target/linux/coldfire/patches/028-mcfv4e_cache_ck_0_len.patch

   1 From 679a5be6f06b909adccc9c588feb26bf6d6df402 Mon Sep 17 00:00:00 2001
   2 From: Kurt Mahan <kmahan@freescale.com>
   3 Date: Thu, 6 Dec 2007 16:40:39 -0700
   4 Subject: [PATCH] Add zero length checking to cache routines.
   5
   6 LTIBName: mcfv4e-cache-ck-0-len
   7 Signed-off-by: Kurt Mahan <kmahan@freescale.com>
   8 ---
   9  include/asm-m68k/cf_cacheflush.h |   14 +++++++++++---
  10  1 files changed, 11 insertions(+), 3 deletions(-)
  11
  12 --- a/include/asm-m68k/cf_cacheflush.h
  13 +++ b/include/asm-m68k/cf_cacheflush.h
  14 @@ -127,7 +127,9 @@ static inline void flush_bcache(void)
  15  static inline void cf_cache_clear(unsigned long paddr, int len)
  16  {
  17         /* number of lines */
  18 -       len =  (len + (CACHE_LINE_SIZE-1)) / CACHE_LINE_SIZE;
  19 +       len = (len + (CACHE_LINE_SIZE-1)) / CACHE_LINE_SIZE;
  20 +       if (len == 0)
  21 +               return;
  22
  23         /* align on set boundary */
  24         paddr &= 0xfffffff0;
  25 @@ -161,7 +163,9 @@ static inline void cf_cache_clear(unsign
  26  static inline void cf_cache_push(unsigned long paddr, int len)
  27  {
  28         /* number of lines */
  29 -       len =  (len + (CACHE_LINE_SIZE-1)) / CACHE_LINE_SIZE;
  30 +       len = (len + (CACHE_LINE_SIZE-1)) / CACHE_LINE_SIZE;
  31 +       if (len == 0)
  32 +               return;
  33
  34         /* align on set boundary */
  35         paddr &= 0xfffffff0;
  36 @@ -195,7 +199,9 @@ static inline void cf_cache_push(unsigne
  37  static inline void cf_cache_flush(unsigned long paddr, int len)
  38  {
  39         /* number of lines */
  40 -       len =  (len + (CACHE_LINE_SIZE-1)) / CACHE_LINE_SIZE;
  41 +       len = (len + (CACHE_LINE_SIZE-1)) / CACHE_LINE_SIZE;
  42 +       if (len == 0)
  43 +               return;
  44
  45         /* align on set boundary */
  46         paddr &= 0xfffffff0;
  47 @@ -234,6 +240,8 @@ static inline void cf_cache_flush_range(
  48         vstart &= 0xfffffff0;
  49         vend = PAGE_ALIGN((vend + (CACHE_LINE_SIZE-1))) & 0xfffffff0;
  50         len = vend - vstart;
  51 +       if (len == 0)
  52 +               return;
  53         vstart = __pa(vstart);
  54         vend = vstart + len;
  55