sbus: display7seg: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Link: https://lore.kernel.org/r/dc10c77a6ababab6ffdb344982e8a04cc337bdc7.1709591118.git.u.kleine-koenig@pengutronix.de

diff --git a/drivers/sbus/char/display7seg.c b/drivers/sbus/char/display7seg.c
index 18e6f84e754f279151069259b9a50a52561b9a88..521cf8affe65a1b4ff100c51b41e87ba79859157 100644 (file)
--- a/drivers/sbus/char/display7seg.c
+++ b/drivers/sbus/char/display7seg.c
@@ -229,7 +229,7 @@ out_iounmap:
        goto out;
 }
 
-static int d7s_remove(struct platform_device *op)
+static void d7s_remove(struct platform_device *op)
 {
        struct d7s *p = dev_get_drvdata(&op->dev);
        u8 regs = readb(p->regs);
@@ -245,8 +245,6 @@ static int d7s_remove(struct platform_device *op)
 
        misc_deregister(&d7s_miscdev);
        of_iounmap(&op->resource[0], p->regs, sizeof(u8));
-
-       return 0;
 }
 
 static const struct of_device_id d7s_match[] = {
@@ -263,7 +261,7 @@ static struct platform_driver d7s_driver = {
                .of_match_table = d7s_match,
        },
        .probe          = d7s_probe,
-       .remove         = d7s_remove,
+       .remove_new     = d7s_remove,
 };
 
 module_platform_driver(d7s_driver);