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[104.188.17.28]) by smtp.gmail.com with ESMTPSA id x11sm11535091pgq.48.2020.03.23.12.05.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Mar 2020 12:05:09 -0700 (PDT) Date: Mon, 23 Mar 2020 12:05:06 -0700 From: Bjorn Andersson To: Manivannan Sadhasivam Cc: gregkh@linuxfoundation.org, davem@davemloft.net, smohanad@codeaurora.org, jhugo@codeaurora.org, kvalo@codeaurora.org, hemantk@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/7] bus: mhi: core: Pass module owner during client driver registration Message-ID: <20200323190506.GB119913@minitux> References: <20200323122108.12851-1-manivannan.sadhasivam@linaro.org> <20200323122108.12851-2-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200323122108.12851-2-manivannan.sadhasivam@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon 23 Mar 05:21 PDT 2020, Manivannan Sadhasivam wrote: > The module owner field can be used to prevent the removal of kernel > modules when there are any device files associated with it opened in > userspace. Hence, modify the API to pass module owner field. For > convenience, module_mhi_driver() macro is used which takes care of > passing the module owner through THIS_MODULE of the module of the > driver and also avoiding the use of specifying the default MHI client > driver register/unregister routines. > > Suggested-by: Greg Kroah-Hartman > Signed-off-by: Manivannan Sadhasivam Reviewed-by: Bjorn Andersson > --- > drivers/bus/mhi/core/init.c | 5 +++-- > include/linux/mhi.h | 19 ++++++++++++++++++- > 2 files changed, 21 insertions(+), 3 deletions(-) > > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c > index 5fb756ca335e..eb7f556a8531 100644 > --- a/drivers/bus/mhi/core/init.c > +++ b/drivers/bus/mhi/core/init.c > @@ -1189,7 +1189,7 @@ static int mhi_driver_remove(struct device *dev) > return 0; > } > > -int mhi_driver_register(struct mhi_driver *mhi_drv) > +int __mhi_driver_register(struct mhi_driver *mhi_drv, struct module *owner) > { > struct device_driver *driver = &mhi_drv->driver; > > @@ -1197,12 +1197,13 @@ int mhi_driver_register(struct mhi_driver *mhi_drv) > return -EINVAL; > > driver->bus = &mhi_bus_type; > + driver->owner = owner; > driver->probe = mhi_driver_probe; > driver->remove = mhi_driver_remove; > > return driver_register(driver); > } > -EXPORT_SYMBOL_GPL(mhi_driver_register); > +EXPORT_SYMBOL_GPL(__mhi_driver_register); > > void mhi_driver_unregister(struct mhi_driver *mhi_drv) > { > diff --git a/include/linux/mhi.h b/include/linux/mhi.h > index 79cb9f898544..0e7071dbf2c3 100644 > --- a/include/linux/mhi.h > +++ b/include/linux/mhi.h > @@ -514,11 +514,28 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, > */ > void mhi_unregister_controller(struct mhi_controller *mhi_cntrl); > > +/* > + * module_mhi_driver() - Helper macro for drivers that don't do > + * anything special in module init/exit. This eliminates a lot of > + * boilerplate. Each module may only use this macro once, and > + * calling it replaces module_init() and module_exit() > + */ > +#define module_mhi_driver(mhi_drv) \ > + module_driver(mhi_drv, mhi_driver_register, \ > + mhi_driver_unregister) > + > +/* > + * Macro to avoid include chaining to get THIS_MODULE > + */ > +#define mhi_driver_register(mhi_drv) \ > + __mhi_driver_register(mhi_drv, THIS_MODULE) > + > /** > * mhi_driver_register - Register driver with MHI framework > * @mhi_drv: Driver associated with the device > + * @owner: The module owner > */ > -int mhi_driver_register(struct mhi_driver *mhi_drv); > +int __mhi_driver_register(struct mhi_driver *mhi_drv, struct module *owner); > > /** > * mhi_driver_unregister - Unregister a driver for mhi_devices > -- > 2.17.1 >