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| author | Alan Stern <stern@rowland.harvard.edu> | 2011-04-28 10:45:24 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-29 17:24:29 -0700 |
| commit | 6498d9db6d2dad4cf5deb2dd09e0816904f41ca5 (patch) | |
| tree | 68ebcb03c7d9fc1caf9205d96943ce46d0a08c4c /include/linux/usb.h | |
| parent | 15b2f3204a5c878c32939094775fb7349f707263 (diff) | |
| download | lwn-6498d9db6d2dad4cf5deb2dd09e0816904f41ca5.tar.gz lwn-6498d9db6d2dad4cf5deb2dd09e0816904f41ca5.zip | |
USB: documentation update for the pre_reset method
This patch (as1459) updates the documentation for the pre_reset method
in struct usb_driver. When a driver is notified of an impending
reset, it must cancel all outstanding I/O and not start any new I/O
until it has been notified that the reset is complete.
As far as I know, most existing drivers that implement pre_reset do
this now. The major exceptions appear to be the SpeedTouch and
CDC-WDM drivers.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/usb.h')
| -rw-r--r-- | include/linux/usb.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index 65f78ca5d88e..73c7df489607 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -806,8 +806,10 @@ struct usbdrv_wrap { * @resume: Called when the device is being resumed by the system. * @reset_resume: Called when the suspended device has been reset instead * of being resumed. - * @pre_reset: Called by usb_reset_device() when the device - * is about to be reset. + * @pre_reset: Called by usb_reset_device() when the device is about to be + * reset. This routine must not return until the driver has no active + * URBs for the device, and no more URBs may be submitted until the + * post_reset method is called. * @post_reset: Called by usb_reset_device() after the device * has been reset * @id_table: USB drivers use ID table to support hotplugging. |