linux-kernel - Re: [PATCH v3 2/3] usb: gadget: file_storage: Make CD-ROM emulation work with Mac OS-X

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Date:	Wed, 11 May 2011 10:52:35 +0300
From:	Roger Quadros <roger.quadros@...ia.com>
To:	ext Michal Nazarewicz <mina86@...a86.com>
CC:	<gregkh@...e.de>, <stern@...land.harvard.edu>,
	<sshtylyov@...sta.com>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] usb: gadget: file_storage: Make CD-ROM emulation
 work with Mac OS-X

On 04/05/2011 06:45 PM, ext Michal Nazarewicz wrote:
> On Tue, 05 Apr 2011 16:59:28 +0200, Roger Quadros <roger.quadros@...ia.com> wrote:
>> --- a/drivers/usb/gadget/file_storage.c
>> +++ b/drivers/usb/gadget/file_storage.c
>> @@ -1703,18 +1705,21 @@ static int do_read_toc(struct fsg_dev *fsg, struct
>> fsg_buffhd *bh)
>> return -EINVAL;
>> }
>> - memset(buf, 0, 20);
>> - buf[1] = (20-2); /* TOC data length */
>> - buf[2] = 1; /* First track number */
>> - buf[3] = 1; /* Last track number */
>> - buf[5] = 0x16; /* Data track, copying allowed */
>> - buf[6] = 0x01; /* Only track is number 1 */
>> - store_cdrom_address(&buf[8], msf, 0);
>> + format = fsg->cmnd[2] & 0xf;
>> + /*
>> + * Check if CDB is old style SFF-8020i
>> + * i.e. format is in 2 MSBs of byte 9
>> + * Mac OS-X host sends us this.
>> + */
>> + if (format == 0)
>> + format = (fsg->cmnd[9] >> 6) & 0x3;
>> - buf[13] = 0x16; /* Lead-out track is data */
>> - buf[14] = 0xAA; /* Lead-out track number */
>> - store_cdrom_address(&buf[16], msf, curlun->num_sectors);
>> - return 20;
>> + ret = fsg_get_toc(curlun, msf, format, buf);
>> + if (ret < 0) {
>> + curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
>> + return -EINVAL;
>> + }
>
> I'd drop the “return -EINVAL;” and let “return ret;” below handle it.
> This obviously also apply to patch to f_mass_storage.c (BTW. I would
> merge the two patches).

OK, I will fix this.
>
>> + return ret;
>> }
>
Thanks for review.

-- 
regards,
-roger
--
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