linux-kernel - Re: [PATCH] usb: echi-hcd: Add register access check in shutdown

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Message-ID: <573CAD1A.4090805@linaro.org>
Date:	Wed, 18 May 2016 18:57:46 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	andy.gross@...aro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] usb: echi-hcd: Add register access check in shutdown

On 18/05/16 15:56, Alan Stern wrote:
> This doesn't seem like the right place.  What you really should do is
> skip calling ehci_silence_controller() if the hardware isn't
> accessible.  That's where the hardware gets touched, not in
> ehci_shutdown().

Just tried this suggestion, this would not work as well, Its not just 
the hardware registers, which are of concern here, but also the rest of 
the things like ehci->hrtimer pointer which are allocated or initialized 
as part of ehci_setup().

Either the msm controller driver is not correct or we should have a way 
to stop calling ehci_shutdown() if there was no ehci_setup() done yet.

Any suggestions?

--srini