ARC: Use correct PTAG register for icache flush

This fixes a subtle issue with cache flush which could potentially cause
random userspace crashes because of stale icache lines.

This error crept in when consolidating the cache flush code

Fixes: bd12976c3664 (ARC: cacheflush refactor #3: Unify the {d,i}cache)
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org  # 3.13
Cc: arc-linux-dev@synopsys.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c
index 6b58c1de7577..400c663b21c2 100644
--- a/arch/arc/mm/cache_arc700.c
+++ b/arch/arc/mm/cache_arc700.c
@@ -282,7 +282,7 @@ static inline void __cache_line_loop(unsigned long paddr, unsigned long vaddr,
 #else
         /* if V-P const for loop, PTAG can be written once outside loop */
         if (full_page_op)
-                write_aux_reg(ARC_REG_DC_PTAG, paddr);
+                write_aux_reg(aux_tag, paddr);
 #endif
 
         while (num_lines-- > 0) {
@@ -296,7 +296,7 @@ static inline void __cache_line_loop(unsigned long paddr, unsigned long vaddr,
                 write_aux_reg(aux_cmd, vaddr);
                 vaddr += L1_CACHE_BYTES;
 #else
-                write_aux_reg(aux, paddr);
+                write_aux_reg(aux_cmd, paddr);
                 paddr += L1_CACHE_BYTES;
 #endif
         }