Blackfin: work around anomaly 05000281

Add missing anomaly workaround for anomaly 05000281 - we can't return to
instructions which cause hardware errors otherwise we trigger the error
again which means we go into an infinite loop of handling, returning, and
retriggering.  This work around confuses gdb when the error occurs as the
PC will seemed to have moved, so a better long term fix will need to be
figured out, but for now this is better than an infinite crash loop.

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 8a1caf2bb5b9defa94dc1fff7c6803afb3324fad..664de56296cbcb1e1198bf9d668214eb55eef129 100644 (file)
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -619,7 +619,8 @@ 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))
+       if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
+               (ANOMALY_05000281 && trapnr == VEC_HWERR))
                fp->pc = SAFE_USER_INSTRUCTION;
 
  traps_done: