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authorAlan Stern <stern@rowland.harvard.edu>2011-03-07 11:11:52 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-03-23 13:03:51 -0700
commitca81d7760eb900e6f42b60e52b8a3efc88780e37 (patch)
tree6cfc89ec36270cbadb3d944f95bac63f844ba44a
parenta6b2dd27d8d97c83b7f0c70c8813f96801f85c00 (diff)
downloadlinux-2.6.38-lt-ux500-ca81d7760eb900e6f42b60e52b8a3efc88780e37.tar.gz
USB: move usbcore away from hcd->state
commit 9b37596a2e860404503a3f2a6513db60c296bfdc upstream. The hcd->state variable is a disaster. It's not clearly owned by either usbcore or the host controller drivers, and they both change it from time to time, potentially stepping on each other's toes. It's not protected by any locks. And there's no mechanism to prevent it from going through an invalid transition. This patch (as1451) takes a first step toward fixing these problems. As it turns out, usbcore uses hcd->state for essentially only two things: checking whether the controller's root hub is running and checking whether the controller has died. Therefore the patch adds two new atomic bitflags to the hcd structure, to store these pieces of information. The new flags are used only by usbcore, and a private spinlock prevents invalid combinations (a dead controller's root hub cannot be running). The patch does not change the places where usbcore sets hcd->state, since HCDs may depend on them. Furthermore, there is one place in usb_hcd_irq() where usbcore still must use hcd->state: An HCD's interrupt handler can implicitly indicate that the controller died by setting hcd->state to HC_STATE_HALT. Nevertheless, the new code is a big improvement over the current code. The patch makes one other change. The hcd_bus_suspend() and hcd_bus_resume() routines now check first whether the host controller has died; if it has then they return immediately without calling the HCD's bus_suspend or bus_resume methods. This fixes the major problem reported in Bugzilla #29902: The system fails to suspend after a host controller dies during system resume. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Alex Terekhov <a.terekhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/core/hcd-pci.c13
-rw-r--r--drivers/usb/core/hcd.c55
-rw-r--r--include/linux/usb/hcd.h4
3 files changed, 51 insertions, 21 deletions
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index f71e8e307e0..d37088591d9 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -363,8 +363,7 @@ static int check_root_hub_suspended(struct device *dev)
struct pci_dev *pci_dev = to_pci_dev(dev);
struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
- if (!(hcd->state == HC_STATE_SUSPENDED ||
- hcd->state == HC_STATE_HALT)) {
+ if (HCD_RH_RUNNING(hcd)) {
dev_warn(dev, "Root hub is not suspended\n");
return -EBUSY;
}
@@ -386,7 +385,7 @@ static int suspend_common(struct device *dev, bool do_wakeup)
if (retval)
return retval;
- if (hcd->driver->pci_suspend) {
+ if (hcd->driver->pci_suspend && !HCD_DEAD(hcd)) {
/* Optimization: Don't suspend if a root-hub wakeup is
* pending and it would cause the HCD to wake up anyway.
*/
@@ -427,7 +426,7 @@ static int resume_common(struct device *dev, int event)
struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
int retval;
- if (hcd->state != HC_STATE_SUSPENDED) {
+ if (HCD_RH_RUNNING(hcd)) {
dev_dbg(dev, "can't resume, not suspended!\n");
return 0;
}
@@ -442,7 +441,7 @@ static int resume_common(struct device *dev, int event)
clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
- if (hcd->driver->pci_resume) {
+ if (hcd->driver->pci_resume && !HCD_DEAD(hcd)) {
if (event != PM_EVENT_AUTO_RESUME)
wait_for_companions(pci_dev, hcd);
@@ -475,10 +474,10 @@ static int hcd_pci_suspend_noirq(struct device *dev)
pci_save_state(pci_dev);
- /* If the root hub is HALTed rather than SUSPENDed,
+ /* If the root hub is dead rather than suspended,
* disallow remote wakeup.
*/
- if (hcd->state == HC_STATE_HALT)
+ if (HCD_DEAD(hcd))
device_set_wakeup_enable(dev, 0);
dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index e935f71d7a3..c34a935c7a3 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -983,7 +983,7 @@ static int register_root_hub(struct usb_hcd *hcd)
spin_unlock_irq (&hcd_root_hub_lock);
/* Did the HC die before the root hub was registered? */
- if (hcd->state == HC_STATE_HALT)
+ if (HCD_DEAD(hcd) || hcd->state == HC_STATE_HALT)
usb_hc_died (hcd); /* This time clean up */
}
@@ -1089,13 +1089,10 @@ int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
* Check the host controller's state and add the URB to the
* endpoint's queue.
