Messages in this thread | | | Date | Fri, 31 Aug 2007 04:27:13 +0530 (IST) | From | Satyam Sharma <> | Subject | Re: [PATCH] input: Silence 'unused variable' warning in iforce joystick driver |
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Hi,
On Fri, 31 Aug 2007, Jesper Juhl wrote:
> In the iforce driver we currently get this warning > > drivers/input/joystick/iforce/iforce-packets.c: In function 'iforce_get_id_packet': > drivers/input/joystick/iforce/iforce-packets.c:249: warning: unused variable 'status' > > if CONFIG_JOYSTICK_IFORCE_USB is not defined. > > The warning is easy to avoid by simply moving the variable inside > the only case in the switch that actually use it. > > > Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> > --- > > diff --git a/drivers/input/joystick/iforce/iforce-packets.c b/drivers/input/joystick/iforce/iforce-packets.c > index 3154ccd..48d4a86 100644 > --- a/drivers/input/joystick/iforce/iforce-packets.c > +++ b/drivers/input/joystick/iforce/iforce-packets.c > @@ -246,13 +246,12 @@ void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data) > > int iforce_get_id_packet(struct iforce *iforce, char *packet) > { > - int status; > - > switch (iforce->bus) { > > case IFORCE_USB: > - > #ifdef CONFIG_JOYSTICK_IFORCE_USB > + int status; > + > iforce->cr.bRequest = packet[0]; > iforce->ctrl->dev = iforce->usbdev;
Hmm, would this not still give a warning when JOYSTICK_IFORCE_USB=y? [ I didn't know mixing code and declarations (not at top of statement block) was accepted style in the kernel ... ]
IMHO either you should at least wrap that case inside a {} of its own (so that the int status; is at top of a statement block), or else, preferably, just add "__maybe_unused" to the first declaration that you removed just now.
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