mtd: dataflash: Warn about failure to unregister mtd device

mtd_device_unregister() shouldn't fail. Wail loudly if it does anyhow.

This matches how other drivers (e.g. nand/raw/nandsim.c) use
mtd_device_unregister().

By returning 0 in the spi remove callback a generic error message by the
spi framework (and nothing else) is suppressed.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20211108093153.63792-1-u.kleine-koenig@pengutronix.de

diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index 9802e26..293cab7 100644 (file)
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -912,14 +912,14 @@ static int dataflash_probe(struct spi_device *spi)
 static int dataflash_remove(struct spi_device *spi)
 {
        struct dataflash        *flash = spi_get_drvdata(spi);
-       int                     status;
 
        dev_dbg(&spi->dev, "remove\n");
 
-       status = mtd_device_unregister(&flash->mtd);
-       if (status == 0)
-               kfree(flash);
-       return status;
+       WARN_ON(mtd_device_unregister(&flash->mtd));
+
+       kfree(flash);
+
+       return 0;
 }
 
 static struct spi_driver dataflash_driver = {