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authorTejun Heo <tj@kernel.org>2008-06-28 01:49:02 +0900
committerJeff Garzik <jgarzik@redhat.com>2008-07-04 09:05:59 -0400
commitea0c62f7cf70f13a67830471b613337bd0c9a62e (patch)
treef57ec0dbe1f2ed1f8f038a0059ae4c72e98e602a
parent464b3286b4aa459059c6fda85ba55185fd21d9fc (diff)
ahci: always clear all bits in irq_stat
Some AHCI controllers (ICH7 was reported) set pending bit in HOST_IRQ_STAT for non-existent ports and when it's not cleared falls into IRQ storm. Always clear full irq_stat instead of only the bits that are handled. As nothing changes for recognized ports, the risk of breaking things is pretty low. Reported and verified by Philipp Thomas in the following suse bugzilla. https://bugzilla.novell.com/attachment.cgi?id=215692 Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Philipp Thomas <pth@novell.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
-rw-r--r--drivers/ata/ahci.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 6a4a2a25d97..061817a3a0e 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1777,7 +1777,7 @@ static irqreturn_t ahci_interrupt(int irq, void *dev_instance)
struct ahci_host_priv *hpriv;
unsigned int i, handled = 0;
void __iomem *mmio;
- u32 irq_stat, irq_ack = 0;
+ u32 irq_stat;
VPRINTK("ENTER\n");
@@ -1809,14 +1809,11 @@ static irqreturn_t ahci_interrupt(int irq, void *dev_instance)
"interrupt on disabled port %u\n", i);
}
- irq_ack |= (1 << i);
- }
-
- if (irq_ack) {
- writel(irq_ack, mmio + HOST_IRQ_STAT);
handled = 1;
}
+ writel(irq_stat, mmio + HOST_IRQ_STAT);
+
spin_unlock(&host->lock);
VPRINTK("EXIT\n");