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authorDave Jones <davej@redhat.com>2005-11-07 14:02:58 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2005-12-14 15:42:58 -0800
commit73db2c2525cf8888e229189480e295817680df85 (patch)
tree820eadbfb69b90228e55d83ece1bf7b44ff0205f /drivers
parent28e52c66f8fa3d112036b5539d80eaf90a9693b6 (diff)
[PATCH] AGPGART: Fix serverworks TLB flush.
[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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/agp/sworks-agp.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/char/agp/sworks-agp.c b/drivers/char/agp/sworks-agp.c
index a9fb12c20eb7..53968973f890 100644
--- a/drivers/char/agp/sworks-agp.c
+++ b/drivers/char/agp/sworks-agp.c
@@ -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)