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path: root/drivers/usb/core
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Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/devio.c2
-rw-r--r--drivers/usb/core/file.c3
-rw-r--r--drivers/usb/core/hcd.c9
-rw-r--r--drivers/usb/core/hcd.h2
-rw-r--r--drivers/usb/core/hub.c9
5 files changed, 25 insertions, 0 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index de17738f3acb..9218cca21043 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -565,6 +565,7 @@ static int usbdev_open(struct inode *inode, struct file *file)
struct dev_state *ps;
int ret;
+ lock_kernel();
/* Protect against simultaneous removal or release */
mutex_lock(&usbfs_mutex);
@@ -611,6 +612,7 @@ static int usbdev_open(struct inode *inode, struct file *file)
if (ret)
kfree(ps);
mutex_unlock(&usbfs_mutex);
+ unlock_kernel();
return ret;
}
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c
index 8133c99c6c5c..c6a95395e52a 100644
--- a/drivers/usb/core/file.c
+++ b/drivers/usb/core/file.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/rwsem.h>
+#include <linux/smp_lock.h>
#include <linux/usb.h>
#include "usb.h"
@@ -33,6 +34,7 @@ static int usb_open(struct inode * inode, struct file * file)
int err = -ENODEV;
const struct file_operations *old_fops, *new_fops = NULL;
+ lock_kernel();
down_read(&minor_rwsem);
c = usb_minors[minor];
@@ -51,6 +53,7 @@ static int usb_open(struct inode * inode, struct file * file)
fops_put(old_fops);
done:
up_read(&minor_rwsem);
+ unlock_kernel();
return err;
}
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 7158dbb6e4b4..42a436478b78 100644
--- 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 a0bf5df6cb6f..b9de1569b39e 100644
--- 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 512d2d57d41e..4cfe32a16c37 100644
--- 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;