*/
- switch (hcd->state) {
- case HC_STATE_RUNNING:
- case HC_STATE_RESUMING:
+ if (HCD_RH_RUNNING(hcd)) {
urb->unlinked = 0;
list_add_tail(&urb->urb_list, &urb->ep->urb_list);
- break;
- default:
+ } else {
rc = -ESHUTDOWN;
goto done;
}
@@ -1913,7 +1910,7 @@ int usb_hcd_get_frame_number (struct usb_device *udev)
{
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
- if (!HC_IS_RUNNING (hcd->state))
+ if (!HCD_RH_RUNNING(hcd))
return -ESHUTDOWN;
return hcd->driver->get_frame_number (hcd);
}
@@ -1930,9 +1927,15 @@ int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
dev_dbg(&rhdev->dev, "bus %s%s\n",
(msg.event & PM_EVENT_AUTO ? "auto-" : ""), "suspend");
+ if (HCD_DEAD(hcd)) {
+ dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
+ return 0;
+ }
+
if (!hcd->driver->bus_suspend) {
status = -ENOENT;
} else {
+ clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
hcd->state = HC_STATE_QUIESCING;
status = hcd->driver->bus_suspend(hcd);
}
@@ -1940,7 +1943,12 @@ int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
hcd->state = HC_STATE_SUSPENDED;
} else {
- hcd->state = old_state;
+ spin_lock_irq(&hcd_root_hub_lock);
+ if (!HCD_DEAD(hcd)) {
+ set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ hcd->state = old_state;
+ }
+ spin_unlock_irq(&hcd_root_hub_lock);
dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
"suspend", status);
}
@@ -1955,9 +1963,13 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
dev_dbg(&rhdev->dev, "usb %s%s\n",
(msg.event & PM_EVENT_AUTO ? "auto-" : ""), "resume");
+ if (HCD_DEAD(hcd)) {
+ dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
+ return 0;
+ }
if (!hcd->driver->bus_resume)
return -ENOENT;
- if (hcd->state == HC_STATE_RUNNING)
+ if (HCD_RH_RUNNING(hcd))
return 0;
hcd->state = HC_STATE_RESUMING;
@@ -1966,10 +1978,15 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
if (status == 0) {
/* TRSMRCY = 10 msec */
msleep(10);
- usb_set_device_state(rhdev, rhdev->actconfig
- ? USB_STATE_CONFIGURED
- : USB_STATE_ADDRESS);
- hcd->state = HC_STATE_RUNNING;
+ spin_lock_irq(&hcd_root_hub_lock);
+ if (!HCD_DEAD(hcd)) {
+ usb_set_device_state(rhdev, rhdev->actconfig
+ ? USB_STATE_CONFIGURED
+ : USB_STATE_ADDRESS);
+ set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ hcd->state = HC_STATE_RUNNING;
+ }
+ spin_unlock_irq(&hcd_root_hub_lock);
} else {
hcd->state = old_state;
dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
@@ -2080,7 +2097,7 @@ irqreturn_t usb_hcd_irq (int irq, void *__hcd)
*/
local_irq_save(flags);
- if (unlikely(hcd->state == HC_STATE_HALT || !HCD_HW_ACCESSIBLE(hcd))) {
+ if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd))) {
rc = IRQ_NONE;
} else if (hcd->driver->irq(hcd) == IRQ_NONE) {
rc = IRQ_NONE;
@@ -2114,6 +2131,8 @@ void usb_hc_died (struct usb_hcd *hcd)
dev_err (hcd->self.controller, "HC died; cleaning up\n");
spin_lock_irqsave (&hcd_root_hub_lock, flags);
+ clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+ set_bit(HCD_FLAG_DEAD, &hcd->flags);
if (hcd->rh_registered) {
clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
@@ -2256,6 +2275,12 @@ int usb_add_hcd(struct usb_hcd *hcd,
*/
device_init_wakeup(&rhdev->dev, 1);
+ /* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
+ * registered. But since the controller can die at any time,
+ * let's initialize the flag before touching the hardware.
+ */
+ set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
+
/* "reset" is misnamed; its role is now one-time init. the controller
* should already have been reset (and boot firmware kicked off etc).
*/
@@ -2323,6 +2348,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
return retval;
error_create_attr_group:
+ clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
if (HC_IS_RUNNING(hcd->state))
hcd->state = HC_STATE_QUIESCING;
spin_lock_irq(&hcd_root_hub_lock);
@@ -2375,6 +2401,7 @@ void usb_remove_hcd(struct usb_hcd *hcd)
usb_get_dev(rhdev);
sysfs_remove_group(&rhdev->dev.kobj, &usb_bus_attr_group);
+ clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
if (HC_IS_RUNNING (hcd->state))
hcd->state = HC_STATE_QUIESCING;
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index a854fe89484..f21f5996fa6 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -99,6 +99,8 @@ struct usb_hcd {
#define HCD_FLAG_POLL_RH 2 /* poll for rh status? */
#define HCD_FLAG_POLL_PENDING 3 /* status has changed? */
#define HCD_FLAG_WAKEUP_PENDING 4 /* root hub is resuming? */
+#define HCD_FLAG_RH_RUNNING 5 /* root hub is running? */
+#define HCD_FLAG_DEAD 6 /* controller has died? */
/* The flags can be tested using these macros; they are likely to
* be slightly faster than test_bit().
@@ -108,6 +110,8 @@ struct usb_hcd {
#define HCD_POLL_RH(hcd) ((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
#define HCD_POLL_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
#define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))
+#define HCD_RH_RUNNING(hcd) ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
+#define HCD_DEAD(hcd) ((hcd)->flags & (1U << HCD_FLAG_DEAD))
/* Flags that get set only during HCD registration or removal. */
unsigned rh_registered:1;/* is root hub registered? */