[RFC patch] genirq threading for ehci, ohci and uhci USB hosts
From: Sven-Thorsten Dietrich
Date: Mon Oct 20 2008 - 21:33:23 EST
On Wed, 2008-10-01 at 23:02 +0000, Thomas Gleixner wrote:
> This patch series implements support for threaded irq handlers for the
> generic IRQ layer.
Subject: genirq threading for ehci, ohci and uhci USB hosts.
This is a functional POC for partitioning of the USB interrupt handlers into
a quickcheck function and a threaded main-handler function.
The quickcheck performs the following actions only:
1. read status and stores.
2. check if the device is asserting, disable device assert
3. wake irq thread or return IRQ_NONE (shared IRQ not this USB)
The handler thread performs all other operations, and is conditionally
invoked via return code from quickcheck.
A function pointer *quickcheck() has been added, as well as a status
cache, which remembers the status reported by the chip. The status must
be passed to the threaded handler, since it is cleared by the quickcheck
function.
Currently, non-reentrancy is assumed, i.e. the chip will not assert another
IRQ until the thread has completed running.
In contrast with that, I have tightened up the locking between the
quickcheck handler and the main thread, this may be overly conservative.
The WARN_ONCE notes when status reported by the chip does not match
cached status, although this is expected. Its to be removed.
Note, that locking is not explicitly used for ohci as it is
in uhci and ehci.
The ieee1394/ohci1394.c is a bit more problematic, since it does not use
struct usb_hcd, and therefore another place for the status cache must be found,
in struct ti_ohci presumably.
I will send a separate patch for ieee1394/ohci1394.c after looking at it more.
The patch increases the code size by 100 lines, but there are some cleanups
that account for maybe a dozen lines, which can be broken-out.
Infrastructure:
This hack in kernel/irq/handle.c needs to be looked at, set_bit failed to work
properly on my AMD x86_64 machine, not further investigated and the code path
is currently not triggered by this patch.
+ //set_bit(IRQF_WARNED_THREADED, &action->flags);
+ action->flags |= IRQF_WARNED_THREADED;
Testing:
I have copied hundreds of gigs over ohci and ehci threads to and from USB disk.
In addition, I have written to USB flash, and mouse, keyboard work.
I have only tested on x86_64 so far, but will start on i386 ASAP.
I encountered some hangs at shutdown, that I attributed to racing, and have
not reproduced it after the locking changes, and when always using the cached
chip status in the threaded handler.
A tarball of all required genirq patches and series against 2.6.27 can
be downloaded:
http://www.thebigcorporation.com/Sven/genirq-usb/
The patch series also applied fine against Linus's git as well as linux-tip
as of Saturday.
Signed-off-by: Sven-Thorsten Dietrich <sven@xxxxxxxxxxxxxxxxxxxxx>
drivers/usb/core/hcd.h | 3 ++
drivers/usb/host/ehci-au1xxx.c | 1
drivers/usb/host/ehci-fsl.c | 1
drivers/usb/host/ehci-hcd.c | 40 +++++++++++++++++++++++---------
drivers/usb/host/ehci-ixp4xx.c | 1
drivers/usb/host/ehci-orion.c | 1
drivers/usb/host/ehci-pci.c | 1
drivers/usb/host/ehci-ppc-of.c | 1
drivers/usb/host/ehci-ps3.c | 1
drivers/usb/host/ohci-at91.c | 1
drivers/usb/host/ohci-au1xxx.c | 1
drivers/usb/host/ohci-ep93xx.c | 1
drivers/usb/host/ohci-hcd.c | 20 ++++++++++++++--
drivers/usb/host/ohci-lh7a404.c | 1
drivers/usb/host/ohci-omap.c | 1
drivers/usb/host/ohci-pci.c | 1
drivers/usb/host/ohci-pnx4008.c | 1
drivers/usb/host/ohci-pnx8550.c | 1
drivers/usb/host/ohci-ppc-of.c | 1
drivers/usb/host/ohci-ppc-soc.c | 1
drivers/usb/host/ohci-ps3.c | 1
drivers/usb/host/ohci-pxa27x.c | 1
drivers/usb/host/ohci-s3c2410.c | 1
drivers/usb/host/ohci-sa1111.c | 1
drivers/usb/host/ohci-sh.c | 1
drivers/usb/host/ohci-sm501.c | 1
drivers/usb/host/ohci-ssb.c | 1
drivers/usb/host/uhci-hcd.c | 23 +++++++++++++++++-
kernel/irq/handle.c | 8 +++---
30 files changed, 134 insertions(+), 34 deletions(-)
--
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 8ab389d..6afd769 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1673,15 +1673,7 @@ EXPORT_SYMBOL_GPL(usb_bus_start_enum);
/*-------------------------------------------------------------------------*/
-/**
- * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
- * @irq: the IRQ being raised
- * @__hcd: pointer to the HCD whose IRQ is being signaled
- *
- * If the controller isn't HALTed, calls the driver's irq handler.
