6.6-stable review patch. If anyone has any objections, please let me know.
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From: Dmitry Torokhov dmitry.torokhov@gmail.com
commit 04d3e5461c1f5cf8eec964ab64948ebed826e95e upstream.
In preparation to closing a race when reading driver pointer in dev_uevent() code, instead of setting device->driver pointer directly introduce device_set_driver() helper.
Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Reviewed-by: Masami Hiramatsu (Google) mhiramat@kernel.org Link: https://lore.kernel.org/r/20250311052417.1846985-2-dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/base/base.h | 6 ++++++ drivers/base/core.c | 2 +- drivers/base/dd.c | 6 +++--- 3 files changed, 10 insertions(+), 4 deletions(-)
--- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -179,6 +179,12 @@ int driver_add_groups(struct device_driv void driver_remove_groups(struct device_driver *drv, const struct attribute_group **groups); void device_driver_detach(struct device *dev);
+static inline void device_set_driver(struct device *dev, const struct device_driver *drv) +{ + // FIXME - this cast should not be needed "soon" + dev->driver = (struct device_driver *)drv; +} + int devres_release_all(struct device *dev); void device_block_probing(void); void device_unblock_probing(void); --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3688,7 +3688,7 @@ done: device_pm_remove(dev); dpm_sysfs_remove(dev); DPMError: - dev->driver = NULL; + device_set_driver(dev, NULL); bus_remove_device(dev); BusError: device_remove_attrs(dev); --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -550,7 +550,7 @@ static void device_unbind_cleanup(struct arch_teardown_dma_ops(dev); kfree(dev->dma_range_map); dev->dma_range_map = NULL; - dev->driver = NULL; + device_set_driver(dev, NULL); dev_set_drvdata(dev, NULL); if (dev->pm_domain && dev->pm_domain->dismiss) dev->pm_domain->dismiss(dev); @@ -629,7 +629,7 @@ static int really_probe(struct device *d }
re_probe: - dev->driver = drv; + device_set_driver(dev, drv);
/* If using pinctrl, bind pins now before probing */ ret = pinctrl_bind_pins(dev); @@ -1014,7 +1014,7 @@ static int __device_attach(struct device if (ret == 0) ret = 1; else { - dev->driver = NULL; + device_set_driver(dev, NULL); ret = 0; } } else {