fpga: zynq-fpga: 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>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/e63d4155f96f3504f7e3d6a4775c3807c90dd6ce.1703006638.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>

diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c
index 96611d424a104ed25b3d618688fd806cff430a1e..0ac93183d201650d8e8a0f9b106bbb6e40183a76 100644 (file)
--- a/drivers/fpga/zynq-fpga.c
+++ b/drivers/fpga/zynq-fpga.c
@@ -618,7 +618,7 @@ static int zynq_fpga_probe(struct platform_device *pdev)
        return 0;
 }
 
-static int zynq_fpga_remove(struct platform_device *pdev)
+static void zynq_fpga_remove(struct platform_device *pdev)
 {
        struct zynq_fpga_priv *priv;
        struct fpga_manager *mgr;
@@ -629,8 +629,6 @@ static int zynq_fpga_remove(struct platform_device *pdev)
        fpga_mgr_unregister(mgr);
 
        clk_unprepare(priv->clk);
-
-       return 0;
 }
 
 #ifdef CONFIG_OF
@@ -644,7 +642,7 @@ MODULE_DEVICE_TABLE(of, zynq_fpga_of_match);
 
 static struct platform_driver zynq_fpga_driver = {
        .probe = zynq_fpga_probe,
-       .remove = zynq_fpga_remove,
+       .remove_new = zynq_fpga_remove,
        .driver = {
                .name = "zynq_fpga_manager",
                .of_match_table = of_match_ptr(zynq_fpga_of_match),