[PATCH] video/aty/mach64_ct.c: fix bogus delay loop

CT based mach64 cards were reported to hang on sparc64 boxes when
compiled with gcc-4.1.x and later.

Looking at this piece of code, it's no surprise.  A critical
delay was implemented as an empty for() loop, and gcc 4.0.x
and previous did not optimize it away, so we did get a delay.

But gcc-4.1.x and later can optimize it away, and we get crashes.

Use a real udelay() to fix this.  Fix verified on SunBlade100.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/video/aty/mach64_ct.c b/drivers/video/aty/mach64_ct.c
index f3b487b8710b..1fdcfdbf669b 100644
--- a/drivers/video/aty/mach64_ct.c
+++ b/drivers/video/aty/mach64_ct.c
@@ -598,7 +598,6 @@ static void aty_resume_pll_ct(const struct fb_info *info,
         struct atyfb_par *par = info->par;
 
         if (par->mclk_per != par->xclk_per) {
-                int i;
                 /*
                 * This disables the sclk, crashes the computer as reported:
                 * aty_st_pll_ct(SPLL_CNTL2, 3, info);
@@ -614,7 +613,7 @@ static void aty_resume_pll_ct(const struct fb_info *info,
                  * helps for Rage Mobilities that sometimes crash when
                  * we switch to sclk. (Daniel Mantione, 13-05-2003)
                  */
-                for (i=0;i<=0x1ffff;i++);
+                udelay(500);
         }
 
         aty_st_pll_ct(PLL_REF_DIV, pll->ct.pll_ref_div, par);