Revert "USB: don't explicitly reenable root-hub status interrupts"

This reverts commit e872154921a6b5256a3c412dd69158ac0b135176.

Andrey Borzenkov reports that it resulted in a totally hung machine for
him when loading the OHCI driver.  Extensive netconsole capture with
SysRq output shows that modprobe gets stuck in ohci_hub_status_data()
when probing and enabling the OHCI controller, see for example

	http://lkml.org/lkml/2008/7/5/236

for an analysis.

The problem appears to be an interrupt flood triggered by the commit
that gets reverted, and Andrey confirmed that the revert makes things
work for him again.

Reported-and-tested-by: Andrey Borzenkov <arvidjaar@mail.ru>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <david-b@pacbell.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 7158dbb6e4b4d74863fa4d4bb78ad94d0fbcd8ec..42a436478b78bba99c05a9cf609ea89e4e11adfe 100644 (file)
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -924,6 +924,15 @@ static int register_root_hub(struct usb_hcd *hcd)
        return retval;
 }
 
+void usb_enable_root_hub_irq (struct usb_bus *bus)
+{
+       struct usb_hcd *hcd;
+
+       hcd = container_of (bus, struct usb_hcd, self);
+       if (hcd->driver->hub_irq_enable && hcd->state != HC_STATE_HALT)
+               hcd->driver->hub_irq_enable (hcd);
+}
+
 
 /*-------------------------------------------------------------------------*/
 

diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index a0bf5df6cb6fa3eb77636bd32f49c702822794ab..b9de1569b39e792f8de8301b5b3c8b27782100ee 100644 (file)
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -210,6 +210,8 @@ struct hc_driver {
        int     (*bus_suspend)(struct usb_hcd *);
        int     (*bus_resume)(struct usb_hcd *);
        int     (*start_port_reset)(struct usb_hcd *, unsigned port_num);
+       void    (*hub_irq_enable)(struct usb_hcd *);
+               /* Needed only if port-change IRQs are level-triggered */
 
                /* force handover of high-speed port to full-speed companion */
        void    (*relinquish_port)(struct usb_hcd *, int);

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 512d2d57d41e5e15761bb36cc8c2ee87727acd41..4cfe32a16c37fb689e8bab4796b6918a36728382 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2073,6 +2073,8 @@ int usb_port_resume(struct usb_device *udev)
        }
 
        clear_bit(port1, hub->busy_bits);
+       if (!hub->hdev->parent && !hub->busy_bits[0])
+               usb_enable_root_hub_irq(hub->hdev->bus);
 
        if (status == 0)
                status = finish_port_resume(udev);
@@ -3002,6 +3004,11 @@ static void hub_events(void)
 
                hub->activating = 0;
 
+               /* If this is a root hub, tell the HCD it's okay to
+                * re-enable port-change interrupts now. */
+               if (!hdev->parent && !hub->busy_bits[0])
+                       usb_enable_root_hub_irq(hdev->bus);
+
 loop_autopm:
                /* Allow autosuspend if we're not going to run again */
                if (list_empty(&hub->event_list))
@@ -3227,6 +3234,8 @@ int usb_reset_device(struct usb_device *udev)
                        break;
        }
        clear_bit(port1, parent_hub->busy_bits);
+       if (!parent_hdev->parent && !parent_hub->busy_bits[0])
+               usb_enable_root_hub_irq(parent_hdev->bus);
 
        if (ret < 0)
                goto re_enumerate;

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index c96db1153dcf6d595d2e42fc3bc3c18899f7b187..e534f9de0f05f9bbfc20c4f9938cb29c66a31f7a 100644 (file)
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -261,6 +261,7 @@ static const struct hc_driver ohci_at91_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-au1xxx.c b/drivers/usb/host/ohci-au1xxx.c
index 1b9abdba920b9d18a8a53723a8eabc58342eaf0d..f90fe0c7373f046d7677d48350e177731daef514 100644 (file)
--- a/drivers/usb/host/ohci-au1xxx.c
+++ b/drivers/usb/host/ohci-au1xxx.c
@@ -288,6 +288,7 @@ static const struct hc_driver ohci_au1xxx_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-ep93xx.c b/drivers/usb/host/ohci-ep93xx.c
index 06aadfb0ec29a4683830a1d47191174e3f99b500..5adaf36e47d05627dd1d9a884895ceaa28608aef 100644 (file)
--- a/drivers/usb/host/ohci-ep93xx.c
+++ b/drivers/usb/host/ohci-ep93xx.c
@@ -135,6 +135,7 @@ static struct hc_driver ohci_ep93xx_hc_driver = {
        .get_frame_number       = ohci_get_frame,
        .hub_status_data        = ohci_hub_status_data,
        .hub_control            = ohci_hub_control,
+       .hub_irq_enable         = ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend            = ohci_bus_suspend,
        .bus_resume             = ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index 79a78029f896869892fa2696bd8f1764cc79f9e7..b56739221d11f27d6d6e1b8d04c833fe56bdbd6c 100644 (file)
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -36,6 +36,18 @@
 
 /*-------------------------------------------------------------------------*/
 
+/* hcd->hub_irq_enable() */
+static void ohci_rhsc_enable (struct usb_hcd *hcd)
+{
+       struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
+
+       spin_lock_irq(&ohci->lock);
+       if (!ohci->autostop)
+               del_timer(&hcd->rh_timer);      /* Prevent next poll */
+       ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
+       spin_unlock_irq(&ohci->lock);
+}
+
 #define OHCI_SCHED_ENABLES \
        (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
 
@@ -362,28 +374,18 @@ static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
                int any_connected)
 {
        int     poll_rh = 1;
-       int     rhsc;
 
-       rhsc = ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC;
        switch (ohci->hc_control & OHCI_CTRL_HCFS) {
 
        case OHCI_USB_OPER:
-               /* If no status changes are pending, enable status-change
-                * interrupts.
-                */
-               if (!rhsc && !changed) {
-                       rhsc = OHCI_INTR_RHSC;
-                       ohci_writel(ohci, rhsc, &ohci->regs->intrenable);
-               }
-
-               /* Keep on polling until we know a device is connected
-                * and RHSC is enabled, or until we autostop.
-                */
+               /* keep on polling until we know a device is connected
+                * and RHSC is enabled */
                if (!ohci->autostop) {
                        if (any_connected ||
                                        !device_may_wakeup(&ohci_to_hcd(ohci)
                                                ->self.root_hub->dev)) {
-                               if (rhsc)
+                               if (ohci_readl(ohci, &ohci->regs->intrenable) &
+                                               OHCI_INTR_RHSC)
                                        poll_rh = 0;
                        } else {
                                ohci->autostop = 1;
@@ -396,13 +398,12 @@ static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
                                ohci->autostop = 0;
                                ohci->next_statechange = jiffies +
                                                STATECHANGE_DELAY;
-                       } else if (rhsc && time_after_eq(jiffies,
+                       } else if (time_after_eq(jiffies,
                                                ohci->next_statechange)
                                        && !ohci->ed_rm_list
                                        && !(ohci->hc_control &
                                                OHCI_SCHED_ENABLES)) {
                                ohci_rh_suspend(ohci, 1);
-                               poll_rh = 0;
                        }
                }
                break;
@@ -416,12 +417,6 @@ static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
                        else
                                usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
                } else {
-                       if (!rhsc && (ohci->autostop ||
-                                       ohci_to_hcd(ohci)->self.root_hub->
-                                               do_remote_wakeup))
-                               ohci_writel(ohci, OHCI_INTR_RHSC,
-                                               &ohci->regs->intrenable);
-
                        /* everything is idle, no need for polling */
                        poll_rh = 0;
                }
@@ -443,16 +438,12 @@ static inline int ohci_rh_resume(struct ohci_hcd *ohci)
 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
                int any_connected)
 {
-       /* If RHSC is enabled, don't poll */
-       if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
-               return 0;
+       int     poll_rh = 1;
 
-       /* If no status changes are pending, enable status-change interrupts */
-       if (!changed) {
-               ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
-               return 0;
-       }
-       return 1;
+       /* keep on polling until RHSC is enabled */
+       if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
+               poll_rh = 0;
+       return poll_rh;
 }
 
