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authorAlexander Gordeev <agordeev@redhat.com>2014-09-29 18:26:01 +0200
committerTejun Heo <tj@kernel.org>2014-10-06 11:43:36 -0400
commit227dfb4dbf109596d76a9b842856c4ff68e4efb2 (patch)
tree21d347c6ee2f4d53fffd158bab63acecd23d9a39 /drivers/ata/ahci.h
parent5ee1cfd975518bc9cdcd79e0b76552b5ae5c8c1e (diff)
AHCI: Do not read HOST_IRQ_STAT reg in multi-MSI mode
As described in AHCI v1.0 specification chapter 10.6.2.2 "Multiple MSI Based Messages" generation of interrupts is not controlled through the HOST_IRQ_STAT register. Considering MMIO access is expensive remove unnecessary reading and writing of HOST_IRQ_STAT register. Further, serializing access to the host data is no longer needed and the interrupt service routine can avoid competing on the host lock. Signed-off-by: Alexander Gordeev <agordeev@redhat.com> Suggested-by: "Jiang, Dave" <dave.jiang@intel.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: "Jiang, Dave" <dave.jiang@intel.com> Cc: linux-ide@vger.kernel.org
Diffstat (limited to 'drivers/ata/ahci.h')
-rw-r--r--drivers/ata/ahci.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 6a22055151f0..40f0e34f17af 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -304,7 +304,7 @@ struct ahci_port_priv {
unsigned int ncq_saw_d2h:1;
unsigned int ncq_saw_dmas:1;
unsigned int ncq_saw_sdb:1;
- u32 intr_status; /* interrupts to handle */
+ atomic_t intr_status; /* interrupts to handle */
spinlock_t lock; /* protects parent ata_port */
u32 intr_mask; /* interrupts to enable */
bool fbs_supported; /* set iff FBS is supported */