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amba: Fix resource leak for drivers without .remove 

[ Upstream commit de5d7adb89367bbc87b4e5ce7afe7ae9bd86dc12 ]

Consider an amba driver with a .probe but without a .remove callback (e.g.
pl061_gpio_driver). The function amba_probe() is called to bind a device
and so dev_pm_domain_attach() and others are called. As there is no remove
callback amba_remove() isn't called at unbind time however and so calling
dev_pm_domain_detach() is missed and the pm domain keeps active.

To fix this always use the core driver callbacks and handle missing amba
callbacks there. For probe refuse registration as a driver without probe
doesn't make sense.

Fixes: 7cfe249475 ("ARM: AMBA: Add pclk support to AMBA bus infrastructure")
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210126165835.687514-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Uwe Kleine-König 2021-01-26 17:58:31 +01:00 committed by Greg Kroah-Hartman
parent 65159b4401
commit 379b5ee283
1 changed files with 12 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/amba/bus.c
View File

@ -299,10 +299,11 @@ static int amba_remove(struct device *dev)
{
struct amba_device *pcdev = to_amba_device(dev);
struct amba_driver *drv = to_amba_driver(dev->driver);
int ret;
int ret = 0;
pm_runtime_get_sync(dev);
ret = drv->remove(pcdev);
if (drv->remove)
ret = drv->remove(pcdev);
pm_runtime_put_noidle(dev);
/* Undo the runtime PM settings in amba_probe() */
@ -319,7 +320,9 @@ static int amba_remove(struct device *dev)
static void amba_shutdown(struct device *dev)
{
struct amba_driver *drv = to_amba_driver(dev->driver);
drv->shutdown(to_amba_device(dev));
if (drv->shutdown)
drv->shutdown(to_amba_device(dev));
}
/**
@ -332,12 +335,13 @@ static void amba_shutdown(struct device *dev)
*/
int amba_driver_register(struct amba_driver *drv)
{
drv->drv.bus = &amba_bustype;
if (!drv->probe)
return -EINVAL;
#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
SETFN(probe);
SETFN(remove);
SETFN(shutdown);
drv->drv.bus = &amba_bustype;
drv->drv.probe = amba_probe;
drv->drv.remove = amba_remove;
drv->drv.shutdown = amba_shutdown;
return driver_register(&drv->drv);
}