Messages in this thread Patch in this message | | | From | Willy Tarreau <> | Date | Wed, 22 Aug 2007 11:38:58 +0200 | Subject | [2.6.20.17 review 14/58] USB: fix warning caused by autosuspend counter going negative |
| |
This patch (as937) fixes a minor bug in the autosuspend usage-counting code. Each hub's usage counter keeps track of the number of unsuspended children. However the current driver increments the counter after registering a new child, by which time the child may already have been suspended and caused the counter to go negative. The obvious solution is to increment the counter before registering the child.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Willy Tarreau <w@1wt.eu> --- drivers/usb/core/hub.c | 10 ++++++---- 1 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 8ddeed3..d5890d5 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1356,6 +1356,10 @@ static int __usb_new_device(void *void_data) } #endif + /* Increment the parent's count of unsuspended children */ + if (udev->parent) + usb_autoresume_device(udev->parent); + /* Register the device. The device driver is responsible * for adding the device files to usbfs and sysfs and for * configuring the device. @@ -1363,13 +1367,11 @@ static int __usb_new_device(void *void_data) err = device_add (&udev->dev); if (err) { dev_err(&udev->dev, "can't device_add, error %d ", err); + if (udev->parent) + usb_autosuspend_device(udev->parent); goto fail; } - /* Increment the parent's count of unsuspended children */ - if (udev->parent) - usb_autoresume_device(udev->parent); - exit: module_put(THIS_MODULE); return err; -- 1.5.2.5 -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |