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USB: gadget: f_hid: make hidg_class a static const structure

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Now that the driver core allows for struct class to be in read-only
memory, move the hidg_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at load time.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Link: https://lore.kernel.org/r/20230620094412.508580-11-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ivan Orlov 2023-06-20 11:44:17 +02:00 committed by Greg Kroah-Hartman
parent 2c10e7a049
commit 99f2d956e1
1 changed files with 10 additions and 11 deletions
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21
drivers/usb/gadget/function/f_hid.c
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@ -23,7 +23,11 @@
#define HIDG_MINORS 4
static int major, minors;
static struct class *hidg_class;
static const struct class hidg_class = {
.name = "hidg",
};
static DEFINE_IDA(hidg_ida);
static DEFINE_MUTEX(hidg_ida_lock); /* protects access to hidg_ida */
@ -1272,7 +1276,7 @@ static struct usb_function *hidg_alloc(struct usb_function_instance *fi)
device_initialize(&hidg->dev);
hidg->dev.release = hidg_release;
hidg->dev.class = hidg_class;
hidg->dev.class = &hidg_class;
hidg->dev.devt = MKDEV(major, opts->minor);
ret = dev_set_name(&hidg->dev, "hidg%d", opts->minor);
if (ret)
@ -1325,17 +1329,13 @@ int ghid_setup(struct usb_gadget *g, int count)
int status;
dev_t dev;
hidg_class = class_create("hidg");
if (IS_ERR(hidg_class)) {
status = PTR_ERR(hidg_class);
hidg_class = NULL;
status = class_register(&hidg_class);
if (status)
return status;
}
status = alloc_chrdev_region(&dev, 0, count, "hidg");
if (status) {
class_destroy(hidg_class);
hidg_class = NULL;
class_unregister(&hidg_class);
return status;
}
@ -1352,6 +1352,5 @@ void ghid_cleanup(void)
major = minors = 0;
}
class_destroy(hidg_class);
hidg_class = NULL;
class_unregister(&hidg_class);
}