On Thu, Mar 15, 2018 at 7:57 AM, Kirill Marinushkin <k.marinushkin@xxxxxxxxx> wrote: > On 03/13/18 22:23, Andy Shevchenko wrote: >> On Tue, Mar 13, 2018 at 9:34 PM, Kirill Marinushkin >> <k.marinushkin@xxxxxxxxx> wrote: >>> In the current implementation, `rmmod snd_bcm2835` does not release >>> resources properly. It causes an oops when trying to list sound devices. >>> >>> This commit fixes it. >> Nice catch! >> >> See my comments below. >> >>> static void snd_devm_unregister_child(struct device *dev, void *res) >>> { >>> struct device *childdev = *(struct device **)res; >>> + struct bcm2835_chip *chip = dev_get_drvdata(childdev); >>> + struct snd_card *card = chip->card; >>> + >>> + snd_card_free(card); >>> + dev_set_drvdata(childdev, NULL); >> AFAIU this is done by device core. > > Maybe you are right. But I don't know, which function in the device core does it. > It is safe to have this line. So, I suggest to keep it. Please, remove. If you don't know, perhaps you need to spend more time on doing homework? % git grep -n -w dev_set_drvdata -- drivers/base/dd.c drivers/base/dd.c:469: dev_set_drvdata(dev, NULL); drivers/base/dd.c:499: dev_set_drvdata(dev, NULL); drivers/base/dd.c:902: dev_set_drvdata(dev, NULL); Last one is the point of your interest. -- With Best Regards, Andy Shevchenko _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel