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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-01 14:07:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-03 15:16:54 +0200 |
| commit | d69d804845985c29ab5be5a4b3b1f4787893daf8 (patch) | |
| tree | da2a783fd130da553c526692669eb847972b86d4 /drivers/hwtracing | |
| 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/hwtracing')
| -rw-r--r-- | drivers/hwtracing/intel_th/core.c | 4 | ||||
| -rw-r--r-- | drivers/hwtracing/intel_th/intel_th.h | 2 |
2 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index a121dc5cbd61..d72993355473 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -26,9 +26,9 @@ module_param(host_mode, bool, 0444); static DEFINE_IDA(intel_th_ida); -static int intel_th_match(struct device *dev, struct device_driver *driver) +static int intel_th_match(struct device *dev, const struct device_driver *driver) { - struct intel_th_driver *thdrv = to_intel_th_driver(driver); + const struct intel_th_driver *thdrv = to_intel_th_driver(driver); struct intel_th_device *thdev = to_intel_th_device(dev); if (thdev->type == INTEL_TH_SWITCH && diff --git a/drivers/hwtracing/intel_th/intel_th.h b/drivers/hwtracing/intel_th/intel_th.h index 6cbba733f259..3b87cd542c1b 100644 --- a/drivers/hwtracing/intel_th/intel_th.h +++ b/drivers/hwtracing/intel_th/intel_th.h @@ -189,7 +189,7 @@ struct intel_th_driver { }; #define to_intel_th_driver(_d) \ - container_of((_d), struct intel_th_driver, driver) + container_of_const((_d), struct intel_th_driver, driver) #define to_intel_th_driver_or_null(_d) \ ((_d) ? to_intel_th_driver(_d) : NULL) |