dmaengine: uniphier-xdmac: 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().

There is an error path that has the above mentioned problem. This patch
only adds a more drastic error message. To properly fix it,
dmaengine_terminate_sync() must be known to have succeeded (or that it's
safe to not call it as other drivers seem to assume).

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231105093415.3704633-10-u.kleine-koenig@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/uniphier-xdmac.c b/drivers/dma/uniphier-xdmac.c
index 3a8ee2b173b52e83b775bbe27d5f715a205aef87..3ce2dc2ad9de4290887e6c5344206d0e747b0c7f 100644 (file)
--- a/drivers/dma/uniphier-xdmac.c
+++ b/drivers/dma/uniphier-xdmac.c
@@ -563,7 +563,7 @@ out_unregister_dmac:
        return ret;
 }
 
-static int uniphier_xdmac_remove(struct platform_device *pdev)
+static void uniphier_xdmac_remove(struct platform_device *pdev)
 {
        struct uniphier_xdmac_device *xdev = platform_get_drvdata(pdev);
        struct dma_device *ddev = &xdev->ddev;
@@ -579,15 +579,20 @@ static int uniphier_xdmac_remove(struct platform_device *pdev)
         */
        list_for_each_entry(chan, &ddev->channels, device_node) {
                ret = dmaengine_terminate_sync(chan);
-               if (ret)
-                       return ret;
+               if (ret) {
+                       /*
+                        * This results in resource leakage and maybe also
+                        * use-after-free errors as e.g. *xdev is kfreed.
+                        */
+                       dev_alert(&pdev->dev, "Failed to terminate channel %d (%pe)\n",
+                                 chan->chan_id, ERR_PTR(ret));
+                       return;
+               }
                uniphier_xdmac_free_chan_resources(chan);
        }
 
        of_dma_controller_free(pdev->dev.of_node);
        dma_async_device_unregister(ddev);
-
-       return 0;
 }
 
 static const struct of_device_id uniphier_xdmac_match[] = {
@@ -598,7 +603,7 @@ MODULE_DEVICE_TABLE(of, uniphier_xdmac_match);
 
 static struct platform_driver uniphier_xdmac_driver = {
        .probe = uniphier_xdmac_probe,
-       .remove = uniphier_xdmac_remove,
+       .remove_new = uniphier_xdmac_remove,
        .driver = {
                .name = "uniphier-xdmac",
                .of_match_table = uniphier_xdmac_match,