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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2020-11-19 17:16:02 +0100
committerMark Brown <broonie@kernel.org>2020-11-20 13:49:10 +0000
commit440408dbadfe47a615afd0a0a4a402e629be658a (patch)
treee377ee9a66425d67efb78ad2cfc6319128644643 /drivers/spi/spi.c
parent03fc41afaa6549baa2dab7a84e1afaf5cadb5b18 (diff)
spi: fix resource leak for drivers without .remove callback
Consider an spi driver with a .probe but without a .remove callback (e.g. rtc-ds1347). The function spi_drv_probe() is called to bind a device and so dev_pm_domain_attach() is called. As there is no remove callback spi_drv_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 both spi_drv_probe() and spi_drv_remove() and make them handle the respective callback not being set. This has the side effect that for a (hypothetical) driver that has neither .probe nor remove the clk and pm domain setup is done. Fixes: 33cf00e57082 ("spi: attach/detach SPI device to the ACPI power domain") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20201119161604.2633521-1-u.kleine-koenig@pengutronix.de Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi.c')
-rw-r--r--drivers/spi/spi.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 22679c8645db..6b1e76371976 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -405,9 +405,11 @@ static int spi_drv_probe(struct device *dev)
if (ret)
return ret;
- ret = sdrv->probe(spi);
- if (ret)
- dev_pm_domain_detach(dev, true);
+ if (sdrv->probe) {
+ ret = sdrv->probe(spi);
+ if (ret)
+ dev_pm_domain_detach(dev, true);
+ }
return ret;
}
@@ -415,9 +417,10 @@ static int spi_drv_probe(struct device *dev)
static int spi_drv_remove(struct device *dev)
{
const struct spi_driver *sdrv = to_spi_driver(dev->driver);
- int ret;
+ int ret = 0;
- ret = sdrv->remove(to_spi_device(dev));
+ if (sdrv->remove)
+ ret = sdrv->remove(to_spi_device(dev));
dev_pm_domain_detach(dev, true);
return ret;
@@ -442,10 +445,8 @@ int __spi_register_driver(struct module *owner, struct spi_driver *sdrv)
{
sdrv->driver.owner = owner;
sdrv->driver.bus = &spi_bus_type;
- if (sdrv->probe)
- sdrv->driver.probe = spi_drv_probe;
- if (sdrv->remove)
- sdrv->driver.remove = spi_drv_remove;
+ sdrv->driver.probe = spi_drv_probe;
+ sdrv->driver.remove = spi_drv_remove;
if (sdrv->shutdown)
sdrv->driver.shutdown = spi_drv_shutdown;
return driver_register(&sdrv->driver);