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

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Message-ID: <20160713074114.76c35d04@recife.lan>
Date:	Wed, 13 Jul 2016 07:41:14 -0300
From:	Mauro Carvalho Chehab <mchehab@....samsung.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.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>, linux-bluetooth@...r.kernel.org,
	linux-media@...r.kernel.org, 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

Em Mon,  6 Jun 2016 11:02:03 +0200
Geert Uytterhoeven <geert@...ux-m68k.org> escreveu:

> 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>

Patch looks sane to me, but who will apply it?

Anyway:

Acked-by: Mauro Carvalho Chehab <mchehab@...pensource.com>


> ---
> 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(-)
> 
> diff --git a/drivers/bluetooth/btwilink.c b/drivers/bluetooth/btwilink.c
> index 24a652f9252be899..485281b3f1677678 100644
> --- a/drivers/bluetooth/btwilink.c
> +++ b/drivers/bluetooth/btwilink.c
> @@ -51,7 +51,7 @@
>   */
>  struct ti_st {
>  	struct hci_dev *hdev;
> -	char reg_status;
> +	int reg_status;
>  	long (*st_write) (struct sk_buff *);
>  	struct completion wait_reg_completion;
>  };
> @@ -83,7 +83,7 @@ static inline void ti_st_tx_complete(struct ti_st *hst, int pkt_type)
>   * status.ti_st_open() function will wait for signal from this
>   * API when st_register() function returns ST_PENDING.
>   */
> -static void st_reg_completion_cb(void *priv_data, char data)
> +static void st_reg_completion_cb(void *priv_data, int data)
>  {
>  	struct ti_st *lhst = priv_data;
>  
> diff --git a/drivers/media/radio/wl128x/fmdrv_common.c b/drivers/media/radio/wl128x/fmdrv_common.c
> index 3f9e6df7d837ac27..642b89c66bcb99eb 100644
> --- a/drivers/media/radio/wl128x/fmdrv_common.c
> +++ b/drivers/media/radio/wl128x/fmdrv_common.c
> @@ -1472,7 +1472,7 @@ static long fm_st_receive(void *arg, struct sk_buff *skb)
>   * Called by ST layer to indicate protocol registration completion
>   * status.
>   */
> -static void fm_st_reg_comp_cb(void *arg, char data)
> +static void fm_st_reg_comp_cb(void *arg, int data)
>  {
>  	struct fmdev *fmdev;
>  
> diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
> index dcdbd58672ccc6d2..00051590e00f9647 100644
> --- a/drivers/misc/ti-st/st_core.c
> +++ b/drivers/misc/ti-st/st_core.c
> @@ -141,7 +141,7 @@ static void st_send_frame(unsigned char chnl_id, struct st_data_s *st_gdata)
>   * This function is being called with spin lock held, protocol drivers are
>   * only expected to complete their waits and do nothing more than that.
>   */
> -static void st_reg_complete(struct st_data_s *st_gdata, char err)
> +static void st_reg_complete(struct st_data_s *st_gdata, int err)
>  {
>  	unsigned char i = 0;
>  	pr_info(" %s ", __func__);
> diff --git a/drivers/nfc/nfcwilink.c b/drivers/nfc/nfcwilink.c
> index f81e500e765061fd..3fbd18b8e473f696 100644
> --- a/drivers/nfc/nfcwilink.c
> +++ b/drivers/nfc/nfcwilink.c
> @@ -94,7 +94,7 @@ struct nfcwilink {
>  	struct nci_dev			*ndev;
>  	unsigned long			flags;
>  
> -	char				st_register_cb_status;
> +	int				st_register_cb_status;
>  	long				(*st_write) (struct sk_buff *);
>  
>  	struct completion		completed;
> @@ -320,7 +320,7 @@ exit:
>  }
>  
>  /* Called by ST when registration is complete */
> -static void nfcwilink_register_complete(void *priv_data, char data)
> +static void nfcwilink_register_complete(void *priv_data, int data)
>  {
>  	struct nfcwilink *drv = priv_data;
>  
> diff --git a/include/linux/ti_wilink_st.h b/include/linux/ti_wilink_st.h
> index 0a0d56834c8eb412..f2293028ab9d65e6 100644
> --- a/include/linux/ti_wilink_st.h
> +++ b/include/linux/ti_wilink_st.h
> @@ -71,7 +71,7 @@ struct st_proto_s {
>  	enum proto_type type;
>  	long (*recv) (void *, struct sk_buff *);
>  	unsigned char (*match_packet) (const unsigned char *data);
> -	void (*reg_complete_cb) (void *, char data);
> +	void (*reg_complete_cb) (void *, int data);
>  	long (*write) (struct sk_buff *skb);
>  	void *priv_data;
>  


-- 
Thanks,
Mauro