[PATCH 2/2] usb: fastboot: umount device before writing to it

[Oleksij Rempel]

On 03/10/2017 08:32 AM, Sascha Hauer wrote:
> On Wed, Mar 08, 2017 at 10:24:02AM +0100, Oleksij Rempel wrote:
>> From: Sascha Hauer <s.hauer at pengutronix.de>
>>
>> When a fastboot target refers to a device and we are going to write
>> to it, umount it beforehand, so that we do not end up with corrupt
>> data after writing.
>>
>> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
>> ---
>>  drivers/usb/gadget/f_fastboot.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
>> index a6192b9eb..8d69aea8b 100644
>> --- a/drivers/usb/gadget/f_fastboot.c
>> +++ b/drivers/usb/gadget/f_fastboot.c
>> @@ -754,6 +754,7 @@ static void cb_flash(struct usb_ep *ep, struct usb_request *req, const char *cmd
>>  		goto out;
>>  	}
>>
>> +	umount(filename);
>
> I'm not sure about this one. We should probably rather bail out with an
> error when it's mounted. When it's mounted then the result is undesired,
> even when we unmount it before flashing.

hm... for this case we will probably need some function to check if 
device is mounted. something like: is_mounted(path). Or, is there some 
other way to do this?