On Tue, 23 Sep 2014, Jason Gerecke wrote:

> The commit which introduced TransducerSerialNumber (368c966) is missing
> two crucial implementation details. Firstly, the commit does not set the
> type/code/bit/max fields as expected later down the code which can cause
> the driver to crash when a tablet with this usage is connected. Secondly,
> the call to 'set_bit' causes MSC_PULSELED to be sent instead of the
> expected MSC_SERIAL. This commit addreses both issues.
> 
> Signed-off-by: Jason Gerecke <[email protected]>
> ---
>  drivers/hid/hid-input.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index 2619f7f..cb1b3fa 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -689,7 +689,10 @@ static void hidinput_configure_usage(struct hid_input 
> *hidinput, struct hid_fiel
>                       break;
>  
>               case 0x5b: /* TransducerSerialNumber */
> -                     set_bit(MSC_SERIAL, input->mscbit);
> +                     usage->type = EV_MSC;
> +                     usage->code = MSC_SERIAL;
> +                     bit = input->mscbit;
> +                     max = MSC_MAX;
>                       break;
>  

Apologizes for the delay. I have now queued this for 3.18 still.

-- 
Jiri Kosina
SUSE Labs
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