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SubjectRe: [PATCHv2 2/2] check quirk to pad epout buf size when not aligned to maxpacketsize
On 11/11/2013 03:21 AM, Michal Nazarewicz wrote:
> Check gadget.quirk_ep_out_aligned_size to decide if buffer size requires
> to be aligned to maxpacketsize of an out endpoint. ffs_epfile_io() needs
> to pad epout buffer to match above condition if quirk is found.
>
> Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
> ---
> drivers/usb/gadget/f_fs.c | 23 +++++++++++++++++++----
> 1 file changed, 19 insertions(+), 4 deletions(-)
>
>> On 11/10/2013 08:50 AM, Michal Nazarewicz wrote:
>>> @@ -787,6 +788,13 @@ static ssize_t ffs_epfile_io(struct file *file,
>>>
>>> /* Allocate & copy */
>>> if (!halt) {
>>> + /*
>>> + * Controller requires buffer size to be aligned to
>>> + * maxpacketsize of an out endpoint.
>>> + */
>>> + data_len = read && gadget->quirk_ep_out_aligned_size ?
>>> + usb_ep_align_maxpacketsize(ep->ep, len) : len;
>>> +
>>> data = kmalloc(len, GFP_KERNEL);
>
> On Mon, Nov 11 2013, David Cohen <david.a.cohen@linux.intel.com> wrote:
>> Shouldn't this kmalloc() allocate 'data_len' bytes, instead of 'len'?
>
> Yes, of coures.
>
> diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
> index e496b72..fd769a8 100644
> --- a/drivers/usb/gadget/f_fs.c
> +++ b/drivers/usb/gadget/f_fs.c

[snip]

> ret = ep->status;
> if (read && ret > 0 &&
> - unlikely(copy_to_user(buf, data, ret)))
> + unlikely(copy_to_user(buf, data, min(ret, len))))

You need to replace min(ret, len) by min_t(size_t, ret, len) to avoid
this warning:
drivers/usb/gadget/f_fs.c:858:124: warning: comparison of distinct
pointer types lacks a cast [enabled by default]

Once again, you (or me) need to reply to my v5 patch set.

Br, David


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