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Message-ID: <20100323134226.GA14752@havoc.gtf.org>
Date: Tue, 23 Mar 2010 09:42:26 -0400
From: Jeff Garzik <jeff@...zik.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: [git patches] libata fixes
This push includes a fix for the ata_piix timeouts people have been
seeing... it has seen several successful test reports, and is ready for
wider testing in 2.6.34-rc.
Please pull from 'upstream-linus' branch of
master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev.git upstream-linus
to receive the following updates:
drivers/ata/libata-sff.c | 43 ++++++++++++++++++++++++++++++++++++-------
drivers/ata/pata_via.c | 1 +
2 files changed, 37 insertions(+), 7 deletions(-)
JosephChan@....com.tw (1):
pata_via: Add VIA VX900 support
Tejun Heo (1):
libata-sff: fix spurious IRQ handling
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 561dec2..2774772 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -1667,6 +1667,7 @@ unsigned int ata_sff_host_intr(struct ata_port *ap,
{
struct ata_eh_info *ehi = &ap->link.eh_info;
u8 status, host_stat = 0;
+ bool bmdma_stopped = false;
VPRINTK("ata%u: protocol %d task_state %d\n",
ap->print_id, qc->tf.protocol, ap->hsm_task_state);
@@ -1699,6 +1700,7 @@ unsigned int ata_sff_host_intr(struct ata_port *ap,
/* before we do anything else, clear DMA-Start bit */
ap->ops->bmdma_stop(qc);
+ bmdma_stopped = true;
if (unlikely(host_stat & ATA_DMA_ERR)) {
/* error when transfering data to/from memory */
@@ -1716,8 +1718,14 @@ unsigned int ata_sff_host_intr(struct ata_port *ap,
/* check main status, clearing INTRQ if needed */
status = ata_sff_irq_status(ap);
- if (status & ATA_BUSY)
- goto idle_irq;
+ if (status & ATA_BUSY) {
+ if (bmdma_stopped) {
+ /* BMDMA engine is already stopped, we're screwed */
+ qc->err_mask |= AC_ERR_HSM;
+ ap->hsm_task_state = HSM_ST_ERR;
+ } else
+ goto idle_irq;
+ }
/* ack bmdma irq events */
ap->ops->sff_irq_clear(ap);
@@ -1762,13 +1770,16 @@ EXPORT_SYMBOL_GPL(ata_sff_host_intr);
irqreturn_t ata_sff_interrupt(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
+ bool retried = false;
unsigned int i;
- unsigned int handled = 0, polling = 0;
+ unsigned int handled, idle, polling;
unsigned long flags;
/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
spin_lock_irqsave(&host->lock, flags);
+retry:
+ handled = idle = polling = 0;
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
struct ata_queued_cmd *qc;
@@ -1782,7 +1793,8 @@ irqreturn_t ata_sff_interrupt(int irq, void *dev_instance)
handled |= ata_sff_host_intr(ap, qc);
else
polling |= 1 << i;
- }
+ } else
+ idle |= 1 << i;
}
/*
@@ -1790,7 +1802,9 @@ irqreturn_t ata_sff_interrupt(int irq, void *dev_instance)
* asserting IRQ line, nobody cared will ensue. Check IRQ
* pending status if available and clear spurious IRQ.
*/
- if (!handled) {
+ if (!handled && !retried) {
+ bool retry = false;
+
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
@@ -1805,8 +1819,23 @@ irqreturn_t ata_sff_interrupt(int irq, void *dev_instance)
ata_port_printk(ap, KERN_INFO,
"clearing spurious IRQ\n");
- ap->ops->sff_check_status(ap);
- ap->ops->sff_irq_clear(ap);
+ if (idle & (1 << i)) {
+ ap->ops->sff_check_status(ap);
+ ap->ops->sff_irq_clear(ap);
+ } else {
+ /* clear INTRQ and check if BUSY cleared */
+ if (!(ap->ops->sff_check_status(ap) & ATA_BUSY))
+ retry |= true;
+ /*
+ * With command in flight, we can't do
+ * sff_irq_clear() w/o racing with completion.
+ */
+ }
+ }
+
+ if (retry) {
+ retried = true;
+ goto retry;
}
}
diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index 3059ec0..95d39c3 100644
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -677,6 +677,7 @@ static const struct pci_device_id via[] = {
{ PCI_VDEVICE(VIA, 0x3164), },
{ PCI_VDEVICE(VIA, 0x5324), },
{ PCI_VDEVICE(VIA, 0xC409), VIA_IDFLAG_SINGLE },
+ { PCI_VDEVICE(VIA, 0x9001), VIA_IDFLAG_SINGLE },
{ },
};
--
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