linux-kernel - Re: [PATCH] usb: cdns3: Fix: ARM core hang after connect/disconnect operation.

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Date:   Wed, 8 Jan 2020 15:22:50 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     felipe.balbi@...ux.intel.com, rogerq@...com, jbergsagel@...com,
        nsekhar@...com, nm@...com, linux-kernel@...r.kernel.org,
        jpawar@...ence.com, kurahul@...ence.com, sparmar@...ence.com,
        Peter Chan <peter.chan@....com>
Subject: Re: [PATCH] usb: cdns3: Fix: ARM core hang after connect/disconnect
 operation.

On Wed, Jan 08, 2020 at 12:37:18PM +0100, Pawel Laszczak wrote:
> The ARM core hang when access USB register after tens of thousands
> connect/disconnect operation.
> 
> The issue was observed on platform with android system and is not easy
> to reproduce. During test controller works at HS device mode with host
> connected.
> 
> The test is based on continuous disabling/enabling USB device function
> what cause continuous setting DEVDS/DEVEN bit in USB_CONF register.
> 
> For testing was used composite device consisting from ADP and RNDIS
> function.
> 
> Presumably the problem was caused by DMA transfer made after setting
> DEVDS bit. To resolve this issue fix stops all DMA transfer before
> setting DEVDS bit.
> 
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> Signed-off-by: Peter Chan <peter.chan@....com>
> Reported-by: Peter Chan <peter.chan@....com>
> Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
> ---
>  drivers/usb/cdns3/gadget.c | 84 ++++++++++++++++++++++++++------------
>  drivers/usb/cdns3/gadget.h |  1 +
>  2 files changed, 58 insertions(+), 27 deletions(-)

Any reason to forget linux-usb@...r.kernel.org for usb patches?

thanks,

greg k-h