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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2024-07-01 14:07:37 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2024-07-03 15:16:54 +0200
commitd69d804845985c29ab5be5a4b3b1f4787893daf8 (patch)
treeda2a783fd130da553c526692669eb847972b86d4 /drivers/gpio
parentMAINTAINERS: add Rust device abstractions to DRIVER CORE (diff)
downloadlinux-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/gpio')
-rw-r--r--drivers/gpio/gpiolib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index fa62367ee929..8c1c7cd365c7 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -53,7 +53,7 @@ static DEFINE_IDA(gpio_ida);
static dev_t gpio_devt;
#define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */
-static int gpio_bus_match(struct device *dev, struct device_driver *drv)
+static int gpio_bus_match(struct device *dev, const struct device_driver *drv)
{
struct fwnode_handle *fwnode = dev_fwnode(dev);