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[media] gspca: avoid unused variable warnings

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When CONFIG_INPUT is disabled, multiple gspca backend drivers
print compile-time warnings about unused variables:

media/usb/gspca/cpia1.c: In function 'sd_stopN':
media/usb/gspca/cpia1.c:1627:13: error: unused variable 'sd' [-Werror=unused-variable]
media/usb/gspca/konica.c: In function 'sd_stopN':
media/usb/gspca/konica.c:246:13: error: unused variable 'sd' [-Werror=unused-variable]

This annotates the variables as __maybe_unused, to let the compiler
know that they are declared intentionally.

Fixes: ee186fd96a5f ("[media] gscpa_t613: Add support for the camera button")
Fixes: c2f644aeeba3 ("[media] gspca_cpia1: Add support for button")
Fixes: b517af722860 ("V4L/DVB: gspca_konica: New gspca subdriver for konica chipset using cams")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Arnd Bergmann 2016-07-04 10:21:40 -03:00 committed by Mauro Carvalho Chehab
parent 8ad2d06f68
commit d7e92e15e9
3 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/media/usb/gspca/cpia1.c
View File

@ -1624,7 +1624,7 @@ static int sd_start(struct gspca_dev *gspca_dev)
static void sd_stopN(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
struct sd *sd __maybe_unused = (struct sd *) gspca_dev;
command_pause(gspca_dev);

2
drivers/media/usb/gspca/konica.c
View File

@ -243,7 +243,7 @@ static int sd_start(struct gspca_dev *gspca_dev)
static void sd_stopN(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
struct sd *sd __maybe_unused = (struct sd *) gspca_dev;
konica_stream_off(gspca_dev);
#if IS_ENABLED(CONFIG_INPUT)

2
drivers/media/usb/gspca/t613.c
View File

@ -837,7 +837,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
u8 *data, /* isoc packet */
int len) /* iso packet length */
{
struct sd *sd = (struct sd *) gspca_dev;
struct sd *sd __maybe_unused = (struct sd *) gspca_dev;
int pkt_type;
if (data[0] == 0x5a) {