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USB: documentation update for the pre_reset method

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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>
This commit is contained in:
Alan Stern
2011-04-28 10:45:24 -04:00
committed by Greg Kroah-Hartman
parent 15b2f3204a
commit 6498d9db6d
2 changed files with 9 additions and 5 deletions
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6
include/linux/usb.h
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@@ -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.