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ahci: don't enable port irq before handler is registered

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The ahci_pmp_attach() & ahci_pmp_detach() unmask port irqs, but they
are also called during port initialization, before ahci host irq
handler is registered. On ce4100 platform, this sometimes triggers
"irq 4: nobody cared" message when loading driver.

Fixed this by not touching the register if the port is in frozen
state, and mark all uninitialized port as frozen.

Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Maxime Bizon 2011-03-16 14:58:32 +01:00 committed by Jeff Garzik
parent ae01b2493c
commit 7b3a24c57d
2 changed files with 16 additions and 3 deletions
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17
drivers/ata/libahci.c
View File

@ -1919,7 +1919,17 @@ static void ahci_pmp_attach(struct ata_port *ap)
ahci_enable_fbs(ap);
pp->intr_mask |= PORT_IRQ_BAD_PMP;
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
/*
* We must not change the port interrupt mask register if the
* port is marked frozen, the value in pp->intr_mask will be
* restored later when the port is thawed.
*
* Note that during initialization, the port is marked as
* frozen since the irq handler is not yet registered.
*/
if (!(ap->pflags & ATA_PFLAG_FROZEN))
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
}
static void ahci_pmp_detach(struct ata_port *ap)
@ -1935,7 +1945,10 @@ static void ahci_pmp_detach(struct ata_port *ap)
writel(cmd, port_mmio + PORT_CMD);
pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
/* see comment above in ahci_pmp_attach() */
if (!(ap->pflags & ATA_PFLAG_FROZEN))
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
}
int ahci_port_resume(struct ata_port *ap)

2
drivers/ata/libata-core.c
View File

@ -5480,7 +5480,7 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
if (!ap)
return NULL;
ap->pflags |= ATA_PFLAG_INITIALIZING;
ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
ap->lock = &host->lock;
ap->print_id = -1;
ap->host = host;