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| author | Mikael Pettersson <mikpe@it.uu.se> | 2008-05-17 18:47:35 +0200 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-05-19 17:30:47 -0400 |
| commit | a13db78e2209ebfe1898207f53c353ed836d4a53 (patch) | |
| tree | 6e20091316cf2742825ef3f17e8069391657b6f0 /drivers/ata | |
| parent | 07633b5d0723ce2ec31262e1096dcf61311bf078 (diff) | |
| download | lwn-a13db78e2209ebfe1898207f53c353ed836d4a53.tar.gz lwn-a13db78e2209ebfe1898207f53c353ed836d4a53.zip | |
sata_promise: fix irq clearing buglets
This patch fixes two bugs in sata_promise's irq status clearing paths:
1. When clearing the irq status for a specific port, the driver
read the global SEQMASK register. This is wrong because that
clears the irq status for _all_ ports.
2. pdc_thaw() incorrectly added the PDC_INT_SEQMASK host register
offset to a per-port ata engine base address. This resulted in
it reading the unrelated PDC_PKT_SUBMIT register, which did not
have the desired irq status clearing effect.
In both cases the fix is to read from the port's Command/Status
register. This also matches what Promise's own driver does.
Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/sata_promise.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c index 5a10dc5048ad..f5ea06bbde75 100644 --- a/drivers/ata/sata_promise.c +++ b/drivers/ata/sata_promise.c @@ -663,7 +663,7 @@ static void pdc_thaw(struct ata_port *ap) u32 tmp; /* clear IRQ */ - readl(mmio + PDC_INT_SEQMASK); + readl(mmio + PDC_COMMAND); /* turn IRQ back on */ tmp = readl(mmio + PDC_CTLSTAT); @@ -781,10 +781,9 @@ static inline unsigned int pdc_host_intr(struct ata_port *ap, static void pdc_irq_clear(struct ata_port *ap) { - struct ata_host *host = ap->host; - void __iomem *mmio = host->iomap[PDC_MMIO_BAR]; + void __iomem *mmio = ap->ioaddr.cmd_addr; - readl(mmio + PDC_INT_SEQMASK); + readl(mmio + PDC_COMMAND); } static irqreturn_t pdc_interrupt(int irq, void *dev_instance) |