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Date: Mon, 15 Apr 2024 10:56:24 +0200
From: Johan Hovold <johan@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/52] USB: serial: store owner from modules with
 usb_serial_register_drivers()
Message-ID: <ZhzruFpJPfORWqYv@hovoldconsulting.com>
References: <20240328-module-owner-usb-serial-v1-0-bc46c9ffbf56@linaro.org>
 <20240328-module-owner-usb-serial-v1-1-bc46c9ffbf56@linaro.org>
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In-Reply-To: <20240328-module-owner-usb-serial-v1-1-bc46c9ffbf56@linaro.org>

On Thu, Mar 28, 2024 at 11:05:39PM +0100, Krzysztof Kozlowski wrote:
> Modules registering driver with usb_serial_register_drivers() might
> forget to set .owner field.  The field is used by some of other kernel
> parts for reference counting (try_module_get()), so it is expected that
> drivers will set it.
> 
> Solve the problem by moving this task away from the drivers to the core
> amba bus code, just like we did for platform_driver in

"amba"

> commit 9447057eaff8 ("platform_device: use a macro instead of
> platform_driver_register").
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> ---
>  drivers/usb/serial/usb-serial.c | 12 +++++++-----
>  include/linux/usb/serial.h      |  7 +++++--
>  2 files changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
> index f1e91eb7f8a4..a659f2096a1a 100644
> --- a/drivers/usb/serial/usb-serial.c
> +++ b/drivers/usb/serial/usb-serial.c
> @@ -1459,17 +1459,18 @@ static void usb_serial_deregister(struct usb_serial_driver *device)
>  }
>  
>  /**
> - * usb_serial_register_drivers - register drivers for a usb-serial module
> + * __usb_serial_register_drivers - register drivers for a usb-serial module
>   * @serial_drivers: NULL-terminated array of pointers to drivers to be registered
> + * @owner: owning module/driver

Just "module"

>   * @name: name of the usb_driver for this set of @serial_drivers
>   * @id_table: list of all devices this @serial_drivers set binds to
>   *
>   * Registers all the drivers in the @serial_drivers array, and dynamically
>   * creates a struct usb_driver with the name @name and id_table of @id_table.
>   */
> -int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
> -				const char *name,
> -				const struct usb_device_id *id_table)
> +int __usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
> +				  struct module *owner, const char *name,
> +				  const struct usb_device_id *id_table)

Johan