linux-kernel - Re: [PATCH 3/3] usb: gadgetfs: return USB_GADGET_DELAYED

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Date:   Mon, 28 Aug 2023 10:52:32 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     andrey.konovalov@...ux.dev
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Pawel Laszczak <pawell@...ence.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Minas Harutyunyan <hminas@...opsys.com>,
        Justin Chen <justin.chen@...adcom.com>,
        Al Cooper <alcooperx@...il.com>,
        Herve Codina <herve.codina@...tlin.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] usb: gadgetfs: return USB_GADGET_DELAYED_STATUS from
 setup()

On Mon, Aug 28, 2023 at 04:10:32AM +0200, andrey.konovalov@...ux.dev wrote:
> From: Andrey Konovalov <andreyknvl@...il.com>
> 
> Return USB_GADGET_DELAYED_STATUS from the setup() callback for 0-length
> transfers as a workaround to stop some UDC drivers (e.g. dwc3) from
> automatically proceeding with the status stage.
> 
> This workaround should be removed once all UDC drivers are fixed to
> always delay the status stage until a response is queued to EP0.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...il.com>
> ---
>  drivers/usb/gadget/legacy/inode.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
> index 28249d0bf062..154bbf578ba2 100644
> --- a/drivers/usb/gadget/legacy/inode.c
> +++ b/drivers/usb/gadget/legacy/inode.c
> @@ -31,6 +31,7 @@
>  
>  #include <linux/usb/gadgetfs.h>
>  #include <linux/usb/gadget.h>
> +#include <linux/usb/composite.h>

Add:  /* for USB_GADGET_DELAYED_STATUS */

>  
>  
>  /*
> @@ -241,6 +242,7 @@ static DEFINE_MUTEX(sb_mutex);		/* Serialize superblock operations */
>  #define xprintk(d,level,fmt,args...) \
>  	printk(level "%s: " fmt , shortname , ## args)
>  
> +#undef DBG
>  #ifdef DEBUG
>  #define DBG(dev,fmt,args...) \
>  	xprintk(dev , KERN_DEBUG , fmt , ## args)
> @@ -256,8 +258,10 @@ static DEFINE_MUTEX(sb_mutex);		/* Serialize superblock operations */
>  	do { } while (0)
>  #endif /* DEBUG */
>  
> +#undef ERROR
>  #define ERROR(dev,fmt,args...) \
>  	xprintk(dev , KERN_ERR , fmt , ## args)
> +#undef INFO

Please move these #undef lines up, just after the new #include.  And 
add a comment explaining briefly why they are needed.

Aside from these changes,

Reviewed-by: Alan Stern <stern@...land.harvard.edu>