 #endif /* CONFIG_PM */

diff --git a/drivers/usb/host/ohci-lh7a404.c b/drivers/usb/host/ohci-lh7a404.c
index 96d14fa1d8331b7ee2a587d9138246b99e4bceec..13c12ed22252cc90c1ace3319410819a5e111937 100644 (file)
--- a/drivers/usb/host/ohci-lh7a404.c
+++ b/drivers/usb/host/ohci-lh7a404.c
@@ -193,6 +193,7 @@ static const struct hc_driver ohci_lh7a404_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
index 6859fb5f1d6f6a5d2f9dd29b0c3d063697c15233..3a7c24c03671199680a435cd93370b415bcfa52c 100644 (file)
--- a/drivers/usb/host/ohci-omap.c
+++ b/drivers/usb/host/ohci-omap.c
@@ -466,6 +466,7 @@ static const struct hc_driver ohci_omap_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index 3bf175d95a2303b17d80a3561fc38a727ce13c84..4696cc912e16203540a5185568a27e02bb7c15e2 100644 (file)
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -327,6 +327,7 @@ static const struct hc_driver ohci_pci_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-pnx4008.c b/drivers/usb/host/ohci-pnx4008.c
index 664f07ee87320e2a568c727d95bbf82b8d446894..28b458f20cc3013749503821119e5e741e58a85f 100644 (file)
--- a/drivers/usb/host/ohci-pnx4008.c
+++ b/drivers/usb/host/ohci-pnx4008.c
@@ -280,6 +280,7 @@ static const struct hc_driver ohci_pnx4008_hc_driver = {
         */
        .hub_status_data = ohci_hub_status_data,
        .hub_control = ohci_hub_control,
+       .hub_irq_enable = ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend = ohci_bus_suspend,
        .bus_resume = ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-pnx8550.c b/drivers/usb/host/ohci-pnx8550.c
index 28467e288a93d54607c7cb244e1e904dc6136395..605d59cba28e79d46bbbb3215cfc9ccd1b6f6a5b 100644 (file)
--- a/drivers/usb/host/ohci-pnx8550.c
+++ b/drivers/usb/host/ohci-pnx8550.c
@@ -201,6 +201,7 @@ static const struct hc_driver ohci_pnx8550_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-ppc-of.c b/drivers/usb/host/ohci-ppc-of.c
index 50e55db13636ece797f64ae65e1a01a58800fabe..a6725279122315bf7566b255164d29c7f8130bbd 100644 (file)
--- a/drivers/usb/host/ohci-ppc-of.c
+++ b/drivers/usb/host/ohci-ppc-of.c
@@ -72,6 +72,7 @@ static const struct hc_driver ohci_ppc_of_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-ppc-soc.c b/drivers/usb/host/ohci-ppc-soc.c
index cd3398b675b2dea8c2402fd2178cee58c23a52e4..523c30125577d39a8c24287ce30ae2b2532929e2 100644 (file)
--- a/drivers/usb/host/ohci-ppc-soc.c
+++ b/drivers/usb/host/ohci-ppc-soc.c
@@ -172,6 +172,7 @@ static const struct hc_driver ohci_ppc_soc_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-ps3.c b/drivers/usb/host/ohci-ps3.c
index bfdeb0d22d050576755f6d1054d9d4b561bb7e3a..c1935ae537f80a90779d6eaea502dd4d02ee267d 100644 (file)
--- a/drivers/usb/host/ohci-ps3.c
+++ b/drivers/usb/host/ohci-ps3.c
@@ -68,6 +68,7 @@ static const struct hc_driver ps3_ohci_hc_driver = {
        .get_frame_number       = ohci_get_frame,
        .hub_status_data        = ohci_hub_status_data,
        .hub_control            = ohci_hub_control,
+       .hub_irq_enable         = ohci_rhsc_enable,
        .start_port_reset       = ohci_start_port_reset,
 #if defined(CONFIG_PM)
        .bus_suspend            = ohci_bus_suspend,