- * Checks whether the controller is now dead.
- */
-irqreturn_t usb_hcd_irq (int irq, void *__hcd)
+irqreturn_t usb_hcd_irq_quickcheck(int irq, void *__hcd)
{
struct usb_hcd *hcd = __hcd;
unsigned long flags;
@@ -1696,20 +1688,44 @@ irqreturn_t usb_hcd_irq (int irq, void *__hcd)
if (unlikely(hcd->state == HC_STATE_HALT ||
!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
rc = IRQ_NONE;
- } else if (hcd->driver->irq(hcd) == IRQ_NONE) {
- rc = IRQ_NONE;
- } else {
+ } else if ((rc = hcd->driver->irq_quickcheck(hcd)) != IRQ_NONE) {
+
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
if (unlikely(hcd->state == HC_STATE_HALT))
usb_hc_died(hcd);
- rc = IRQ_HANDLED;
}
local_irq_restore(flags);
return rc;
}
+/**
+ * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
+ * @irq: the IRQ being raised
+ * @__hcd: pointer to the HCD whose IRQ is being signaled
+ *
+ * If the controller isn't HALTed, calls the driver's irq handler.
+ * Checks whether the controller is now dead.
+ */
+irqreturn_t usb_hcd_irq (int irq, void *__hcd)
+{
+ struct usb_hcd *hcd = __hcd;
+ unsigned long flags;
+ irqreturn_t rc;
+
+ /* Remaining artifact from non-threaded. Is it needed? */
+ local_irq_save(flags);
+
+ rc = hcd->driver->irq(hcd);
+
+ if (unlikely(hcd->state == HC_STATE_HALT))
+ usb_hc_died(hcd);
+
+ local_irq_restore(flags);
+ return rc;
+}
+
/*-------------------------------------------------------------------------*/
/**
@@ -1881,10 +1897,12 @@ int usb_add_hcd(struct usb_hcd *hcd,
snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
hcd->driver->description, hcd->self.busnum);
- if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
- hcd->irq_descr, hcd)) != 0) {
+ retval = request_threaded_irq(irqnum, &usb_hcd_irq,
+ &usb_hcd_irq_quickcheck, irqflags,
+ hcd->irq_descr, hcd);
+ if (retval != 0) {
dev_err(hcd->self.controller,
- "request interrupt %d failed\n", irqnum);
+ "request interrupt %d failed\n", irqnum);
goto err_request_irq;
}
hcd->irq = irqnum;
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index e710ce0..c0b8a12 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -113,6 +113,8 @@ struct usb_hcd {
struct dma_pool *pool [HCD_BUFFER_POOLS];
int state;
+ unsigned short status_cache; /* saved by irq quickcheck */
+
# define __ACTIVE 0x01
# define __SUSPEND 0x04
# define __TRANSIENT 0x80
@@ -164,6 +166,7 @@ struct hc_driver {
size_t hcd_priv_size; /* size of private data */
/* irq handler */
+ irqreturn_t (*irq_quickcheck) (struct usb_hcd *hcd);
irqreturn_t (*irq) (struct usb_hcd *hcd);
int flags;
diff --git a/drivers/usb/host/ehci-au1xxx.c b/drivers/usb/host/ehci-au1xxx.c
index bf69f47..b181815 100644
--- a/drivers/usb/host/ehci-au1xxx.c
+++ b/drivers/usb/host/ehci-au1xxx.c
@@ -77,6 +77,7 @@ static const struct hc_driver ehci_au1xxx_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ehci_irq_quickcheck,
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 01c3da3..32d0b89 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -292,6 +292,7 @@ static const struct hc_driver ehci_fsl_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ehci_irq_quickcheck,
.irq = ehci_irq,
.flags = HCD_USB2,
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 8409e07..1f7cb48 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -640,15 +640,41 @@ static int ehci_run (struct usb_hcd *hcd)
/*-------------------------------------------------------------------------*/
+static irqreturn_t ehci_irq_quickcheck (struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci (hcd);
+ u32 status;
+
+ spin_lock (&ehci->lock);
+
+ status = ehci_readl(ehci, &ehci->regs->status);
+ hcd->status_cache = status;
+
+ if (!status & INTR_MASK) { /* irq sharing? */
+ spin_unlock(&ehci->lock);
+ return IRQ_NONE;
+ }
+
+ /* clear (just) interrupts */
