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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/hv | |
| 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/hv')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 12a707ab73f8..c857dc3975be 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -685,7 +685,7 @@ static const struct hv_vmbus_device_id vmbus_device_null; * Return a matching hv_vmbus_device_id pointer. * If there is no match, return NULL. */ -static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv, +static const struct hv_vmbus_device_id *hv_vmbus_get_id(const struct hv_driver *drv, struct hv_device *dev) { const guid_t *guid = &dev->dev_type; @@ -696,7 +696,7 @@ static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv, return NULL; /* Look at the dynamic ids first, before the static ones */ - id = hv_vmbus_dynid_match(drv, guid); + id = hv_vmbus_dynid_match((struct hv_driver *)drv, guid); if (!id) id = hv_vmbus_dev_match(drv->id_table, guid); @@ -809,9 +809,9 @@ ATTRIBUTE_GROUPS(vmbus_drv); /* * vmbus_match - Attempt to match the specified device to the specified driver */ -static int vmbus_match(struct device *device, struct device_driver *driver) +static int vmbus_match(struct device *device, const struct device_driver *driver) { - struct hv_driver *drv = drv_to_hv_drv(driver); + const struct hv_driver *drv = drv_to_hv_drv(driver); struct hv_device *hv_dev = device_to_hv_device(device); /* The hv_sock driver handles all hv_sock offers. */ |