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authorSergei Shtylyov <sergei.shtylyov@cogentembedded.com>2013-06-01 02:38:35 +0400
committerTejun Heo <tj@kernel.org>2013-06-02 00:54:45 -0700
commit52a2a1087b5924de00484f35ef5e2a73f61dbd22 (patch)
treeb1887001bdf51e25024fc288552d6bead78b6f1e
parentfcce9a35f8faaa1f52236c554ef1b15d99a7537e (diff)
downloadvexpress-lsk-52a2a1087b5924de00484f35ef5e2a73f61dbd22.tar.gz
sata_rcar: fix interrupt handling
The driver's interrupt handling code is too picky in deciding whether it should handle an interrupt or not which causes completely unneeded spurious interrupts. Thus make sata_rcar_{ata|serr}_interrupt() *void*; add ATA status register read to sata_rcar_ata_interrupt() to clear an unexpected ATA interrupt -- it doesn't get cleared by writing to the SATAINTSTAT register in the interrupt mode we use. Also, in sata_rcar_ata_interrupt() we should check SATAINTSTAT register only for enabled interrupts and we should clear only those interrupts that we have read as active first time around, because else we have a race and risk clearing an interrupt that can occur between read and write of the SATAINTSTAT register and never registering it... Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: stable@vger.kernel.org
-rw-r--r--drivers/ata/sata_rcar.c23
1 files changed, 11 insertions, 12 deletions
diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
index a8e091aafdd..249c8a289bf 100644
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -619,17 +619,16 @@ static struct ata_port_operations sata_rcar_port_ops = {
.bmdma_status = sata_rcar_bmdma_status,
};
-static int sata_rcar_serr_interrupt(struct ata_port *ap)
+static void sata_rcar_serr_interrupt(struct ata_port *ap)
{
struct sata_rcar_priv *priv = ap->host->private_data;
struct ata_eh_info *ehi = &ap->link.eh_info;
int freeze = 0;
- int handled = 0;
u32 serror;
serror = ioread32(priv->base + SCRSERR_REG);
if (!serror)
- return 0;
+ return;
DPRINTK("SError @host_intr: 0x%x\n", serror);
@@ -642,7 +641,6 @@ static int sata_rcar_serr_interrupt(struct ata_port *ap)
ata_ehi_push_desc(ehi, "%s", "hotplug");
freeze = serror & SERR_COMM_WAKE ? 0 : 1;
- handled = 1;
}
/* freeze or abort */
@@ -650,11 +648,9 @@ static int sata_rcar_serr_interrupt(struct ata_port *ap)
ata_port_freeze(ap);
else
ata_port_abort(ap);
-
- return handled;
}
-static int sata_rcar_ata_interrupt(struct ata_port *ap)
+static void sata_rcar_ata_interrupt(struct ata_port *ap)
{
struct ata_queued_cmd *qc;
int handled = 0;
@@ -663,7 +659,9 @@ static int sata_rcar_ata_interrupt(struct ata_port *ap)
if (qc)
handled |= ata_bmdma_port_intr(ap, qc);
- return handled;
+ /* be sure to clear ATA interrupt */
+ if (!handled)
+ sata_rcar_check_status(ap);
}
static irqreturn_t sata_rcar_interrupt(int irq, void *dev_instance)
@@ -678,20 +676,21 @@ static irqreturn_t sata_rcar_interrupt(int irq, void *dev_instance)
spin_lock_irqsave(&host->lock, flags);
sataintstat = ioread32(priv->base + SATAINTSTAT_REG);
+ sataintstat &= SATA_RCAR_INT_MASK;
if (!sataintstat)
goto done;
/* ack */
- iowrite32(sataintstat & ~SATA_RCAR_INT_MASK,
- priv->base + SATAINTSTAT_REG);
+ iowrite32(~sataintstat & 0x7ff, priv->base + SATAINTSTAT_REG);
ap = host->ports[0];
if (sataintstat & SATAINTSTAT_ATA)
- handled |= sata_rcar_ata_interrupt(ap);
+ sata_rcar_ata_interrupt(ap);
if (sataintstat & SATAINTSTAT_SERR)
- handled |= sata_rcar_serr_interrupt(ap);
+ sata_rcar_serr_interrupt(ap);
+ handled = 1;
done:
spin_unlock_irqrestore(&host->lock, flags);