+ ehci_writel(ehci, status, &ehci->regs->status);
+ hcd->status_cache = status;
+ spin_unlock (&ehci->lock);
+
+ return IRQ_WAKE_THREAD;
+}
+
static irqreturn_t ehci_irq (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 status, pcd_status = 0, cmd;
int bh;
+ unsigned long flags;
- spin_lock (&ehci->lock);
+ spin_lock_irqsave(&ehci->lock, flags);
- status = ehci_readl(ehci, &ehci->regs->status);
+ WARN_ONCE((ehci_readl(ehci, &ehci->regs->status) != hcd->status_cache),
+ "Chip status change %X - %X\n", hcd->status_cache, status);
+ status = hcd->status_cache;
/* e.g. cardbus physical eject */
if (status == ~(u32) 0) {
@@ -656,14 +682,6 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
goto dead;
}
- status &= INTR_MASK;
- if (!status) { /* irq sharing? */
- spin_unlock(&ehci->lock);
- return IRQ_NONE;
- }
-
- /* clear (just) interrupts */
- ehci_writel(ehci, status, &ehci->regs->status);
cmd = ehci_readl(ehci, &ehci->regs->command);
bh = 0;
@@ -748,7 +766,7 @@ dead:
if (bh)
ehci_work (ehci);
- spin_unlock (&ehci->lock);
+ spin_unlock_irqrestore(&ehci->lock, flags);
if (pcd_status)
usb_hcd_poll_rh_status(hcd);
return IRQ_HANDLED;
diff --git a/drivers/usb/host/ehci-ixp4xx.c b/drivers/usb/host/ehci-ixp4xx.c
index f9575c4..f2ba793 100644
--- a/drivers/usb/host/ehci-ixp4xx.c
+++ b/drivers/usb/host/ehci-ixp4xx.c
@@ -42,6 +42,7 @@ static const struct hc_driver ixp4xx_ehci_hc_driver = {
.description = hcd_name,
.product_desc = "IXP4XX EHCI Host Controller",
.hcd_priv_size = sizeof(struct ehci_hcd),
+ .irq_quickcheck = ehci_irq_quickcheck,
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
.reset = ixp4xx_ehci_init,
diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index 5416cf9..98104e1 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -131,6 +131,7 @@ static const struct hc_driver ehci_orion_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ehci_irq_quickcheck,
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index c46a58f..5e4cfa0 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -344,6 +344,7 @@ static const struct hc_driver ehci_pci_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ehci_irq_quickcheck,
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
diff --git a/drivers/usb/host/ehci-ppc-of.c b/drivers/usb/host/ehci-ppc-of.c
index b018dee..52e2798 100644
--- a/drivers/usb/host/ehci-ppc-of.c
+++ b/drivers/usb/host/ehci-ppc-of.c
@@ -44,6 +44,7 @@ static const struct hc_driver ehci_ppc_of_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ehci_irq_quickcheck,
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c
index 0eba894..f9fd4fe 100644
--- a/drivers/usb/host/ehci-ps3.c
+++ b/drivers/usb/host/ehci-ps3.c
@@ -56,6 +56,7 @@ static const struct hc_driver ps3_ehci_hc_driver = {
.description = hcd_name,
.product_desc = "PS3 EHCI Host Controller",
.hcd_priv_size = sizeof(struct ehci_hcd),
+ .irq_quickcheck = ehci_irq_quickcheck,
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
.reset = ps3_ehci_hc_reset,
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 4ed228a..0790627 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -233,6 +233,7 @@ static const struct hc_driver ohci_at91_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-au1xxx.c b/drivers/usb/host/ohci-au1xxx.c
index 2ac4e02..1afe6de 100644
--- a/drivers/usb/host/ohci-au1xxx.c
+++ b/drivers/usb/host/ohci-au1xxx.c
@@ -136,6 +136,7 @@ static const struct hc_driver ohci_au1xxx_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-ep93xx.c b/drivers/usb/host/ohci-ep93xx.c
index fb3055f..30b366e 100644
--- a/drivers/usb/host/ohci-ep93xx.c
+++ b/drivers/usb/host/ohci-ep93xx.c
@@ -123,6 +123,7 @@ static struct hc_driver ohci_ep93xx_hc_driver = {
.description = hcd_name,
.product_desc = "EP93xx OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
