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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-01 15:07:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-03 16:16:54 +0300 |
| commit | d69d804845985c29ab5be5a4b3b1f4787893daf8 (patch) | |
| tree | da2a783fd130da553c526692669eb847972b86d4 /drivers/bus/mips_cdmm.c | |
| parent | 6b521fc111a2ad5ead39776960d3d2d289ce0722 (diff) | |
| download | linux-d69d804845985c29ab5be5a4b3b1f4787893daf8.tar.xz | |
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/bus/mips_cdmm.c')
| -rw-r--r-- | drivers/bus/mips_cdmm.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/bus/mips_cdmm.c b/drivers/bus/mips_cdmm.c index 8baf14bd5eff..12dd32fd0b62 100644 --- a/drivers/bus/mips_cdmm.c +++ b/drivers/bus/mips_cdmm.c @@ -37,7 +37,7 @@ /* Each block of device registers is 64 bytes */ #define CDMM_DRB_SIZE 64 -#define to_mips_cdmm_driver(d) container_of(d, struct mips_cdmm_driver, drv) +#define to_mips_cdmm_driver(d) container_of_const(d, struct mips_cdmm_driver, drv) /* Default physical base address */ static phys_addr_t mips_cdmm_default_base; @@ -59,10 +59,10 @@ mips_cdmm_lookup(const struct mips_cdmm_device_id *table, return ret ? table : NULL; } -static int mips_cdmm_match(struct device *dev, struct device_driver *drv) +static int mips_cdmm_match(struct device *dev, const struct device_driver *drv) { struct mips_cdmm_device *cdev = to_mips_cdmm_device(dev); - struct mips_cdmm_driver *cdrv = to_mips_cdmm_driver(drv); + const struct mips_cdmm_driver *cdrv = to_mips_cdmm_driver(drv); return mips_cdmm_lookup(cdrv->id_table, cdev) != NULL; } |