linux-kernel - Re: Delivery Status Notification (Failure)

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Message-ID: <CAOAoqGs_391XuB4apV+BQOXxv24=z=9qa6Muh-Ry-0PecqrUDQ@mail.gmail.com>
Date:	Thu, 6 Mar 2014 10:33:17 +0530
From:	Jagdish Gedia <jvgediya@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: Delivery Status Notification (Failure)

Hi Alan,

Thanks for you informative reply.
I will try your suggestion. yes, i will not get more than one wakeup per second.

I have tried below things.
My usb device is using the cdc-acm.c driver.

inside cdc-acm.c file,

static struct usb_device *usb_device;

static int acm_probe(........, ....)
{
    usb_device = interface_to_usbdev(intf);
    ..........
}

inside interrupt handler

static irqhandle_t int_handler(..., ..)
{
   usb_lock_device(usb_device);
   usb_remote_wakeup(usb_device);
   usb_unlock_device(usb_device);
   return IRQ_HANDLED;
}

but these things are not working. kernel is crashing when interrupt occurs.

I have some other doubt also.

1. If usb is runtime suspended and if global suspend happens , do i
need to do anything special to wakeup the usb device?

2. How can i address particularly my usb device. right now, i am using
usb_device = interface_to_usbdev(intf) to get pointer to my usb device
inside probe function, but probe function is getting called for every
interface of the device. Is there any other way through which i can
get the pointer to my usb device like i can traverse all the available
usb device and on basis of vendor and product id i can address my usb
device or by any other way?

thanks,
jagdish gediya
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