.start = ohci_ep93xx_start,
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 8990196..9a122ec 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -28,6 +28,7 @@
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
+#include <linux/irqreturn.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/usb.h>
@@ -745,8 +746,7 @@ retry:
/*-------------------------------------------------------------------------*/
/* an interrupt happens */
-
-static irqreturn_t ohci_irq (struct usb_hcd *hcd)
+static irqreturn_t ohci_irq_quickcheck(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
struct ohci_regs __iomem *regs = ohci->regs;
@@ -774,6 +774,22 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd)
if (ints == 0)
return IRQ_NOTMINE;
+ ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
+ hcd->status_cache = ints;
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t ohci_irq (struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ struct ohci_regs __iomem *regs = ohci->regs;
+ int ints;
+
+ WARN_ONCE((ohci_readl(ohci, ®s->intrstatus) != hcd->status_cache),
+ "Chip status change %X - %X\n", hcd->status_cache, ints);
+ ints = hcd->status_cache;
+
if (ints & OHCI_INTR_UE) {
// e.g. due to PCI Master/Target Abort
if (quirk_nec(ohci)) {
diff --git a/drivers/usb/host/ohci-lh7a404.c b/drivers/usb/host/ohci-lh7a404.c
index de42283..3b51be3 100644
--- a/drivers/usb/host/ohci-lh7a404.c
+++ b/drivers/usb/host/ohci-lh7a404.c
@@ -166,6 +166,7 @@ static const struct hc_driver ohci_lh7a404_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
index 95b3ec8..f9c791a 100644
--- a/drivers/usb/host/ohci-omap.c
+++ b/drivers/usb/host/ohci-omap.c
@@ -442,6 +442,7 @@ static const struct hc_driver ohci_omap_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index a9c2ae3..d04f48b 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -426,6 +426,7 @@ static const struct hc_driver ohci_pci_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_MEMORY | HCD_USB11,
diff --git a/drivers/usb/host/ohci-pnx4008.c b/drivers/usb/host/ohci-pnx4008.c
index 658a2a9..ad0c6fe 100644
--- a/drivers/usb/host/ohci-pnx4008.c
+++ b/drivers/usb/host/ohci-pnx4008.c
@@ -249,6 +249,7 @@ static const struct hc_driver ohci_pnx4008_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-pnx8550.c b/drivers/usb/host/ohci-pnx8550.c
index 28467e2..ee18f4a 100644
--- a/drivers/usb/host/ohci-pnx8550.c
+++ b/drivers/usb/host/ohci-pnx8550.c
@@ -175,6 +175,7 @@ static const struct hc_driver ohci_pnx8550_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-ppc-of.c b/drivers/usb/host/ohci-ppc-of.c
index 7ac5326..2fe80ac 100644
--- a/drivers/usb/host/ohci-ppc-of.c
+++ b/drivers/usb/host/ohci-ppc-of.c
@@ -45,6 +45,7 @@ static const struct hc_driver ohci_ppc_of_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-ppc-soc.c b/drivers/usb/host/ohci-ppc-soc.c
index cd3398b..5fd3dee 100644
--- a/drivers/usb/host/ohci-ppc-soc.c
+++ b/drivers/usb/host/ohci-ppc-soc.c
@@ -145,6 +145,7 @@ static const struct hc_driver ohci_ppc_soc_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-ps3.c b/drivers/usb/host/ohci-ps3.c
index 2089d8a..bd7c1a7 100644
--- a/drivers/usb/host/ohci-ps3.c
+++ b/drivers/usb/host/ohci-ps3.c
@@ -56,6 +56,7 @@ static const struct hc_driver ps3_ohci_hc_driver = {
.description = hcd_name,
.product_desc = "PS3 OHCI Host Controller",
.hcd_priv_size = sizeof(struct ohci_hcd),
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_MEMORY | HCD_USB11,
.reset = ps3_ohci_hc_reset,
diff --git a/drivers/usb/host/ohci-pxa27x.c b/drivers/usb/host/ohci-pxa27x.c
index 7f0f35c..148e37b 100644
--- a/drivers/usb/host/ohci-pxa27x.c
+++ b/drivers/usb/host/ohci-pxa27x.c
@@ -271,6 +271,7 @@ static const struct hc_driver ohci_pxa27x_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c
