Messages in this thread Patch in this message | | | From | Uwe Kleine-König <> | Subject | [PATCH 2/4] amba: Fix resource leak for drivers without .remove | Date | Tue, 24 Nov 2020 11:32:40 +0100 |
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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: 7cfe249475fd ("ARM: AMBA: Add pclk support to AMBA bus infrastructure") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> --- drivers/amba/bus.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c index 8658e0533b67..8c4a42df47c6 100644 --- a/drivers/amba/bus.c +++ b/drivers/amba/bus.c @@ -300,10 +300,11 @@ 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() */ @@ -320,7 +321,9 @@ 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)); } /** @@ -333,12 +336,13 @@ 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); } -- 2.29.2
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