Re: [PATCH 2/2] usb: gadget: f_fs: stop sleeping in ffs_func_eps_disable

[John Stultz <john.stultz@linaro.org>]

On Mon, Oct 3, 2016 at 5:07 PM, Michal Nazarewicz <mina86@mina86.com> wrote:
> ffs_func_eps_disable is called from atomic context so it cannot sleep
> thus cannot grab a mutex.  Change the handling of epfile->read_buffer
> to use non-sleeping synchronisation method.
>
> Reported-by: Chen Yu <chenyu56@huawei.com>
> Signed-off-by: Michał Nazarewicz <mina86@mina86.com>
> Fixes: 9353afbbfa7b ("buffer data from ‘oversized’ OUT requests")
> Tested-by: Chen Yu <chenyu56@huawei.com>
> ---
>  drivers/usb/gadget/function/f_fs.c | 109 +++++++++++++++++++++++++++++++------
>  1 file changed, 93 insertions(+), 16 deletions(-)
>
> Compared to the previous version:
> • this one has a bit more comments (I feel like it’s a bad sign that
>   this needs so much documentation);
> • ffs_epfile_realese sets read_buffer to READ_BUFFER_DROP (which
>   doesn’t matter since on entry __ffs_epfile_read_buffered behaves
>   the same way when read_buffer is NULL or READ_BUFFER_DROP); and
> • __ffs_epfile_read_data will drop the temporary data if read_buffer
>   is READ_BUFFER_DROP (which may happen if ep is disabled between ep
>   request finishes and data is copied to user space).
>
> Chen, John, if you could test this version as well, that would be
> swell.

for both patches:

Tested-by: John Stultz <john.stultz@linaro.org>

Thanks so much for these!
-john