linux-kernel - Re: [PATCH] BugFix in XHCI controller driver for scatter gather DMA

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Message-ID: <1450702224.17967.18.camel@suse.de>
Date:	Mon, 21 Dec 2015 13:50:24 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	Vikas Bansal <vikas.bansal@...sung.com>
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, sumit.batra@...sung.com
Subject: Re: [PATCH] BugFix in XHCI controller driver for scatter gather DMA

On Mon, 2015-12-21 at 17:34 +0530, Vikas Bansal wrote:
> Pre-Condition
> At the time of reset resume of a USB device, both self and bus powered devices might go to a low power state or power off state depending on the acceptable suspend time power of the system.    
> In case the device experiences a power glitch or completely powers off during suspend-resume, the device will lose its internal state and hence it'll again need a set interface from class driver on reset resume operation.
> 
> Issue 
> So far our experiments were based on a USB gadget working on cdc_eem protocol. 
> We have seen that device is unable to continue the packet transfer on bulk endpoints after the reset resume operation.
> 
> Solution
> We have added a .reset_resume function for cdc_eem protocol which sends a set interface command on the Control endpoint. And calls the existing usbnet_resume thereafte

Hi,

something is wrong with your subject line. Could you fix
that and resend?

	Regards
		Oliver


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