Blackfin: SMP: kgdb: flush core internal write buffer before flushinv

KGDB single step in SMP kernel may hang forever in flushinv without a
CSYNC ahead.  This is because the core internal write buffers need to
be flushed before invalidating the data cache to make sure the insn
fetch is not out of sync.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/blackfin/mach-bf561/atomic.S b/arch/blackfin/mach-bf561/atomic.S
index f99f174b129f..52d6f73fcced 100644
--- a/arch/blackfin/mach-bf561/atomic.S
+++ b/arch/blackfin/mach-bf561/atomic.S
@@ -49,6 +49,7 @@ ENTRY(_get_core_lock)
         jump .Lretry_corelock
 .Ldone_corelock:
         p0 = r1;
+        /* flush core internal write buffer before invalidate dcache */
         CSYNC(r2);
         flushinv[p0];
         SSYNC(r2);
@@ -685,6 +686,8 @@ ENTRY(___raw_atomic_test_asm)
         r1 = -L1_CACHE_BYTES;
         r1 = r0 & r1;
         p0 = r1;
+        /* flush core internal write buffer before invalidate dcache */
+        CSYNC(r2);
         flushinv[p0];
         SSYNC(r2);
         r0 = [p1];
@@ -907,6 +910,8 @@ ENTRY(___raw_uncached_fetch_asm)
         r1 = -L1_CACHE_BYTES;
         r1 = r0 & r1;
         p0 = r1;
+        /* flush core internal write buffer before invalidate dcache */
+        CSYNC(r2);
         flushinv[p0];
         SSYNC(r2);
         r0 = [p1];