scsi: a4000t: 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().

In the error path emit an error message replacing the (less useful)
message by the core. Apart from the improved error message there is no
change in behaviour.

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>
Link: https://lore.kernel.org/r/c15ffc57efebc5da3f7e6dd558d69181e129cafe.1701619134.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/a4000t.c b/drivers/scsi/a4000t.c
index 5e575afce134d80fab95f7642851f87e9c45b57b..e435fc06a6246b816a761434d3cab61b4c7b617e 100644 (file)
--- a/drivers/scsi/a4000t.c
+++ b/drivers/scsi/a4000t.c
@@ -95,7 +95,7 @@ static int __init amiga_a4000t_scsi_probe(struct platform_device *pdev)
        return -ENODEV;
 }
 
-static int __exit amiga_a4000t_scsi_remove(struct platform_device *pdev)
+static void __exit amiga_a4000t_scsi_remove(struct platform_device *pdev)
 {
        struct Scsi_Host *host = platform_get_drvdata(pdev);
        struct NCR_700_Host_Parameters *hostdata = shost_priv(host);
@@ -106,11 +106,10 @@ static int __exit amiga_a4000t_scsi_remove(struct platform_device *pdev)
        kfree(hostdata);
        free_irq(host->irq, host);
        release_mem_region(res->start, resource_size(res));
-       return 0;
 }
 
 static struct platform_driver amiga_a4000t_scsi_driver = {
-       .remove = __exit_p(amiga_a4000t_scsi_remove),
+       .remove_new = __exit_p(amiga_a4000t_scsi_remove),
        .driver   = {
                .name   = "amiga-a4000t-scsi",
        },