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SubjectRe: [PATCH] mei: make mei_class a static const structure
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On 8/11/23 23:40, Greg KH wrote:
> On Thu, Aug 10, 2023 at 11:46:52PM +0400, Ivan Orlov wrote:
>> Now that the driver core allows for struct class to be in read-only
>> memory, move the mei_class structure to be declared at build time
>> placing it into read-only memory, instead of having to be dynamically
>> allocated at boot time.
>>
>> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
>> ---
>> drivers/misc/mei/main.c | 19 ++++++++++---------
>> 1 file changed, 10 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
>> index 51876da3fd65..902789d3106b 100644
>> --- a/drivers/misc/mei/main.c
>> +++ b/drivers/misc/mei/main.c
>> @@ -27,7 +27,9 @@
>> #include "mei_dev.h"
>> #include "client.h"
>>
>> -static struct class *mei_class;
>> +static const struct class mei_class = {
>> + .name = "mei",
>> +};
>> static dev_t mei_devt;
>
> Extra line after the new structure?
>
>> #define MEI_MAX_DEVS MINORMASK
>> static DEFINE_MUTEX(mei_minor_lock);
>> @@ -1115,7 +1117,7 @@ void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state)
>>
>> dev->dev_state = state;
>>
>> - clsdev = class_find_device_by_devt(mei_class, dev->cdev.dev);
>> + clsdev = class_find_device_by_devt(&mei_class, dev->cdev.dev);
>> if (clsdev) {
>> sysfs_notify(&clsdev->kobj, NULL, "dev_state");
>> put_device(clsdev);
>> @@ -1232,7 +1234,7 @@ int mei_register(struct mei_device *dev, struct device *parent)
>> goto err_dev_add;
>> }
>>
>> - clsdev = device_create_with_groups(mei_class, parent, devno,
>> + clsdev = device_create_with_groups(&mei_class, parent, devno,
>> dev, mei_groups,
>> "mei%d", dev->minor);
>>
>> @@ -1264,7 +1266,7 @@ void mei_deregister(struct mei_device *dev)
>>
>> mei_dbgfs_deregister(dev);
>>
>> - device_destroy(mei_class, devno);
>> + device_destroy(&mei_class, devno);
>>
>> mei_minor_free(dev);
>> }
>> @@ -1274,10 +1276,9 @@ static int __init mei_init(void)
>> {
>> int ret;
>>
>> - mei_class = class_create("mei");
>> - if (IS_ERR(mei_class)) {
>> + ret = class_register(&mei_class);
>> + if (ret) {
>> pr_err("couldn't create class\n");
>
> This message doesn't make sense anymore. No need for it either, just
> remove it and do a simple:
> return err;
> here instead.
>
> thanks,
>
> greg k-h


Hi Greg,

Thank you for the review, I'll make the suggested changes and send you
the V2.

--
Kind regards,
Ivan Orlov

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