: add workaround for anomaly 05000461

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

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 0d04a4732b1f..778a75655a0c 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;
 }