diff options
| author | Maxime Bizon <mbizon@freebox.fr> | 2011-03-16 14:58:32 +0100 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2011-04-24 11:34:05 -0400 |
| commit | 7b3a24c57d2eeda8dba9c205342b12689c4679f9 (patch) | |
| tree | f4be496d3c0008c6b601b75616383bb735bc9fd2 /drivers/ata/libahci.c | |
| parent | ae01b2493c3bf03c504c32ac4ebb01d528508db3 (diff) | |
ahci: don't enable port irq before handler is registered
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>
Diffstat (limited to 'drivers/ata/libahci.c')
| -rw-r--r-- | drivers/ata/libahci.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 633159b5152a..d38c40fe4ddb 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -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) |