linux-kernel - Re: [PATCH] drivers: misc: ti-st: Use int instead of fuzzy char for callback status

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Date:	Wed, 13 Jul 2016 14:12:36 +0100
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
	Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Pavan Savoy <pavan_savoy@...com>,
	Arnd Bergmann <arnd@...db.de>,
	"open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
	linux-media@...r.kernel.org,
	linux-wireless <linux-wireless@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: misc: ti-st: Use int instead of fuzzy char for callback status

Hi Geert,

> On mips and parisc:
> 
>    drivers/bluetooth/btwilink.c: In function 'ti_st_open':
>    drivers/bluetooth/btwilink.c:174:21: warning: overflow in implicit constant conversion [-Woverflow]
>       hst->reg_status = -EINPROGRESS;
> 
>    drivers/nfc/nfcwilink.c: In function 'nfcwilink_open':
>    drivers/nfc/nfcwilink.c:396:31: warning: overflow in implicit constant conversion [-Woverflow]
>      drv->st_register_cb_status = -EINPROGRESS;
> 
> There are actually two issues:
>  1. Whether "char" is signed or unsigned depends on the architecture.
>     As the completion callback data is used to pass a (negative) error
>     code, it should always be signed.
>  2. EINPROGRESS is 150 on mips, 245 on parisc.
>     Hence -EINPROGRESS doesn't fit in a signed 8-bit number.
> 
> Change the callback status from "char" to "int" to fix these.
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
> Compile-tested only.
> ---
> drivers/bluetooth/btwilink.c              | 4 ++--
> drivers/media/radio/wl128x/fmdrv_common.c | 2 +-
> drivers/misc/ti-st/st_core.c              | 2 +-
> drivers/nfc/nfcwilink.c                   | 4 ++--
> include/linux/ti_wilink_st.h              | 2 +-
> 5 files changed, 7 insertions(+), 7 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel