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[PATCH] AGPGART: Fix serverworks TLB flush.

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[AGPGART] Fix serverworks TLB flush.
Go back to what 2.4 kernels used to do here, as if this hits,
the kernel just hangs indefinitly.

Actually an improvement over 2.4 - we now break; out of the loop
instead of just printing messages on timeouts.

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dave Jones 2005-11-07 14:02:58 -08:00 committed by Greg Kroah-Hartman
parent 28e52c66f8
commit 73db2c2525
1 changed files with 16 additions and 2 deletions
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18
drivers/char/agp/sworks-agp.c
View file

@ -242,13 +242,27 @@ static int serverworks_fetch_size(void)
*/
static void serverworks_tlbflush(struct agp_memory *temp)
{
unsigned long timeout;
writeb(1, serverworks_private.registers+SVWRKS_POSTFLUSH);
while (readb(serverworks_private.registers+SVWRKS_POSTFLUSH) == 1)
timeout = jiffies + 3*HZ;
while (readb(serverworks_private.registers+SVWRKS_POSTFLUSH) == 1) {
cpu_relax();
if (time_after(jiffies, timeout)) {
printk(KERN_ERR PFX "TLB post flush took more than 3 seconds\n");
break;
}
}
writel(1, serverworks_private.registers+SVWRKS_DIRFLUSH);
while(readl(serverworks_private.registers+SVWRKS_DIRFLUSH) == 1)
timeout = jiffies + 3*HZ;
while (readl(serverworks_private.registers+SVWRKS_DIRFLUSH) == 1) {
cpu_relax();
if (time_after(jiffies, timeout)) {
printk(KERN_ERR PFX "TLB Dir flush took more than 3 seconds\n");
break;
}
}
}
static int serverworks_configure(void)