diff options
author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-01 14:07:37 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-03 15:16:54 +0200 |
commit | d69d804845985c29ab5be5a4b3b1f4787893daf8 (patch) | |
tree | da2a783fd130da553c526692669eb847972b86d4 /drivers/base/base.h | |
parent | MAINTAINERS: add Rust device abstractions to DRIVER CORE (diff) | |
download | linux-d69d804845985c29ab5be5a4b3b1f4787893daf8.tar.xz linux-d69d804845985c29ab5be5a4b3b1f4787893daf8.zip |
driver core: have match() callback in struct bus_type take a const *
In the match() callback, the struct device_driver * should not be
changed, so change the function callback to be a const *. This is one
step of many towards making the driver core safe to have struct
device_driver in read-only memory.
Because the match() callback is in all busses, all busses are modified
to handle this properly. This does entail switching some container_of()
calls to container_of_const() to properly handle the constant *.
For some busses, like PCI and USB and HV, the const * is cast away in
the match callback as those busses do want to modify those structures at
this point in time (they have a local lock in the driver structure.)
That will have to be changed in the future if they wish to have their
struct device * in read-only-memory.
Cc: Rafael J. Wysocki <rafael@kernel.org>
Reviewed-by: Alex Elder <elder@kernel.org>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/base.h')
-rw-r--r-- | drivers/base/base.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/base/base.h b/drivers/base/base.h index 8bef47afa3a9..0886f555d782 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -164,8 +164,7 @@ void device_set_deferred_probe_reason(const struct device *dev, struct va_format static inline int driver_match_device(const struct device_driver *drv, struct device *dev) { - /* cast will be removed in the future when match can handle a const pointer properly. */ - return drv->bus->match ? drv->bus->match(dev, (struct device_driver *)drv) : 1; + return drv->bus->match ? drv->bus->match(dev, drv) : 1; } static inline void dev_sync_state(struct device *dev) |