From: "Uwe Kleine-König" <uwe@kleine-koenig.org>
To: Russell King <linux@armlinux.org.uk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Arnd Bergmann <arnd@arndb.de>,
Linus Walleij <linus.walleij@linaro.org>,
Ulf Hansson <ulf.hansson@linaro.org>
Cc: "Rob Herring" <robh@kernel.org>,
linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de,
linux-kernel@vger.kernel.org,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Subject: [PATCH v2 1/5] amba: Fix resource leak for drivers without .remove
Date: Tue, 24 Nov 2020 14:31:35 +0100 [thread overview]
Message-ID: <20201124133139.3072124-2-uwe@kleine-koenig.org> (raw)
In-Reply-To: <20201124133139.3072124-1-uwe@kleine-koenig.org>
From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
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")
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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 ecc304149067..b5f5ca4e3f34 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -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);
}
--
2.29.2
next prev parent reply other threads:[~2020-11-24 13:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 13:31 [PATCH v2 0/5] amba: minor fix and various cleanups Uwe Kleine-König
2020-11-24 13:31 ` Uwe Kleine-König [this message]
2020-11-24 13:31 ` [PATCH v2 2/5] amba: reorder functions Uwe Kleine-König
2020-11-24 13:31 ` [PATCH v2 3/5] vfio: platform: simplify device removal Uwe Kleine-König
2020-12-02 15:15 ` Auger Eric
2020-11-24 13:31 ` [PATCH v2 4/5] amba: Make the remove callback return void Uwe Kleine-König
2020-12-03 11:53 ` Uwe Kleine-König
2020-12-03 13:01 ` Uwe Kleine-König
2020-12-03 14:11 ` Krzysztof Kozlowski
2020-12-03 14:16 ` Mark Brown
2020-12-03 19:36 ` Dmitry Torokhov
2020-12-14 20:40 ` Uwe Kleine-König
2020-12-17 10:00 ` Linus Walleij
2020-12-03 13:44 ` Alexandre Belloni
2020-11-24 13:31 ` [PATCH v2 5/5] amba: Make use of bus_type functions Uwe Kleine-König
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