Björn Steinbrink wrote:
Hm, I don't think it is unhappy about looking at NV_INT_STATUS_CK804.
I'm running 2.6.20-rc5 with the INT_DEV check removed for 8 hours now
without a single problem and that should still look at
NV_INT_STATUS_CK804, right?
I just noticed that my last email might not have been clear enough. The
exceptions happened when I re-enabled the return statement in addition
to the debug message. Without the INT_DEV check, it is completely fine
AFAICT.
Indeed, it seems to be just the NV_INT_DEV check that is problematic.
Here's a patch that's likely better to test, it forces the NV_INT_DEV
flag on when a command is active, and also fixes that questionable code
in nv_host_intr that I mentioned.
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from [email protected]
Home Page: http://www.roberthancock.com/
--- linux-2.6.20-rc5/drivers/ata/sata_nv.c 2007-01-19 19:18:53.000000000 -0600
+++ linux-2.6.20-rc5debug/drivers/ata/sata_nv.c 2007-01-22 22:33:43.000000000 -0600
@@ -700,7 +700,6 @@ static void nv_adma_check_cpb(struct ata
static int nv_host_intr(struct ata_port *ap, u8 irq_stat)
{
struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
- int handled;
/* freeze if hotplugged */
if (unlikely(irq_stat & (NV_INT_ADDED | NV_INT_REMOVED))) {
@@ -719,13 +718,7 @@ static int nv_host_intr(struct ata_port
}
/* handle interrupt */
- handled = ata_host_intr(ap, qc);
- if (unlikely(!handled)) {
- /* spurious, clear it */
- ata_check_status(ap);
- }
-
- return 1;
+ return ata_host_intr(ap, qc);
}
static irqreturn_t nv_adma_interrupt(int irq, void *dev_instance)
@@ -752,6 +745,11 @@ static irqreturn_t nv_adma_interrupt(int
if (pp->flags & NV_ADMA_PORT_REGISTER_MODE) {
u8 irq_stat = readb(host->mmio_base + NV_INT_STATUS_CK804)
>> (NV_INT_PORT_SHIFT * i);
+ if(ata_tag_valid(ap->active_tag))
+ /** NV_INT_DEV indication seems unreliable at times
+ at least in ADMA mode. Force it on always when a
+ command is active, to prevent losing interrupts. */
+ irq_stat |= NV_INT_DEV;
handled += nv_host_intr(ap, irq_stat);
continue;
}
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