index f46af7a..65a51ed 100644
--- a/drivers/usb/host/ohci-s3c2410.c
+++ b/drivers/usb/host/ohci-s3c2410.c
@@ -439,6 +439,7 @@ static const struct hc_driver ohci_s3c2410_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-sa1111.c b/drivers/usb/host/ohci-sa1111.c
index e4bbe8e..910a313 100644
--- a/drivers/usb/host/ohci-sa1111.c
+++ b/drivers/usb/host/ohci-sa1111.c
@@ -205,6 +205,7 @@ static const struct hc_driver ohci_sa1111_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-sh.c b/drivers/usb/host/ohci-sh.c
index 60f03cc..625bb29 100644
--- a/drivers/usb/host/ohci-sh.c
+++ b/drivers/usb/host/ohci-sh.c
@@ -41,6 +41,7 @@ static const struct hc_driver ohci_sh_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
diff --git a/drivers/usb/host/ohci-sm501.c b/drivers/usb/host/ohci-sm501.c
index cff2363..c1a0b6b 100644
--- a/drivers/usb/host/ohci-sm501.c
+++ b/drivers/usb/host/ohci-sm501.c
@@ -47,6 +47,7 @@ static const struct hc_driver ohci_sm501_hc_driver = {
/*
* generic hardware linkage
*/
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
diff --git a/drivers/usb/host/ohci-ssb.c b/drivers/usb/host/ohci-ssb.c
index 23fd6a8..5b3ab3c 100644
--- a/drivers/usb/host/ohci-ssb.c
+++ b/drivers/usb/host/ohci-ssb.c
@@ -65,6 +65,7 @@ static const struct hc_driver ssb_ohci_hc_driver = {
.product_desc = "SSB OHCI Controller",
.hcd_priv_size = sizeof(struct ssb_ohci_device),
+ .irq_quickcheck = ohci_irq_quickcheck,
.irq = ohci_irq,
.flags = HCD_MEMORY | HCD_USB11,
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 3a7bfe7..4d4481b 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -407,11 +407,12 @@ __acquires(uhci->lock)
mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
}
-static irqreturn_t uhci_irq(struct usb_hcd *hcd)
+static irqreturn_t uhci_irq_quickcheck(struct usb_hcd *hcd)
{
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
unsigned short status;
+ spin_lock(&uhci->lock);
/*
* Read the interrupt status, and write it back to clear the
* interrupt cause. Contrary to the UHCI specification, the
@@ -421,6 +422,25 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd)
if (!(status & ~USBSTS_HCH)) /* shared interrupt, not mine */
return IRQ_NONE;
outw(status, uhci->io_addr + USBSTS); /* Clear it */
+ hcd->status_cache = status;
+ spin_unlock(&uhci->lock);
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t uhci_irq(struct usb_hcd *hcd)
+{
+ struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+ unsigned short status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&uhci->lock, flags);
+
+ WARN_ONCE((inw(uhci->io_addr + USBSTS) != hcd->status_cache),
+ "Chip status change %X - %X\n", hcd->status_cache, status);
+ status = hcd->status_cache;
+
+ spin_unlock_irqrestore(&uhci->lock, flags);
if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
if (status & USBSTS_HSE)
@@ -900,6 +920,7 @@ static const struct hc_driver uhci_driver = {
.hcd_priv_size = sizeof(struct uhci_hcd),
/* Generic hardware linkage */
+ .irq_quickcheck = uhci_irq_quickcheck,
.irq = uhci_irq,
.flags = HCD_USB11,
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index b204455..d8faf88 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -152,14 +152,14 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
}
/*
* Warn once when a quick check handler asked
- * for invoking the threaded (main) handler
- * directly
+ * for invoking the threaded (main) handler directly
*/
WARN(!(action->flags & IRQF_WARNED_THREADED),
"IRQ %d requested to run threaded handler "
"in hard interrupt context\n", irq);
- set_bit(IRQF_WARNED_THREADED, &action->flags);
-
+ //set_bit(IRQF_WARNED_THREADED, &action->flags);
+ action->flags |= IRQF_WARNED_THREADED;
+
case IRQ_WAKE_THREAD:
/*
* In case the thread crashed and was killed
--
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