diff --git a/drivers/usb/host/ohci-pxa27x.c b/drivers/usb/host/ohci-pxa27x.c
index 70b0d4b459e753bf13ed622eb32fd7b458c9d38c..d4ee27d92be8fd69874f50b1e16785257a1066c1 100644 (file)
--- a/drivers/usb/host/ohci-pxa27x.c
+++ b/drivers/usb/host/ohci-pxa27x.c
@@ -298,6 +298,7 @@ static const struct hc_driver ohci_pxa27x_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef  CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c
index a73d2ff322e28d862184ad83188da0302386f61c..ead4772f0f277c0f1447636e682392612ca65aa3 100644 (file)
--- a/drivers/usb/host/ohci-s3c2410.c
+++ b/drivers/usb/host/ohci-s3c2410.c
@@ -466,6 +466,7 @@ static const struct hc_driver ohci_s3c2410_hc_driver = {
         */
        .hub_status_data =      ohci_s3c2410_hub_status_data,
        .hub_control =          ohci_s3c2410_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-sa1111.c b/drivers/usb/host/ohci-sa1111.c
index 99438c65981b4f8cd98e87066092c2ea1b9251b3..0f48f2d992263f199ad889e31f8e0f3bf0c4f48d 100644 (file)
--- a/drivers/usb/host/ohci-sa1111.c
+++ b/drivers/usb/host/ohci-sa1111.c
@@ -231,6 +231,7 @@ static const struct hc_driver ohci_sa1111_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-sh.c b/drivers/usb/host/ohci-sh.c
index 60f03cc7ec4f20a4f80d228b59faebe715ae1148..e7ee607278fece8b92570beb5b839e74ca8aa2db 100644 (file)
--- a/drivers/usb/host/ohci-sh.c
+++ b/drivers/usb/host/ohci-sh.c
@@ -68,6 +68,7 @@ static const struct hc_driver ohci_sh_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-sm501.c b/drivers/usb/host/ohci-sm501.c
index e899a77dfb8340ae69e3502dcc8c5c2482a93a70..e610698c6b60ca55eadf234599f3a3b254e5309b 100644 (file)
--- a/drivers/usb/host/ohci-sm501.c
+++ b/drivers/usb/host/ohci-sm501.c
@@ -75,6 +75,7 @@ static const struct hc_driver ohci_sm501_hc_driver = {
         */
        .hub_status_data =      ohci_hub_status_data,
        .hub_control =          ohci_hub_control,
+       .hub_irq_enable =       ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend =          ohci_bus_suspend,
        .bus_resume =           ohci_bus_resume,

diff --git a/drivers/usb/host/ohci-ssb.c b/drivers/usb/host/ohci-ssb.c
index c4265caec78023993e62607c5be548560d34fbf4..7275186db31556baf8278ec300da9d0d8600a98f 100644 (file)
--- a/drivers/usb/host/ohci-ssb.c
+++ b/drivers/usb/host/ohci-ssb.c
@@ -81,6 +81,7 @@ static const struct hc_driver ssb_ohci_hc_driver = {
 
        .hub_status_data        = ohci_hub_status_data,
        .hub_control            = ohci_hub_control,
+       .hub_irq_enable         = ohci_rhsc_enable,
 #ifdef CONFIG_PM
        .bus_suspend            = ohci_bus_suspend,
        .bus_resume             = ohci_bus_resume,

diff --git a/drivers/usb/host/u132-hcd.c b/drivers/usb/host/u132-hcd.c
index f29307405bb36aa45ef4a764f9d483d99dfeef6e..9b6323f768b242523495d352134f5533c423566d 100644 (file)
--- a/drivers/usb/host/u132-hcd.c
+++ b/drivers/usb/host/u132-hcd.c
@@ -2934,6 +2934,16 @@ static int u132_start_port_reset(struct usb_hcd *hcd, unsigned port_num)
                return 0;
 }
 
+static void u132_hub_irq_enable(struct usb_hcd *hcd)
+{
+       struct u132 *u132 = hcd_to_u132(hcd);
+       if (u132->going > 1) {
+               dev_err(&u132->platform_dev->dev, "device has been removed %d\n"
+                       , u132->going);
+       } else if (u132->going > 0)
+               dev_err(&u132->platform_dev->dev, "device is being removed\n");
+}
+
 
 #ifdef CONFIG_PM
 static int u132_bus_suspend(struct usb_hcd *hcd)
@@ -2985,6 +2995,7 @@ static struct hc_driver u132_hc_driver = {
        .bus_suspend = u132_bus_suspend,
        .bus_resume = u132_bus_resume,
        .start_port_reset = u132_start_port_reset,
+       .hub_irq_enable = u132_hub_irq_enable,
 };
 
 /*