On Mon, May 30, 2022 at 04:02:46PM +0200, Javier Martinez Canillas wrote:

The kernel test robot reports a compile warning due the ssd130x_spi_table variable being defined but not used. This happen when ssd130x-spi driver is built-in instead of being built as a module, i.e:

CC drivers/gpu/drm/solomon/ssd130x-spi.o AR drivers/base/firmware_loader/built-in.a AR drivers/base/built-in.a CC kernel/trace/trace.o drivers/gpu/drm/solomon/ssd130x-spi.c:155:35: warning: ‘ssd130x_spi_table’ defined but not used [-Wunused-const-variable=] 155 | static const struct spi_device_id ssd130x_spi_table[] = { | ^~~~~~~~~~~~~~~~~

The driver shouldn't need a SPI device ID table and only have an OF device ID table, but the former is needed to workaround an issue in the SPI core. This always reports a MODALIAS of the form "spi:<device>" even for devices registered through Device Trees.

But the table is only needed when the driver built as a module to populate the .ko alias info. It's not needed when the driver is built-in the kernel.

Fixes: 74373977d2ca ("drm/solomon: Add SSD130x OLED displays SPI support") Reported-by: kernel test robot lkp@intel.com Signed-off-by: Javier Martinez Canillas javierm@redhat.com

Reviewed-by: Nathan Chancellor nathan@kernel.org

---

drivers/gpu/drm/solomon/ssd130x-spi.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/solomon/ssd130x-spi.c b/drivers/gpu/drm/solomon/ssd130x-spi.c index 43722adab1f8..07802907e39a 100644 --- a/drivers/gpu/drm/solomon/ssd130x-spi.c +++ b/drivers/gpu/drm/solomon/ssd130x-spi.c @@ -143,6 +143,7 @@ static const struct of_device_id ssd130x_of_match[] = { }; MODULE_DEVICE_TABLE(of, ssd130x_of_match);

+#if IS_MODULE(CONFIG_DRM_SSD130X_SPI) /*

• The SPI core always reports a MODALIAS uevent of the form "spi:<dev>", even
• if the device was registered via OF. This means that the module will not be

@@ -160,6 +161,7 @@ static const struct spi_device_id ssd130x_spi_table[] = { { /* sentinel */ } }; MODULE_DEVICE_TABLE(spi, ssd130x_spi_table); +#endif

static struct spi_driver ssd130x_spi_driver = { .driver = { -- 2.36.1