linux-kernel - Re: [PATCH RESEND] usb: gadget: f_mass_storage: Make CD-ROM emulation works with Windows OS

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Message-ID: <YrQby7M/ndikPeLW@kroah.com>
Date:   Thu, 23 Jun 2022 09:52:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Neal Liu <neal_liu@...eedtech.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Roger Quadros <roger.quadros@...ia.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Matthew Wilcox <willy@...radead.org>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Cai Huoqing <cai.huoqing@...ux.dev>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, BMC-SW@...eedtech.com
Subject: Re: [PATCH RESEND] usb: gadget: f_mass_storage: Make CD-ROM
 emulation works with Windows OS

On Thu, Jun 23, 2022 at 11:04:05AM +0800, Neal Liu wrote:
> Add read TOC with format 2 to support CD-ROM emulation with
> Windows OS.
> This patch is tested on Windows OS Server 2019.
> 
> Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> ---
>  drivers/usb/gadget/function/f_mass_storage.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
> index 3a77bca0ebe1..3c2a5f1e8b66 100644
> --- a/drivers/usb/gadget/function/f_mass_storage.c
> +++ b/drivers/usb/gadget/function/f_mass_storage.c
> @@ -1209,6 +1209,7 @@ static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh)
>  
>  	switch (format) {
>  	case 0:
> +	case 1:
>  		/* Formatted TOC */
>  		len = 4 + 2*8;		/* 4 byte header + 2 descriptors */
>  		memset(buf, 0, len);
> -- 
> 2.25.1
> 

Why was this a "RESEND"?  Always put the reason why below the --- line
so we know what is going on...

thanks,

greg k-h