On Wed, Apr 25, 2007 at 05:42:41PM +0900, Tejun Heo wrote:
> Andrew Morton wrote:
> >> [ 2.953862] RIP: 0010:[<ffffffff803ae98b>] [<ffffffff803ae98b>] scsi_schedule_eh+0xa/0x57
> >> [ 3.058672] [<ffffffff803e1e01>] ata_port_schedule_eh+0x4c/0x50
> >> [ 3.064725] [<ffffffff803e1ea7>] ata_port_abort+0xa2/0xae
> >> [ 3.070248] [<ffffffff803e1ef9>] ata_port_freeze+0x46/0x57
> >> [ 3.075853] [<ffffffff803e4c39>] ahci_interrupt+0x300/0x47a
> >> [ 3.081552] [<ffffffff8020eb83>] handle_IRQ_event+0x27/0x57
> >> [ 3.087253] [<ffffffff8029a021>] handle_edge_irq+0xee/0x133
> >> [ 3.092960] [<ffffffff8025f4e1>] do_IRQ+0x6d/0xd5
> >> [ 3.097793] [<ffffffff80255071>] ret_from_intr+0x0/0xa
> >> [ 3.103059] [<ffffffff8024e88b>] mwait_idle+0x46/0x4b
> >> [ 3.108231] [<ffffffff802422f4>] cpu_idle+0x87/0xaa
> >> [ 3.113227] [<ffffffff8025c988>] rest_init+0x49/0x4b
> >> [ 3.118322] [<ffffffff805dca5d>] start_kernel+0x291/0x29c
> >> [ 3.123837] [<ffffffff805dc13a>] _sinittext+0x13a/0x141
> >>
> >
> > So we took an AHCI interrupt when ata_port.scsi_host was still NULL.
> >
> > It appears that ATA is presently requesting its IRQ before allocating all
> > the resources which are needed to handle an interrupt. Does this
> > (resource-leaky) patch fix things?
>
> No, that would break host probing. The port is in frozen (controller
> initialized and IRQs masked off) state, so it's not allowed to take
> interrupt. If interrupt triggers at this point, it's low level driver
> bug. Berck, how reliably can you reproduce this problem? Can you post
> the result of 'lspci -nn'?
Berck, does this patch fix your problem?
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 72c286e..a128717 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1369,10 +1369,14 @@ static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
static void ahci_freeze(struct ata_port *ap)
{
+ void __iomem *mmio = ap->host->iomap[AHCI_PCI_BAR];
void __iomem *port_mmio = ahci_port_base(ap);
/* turn IRQ off */
writel(0, port_mmio + PORT_IRQ_MASK);
+
+ /* clear IRQ pending bit */
+ writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
}
static void ahci_thaw(struct ata_port *ap)
-
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