linux-kernel - Re: [PATCH] usb: gadget: mass_storage: add READ

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Date:   Wed, 26 Jan 2022 11:51:09 +0100
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>,
        Chen Lin <chen.lin5@....com.cn>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Cai Huoqing <caihuoqing@...du.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        BMC-SW@...eedtech.com
Subject: Re: [PATCH] usb: gadget: mass_storage: add READ_TOC cmd mask check

On Wed, Jan 26, 2022 at 06:08:56PM +0800, Neal Liu wrote:
> READ_TOC cmnd[2] specifies Format Field which is defined
> in SCSI-3 spec. Add command mask to avoid marking this
> sense data as invalid.
> 
> Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> ---
>  drivers/usb/gadget/function/f_mass_storage.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
> index 46dd11dcb3a8..14d51695b8ae 100644
> --- a/drivers/usb/gadget/function/f_mass_storage.c
> +++ b/drivers/usb/gadget/function/f_mass_storage.c
> @@ -1944,7 +1944,7 @@ static int do_scsi_command(struct fsg_common *common)
>  		common->data_size_from_cmnd =
>  			get_unaligned_be16(&common->cmnd[7]);
>  		reply = check_command(common, 10, DATA_DIR_TO_HOST,
> -				      (7<<6) | (1<<1), 1,
> +				      (7<<6) | (1<<1) | (1<<2), 1,

Can we have real names here instead of magic numbers?

And what commit does this fix?  Is it a regression or has it always
never worked properly?

thanks,

greg k-h