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Tsirkin" , Jason Wang , Xuan Zhuo , Richard Weinberger , Anton Ivanov , Johannes Berg , Paolo Bonzini , Stefan Hajnoczi , Jens Axboe , Marcel Holtmann , Luiz Augusto von Dentz , Olivia Mackall , Herbert Xu , Amit Shah , Arnd Bergmann , Greg Kroah-Hartman , Gonglei , "David S. Miller" , Viresh Kumar , Linus Walleij , Bartosz Golaszewski , David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Jean-Philippe Brucker , Joerg Roedel , Alexander Graf , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , Stefano Garzarella , Kalle Valo , Dan Williams , Vishal Verma , Dave Jiang , Ira Weiny , Pankaj Gupta , Bjorn Andersson , Mathieu Poirier , "Martin K. Petersen" , Vivek Goyal , Miklos Szeredi , Anton Yakovlev , Jaroslav Kysela , Takashi Iwai Cc: virtualization@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-um@lists.infradead.org, linux-block@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, dri-devel@lists.freedesktop.org, iommu@lists.linux.dev, netdev@vger.kernel.org, v9fs@lists.linux.dev, kvm@vger.kernel.org, linux-wireless@vger.kernel.org, nvdimm@lists.linux.dev, linux-remoteproc@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, alsa-devel@alsa-project.org, linux-sound@vger.kernel.org, Krzysztof Kozlowski X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3444; i=krzysztof.kozlowski@linaro.org; h=from:subject:message-id; bh=fwrJWKj8nU797mE0IC4lY3eH4qtf6HIC5ncnQg0kcy4=; b=owEBbQKS/ZANAwAKAcE3ZuaGi4PXAcsmYgBmBBPaF1JDzqTfV6cOXqJmyzXYsgEqPQATvYRQk WnQRf8t/LyJAjMEAAEKAB0WIQTd0mIoPREbIztuuKjBN2bmhouD1wUCZgQT2gAKCRDBN2bmhouD 1+oYD/42/c31q0OYiLqEi/06F54yokibXBcPIkZLpMFNOTFEC7z+HyQLH1rUQjhhXMgwJ7AzI8y 7NznQsKuUd6y2WCWJnFhBDts6kEHJvQU6E+xqGzP2vmAVnMROlQy/LkXQIRLZafz1m+V1KtGAHU DUddrXGe58/IULO6HGJXn5W88W87cHRhL+VzuPgLPSZ1r+2UgOJJPsXQHGSCBwzazewyJCPdVBL aVAs5/3SwH4JaBj0a2yWWmqghkUrpKThxS1Z9qlZ31JkNUvyUPD1Uw24FMkTdQgdD9gkACGcwn4 EFpICaVxRC2a10UH4qf9NSqNkAU3FdzajlC/nA75p3AAU7+TsrHZzPNv/qF1IHIoP/W6eB/UKI7 3U4PWq1LIDq7UYmL9tMxbveghvTTu67p90AA2uJrI2tE9ZZq6zFMijWlDvHb+SS5hXLXuAj/oOg claga2VkfoNDU2HP3F4to11EblvFhdSfJJDnLzKLBnrbjnVM7dkqY3GavOlIslOcd2ZW8gHDi+Z bsYIHCHPTvSdrW+Rf96zy3s822rN2dtNm9bxU769KmiWXmCytk48eZlxVoITtSNZAoGPTmM7i3N Qk0Y5SRvJ/PnycrTHfKDykbvzTENDEK7+rErnq6incSGSqzmmVreGoc0RhcyC/e4specV3/cM1K s9oa3DKTSHa4YBA== X-Developer-Key: i=krzysztof.kozlowski@linaro.org; a=openpgp; fpr=9BD07E0E0C51F8D59677B7541B93437D3B41629B Modules registering driver with register_virtio_driver() might forget to set .owner field. i2c-virtio.c for example has it missing. 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 commit 9447057eaff8 ("platform_device: use a macro instead of platform_driver_register"). Signed-off-by: Krzysztof Kozlowski --- Documentation/driver-api/virtio/writing_virtio_drivers.rst | 1 - drivers/virtio/virtio.c | 6 ++++-- include/linux/virtio.h | 7 +++++-- 3 files changed, 9 insertions(+), 5 deletions(-) diff --git a/Documentation/driver-api/virtio/writing_virtio_drivers.rst b/Documentation/driver-api/virtio/writing_virtio_drivers.rst index e14c58796d25..e5de6f5d061a 100644 --- a/Documentation/driver-api/virtio/writing_virtio_drivers.rst +++ b/Documentation/driver-api/virtio/writing_virtio_drivers.rst @@ -97,7 +97,6 @@ like this:: static struct virtio_driver virtio_dummy_driver = { .driver.name = KBUILD_MODNAME, - .driver.owner = THIS_MODULE, .id_table = id_table, .probe = virtio_dummy_probe, .remove = virtio_dummy_remove, diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index f173587893cb..9510c551dce8 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -362,14 +362,16 @@ static const struct bus_type virtio_bus = { .remove = virtio_dev_remove, }; -int register_virtio_driver(struct virtio_driver *driver) +int __register_virtio_driver(struct virtio_driver *driver, struct module *owner) { /* Catch this early. */ BUG_ON(driver->feature_table_size && !driver->feature_table); driver->driver.bus = &virtio_bus; + driver->driver.owner = owner; + return driver_register(&driver->driver); } -EXPORT_SYMBOL_GPL(register_virtio_driver); +EXPORT_SYMBOL_GPL(__register_virtio_driver); void unregister_virtio_driver(struct virtio_driver *driver) { diff --git a/include/linux/virtio.h b/include/linux/virtio.h index b0201747a263..26c4325aa373 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -170,7 +170,7 @@ size_t virtio_max_dma_size(const struct virtio_device *vdev); /** * struct virtio_driver - operations for a virtio I/O driver - * @driver: underlying device driver (populate name and owner). + * @driver: underlying device driver (populate name). * @id_table: the ids serviced by this driver. * @feature_table: an array of feature numbers supported by this driver. * @feature_table_size: number of entries in the feature table array. @@ -208,7 +208,10 @@ static inline struct virtio_driver *drv_to_virtio(struct device_driver *drv) return container_of(drv, struct virtio_driver, driver); } -int register_virtio_driver(struct virtio_driver *drv); +/* use a macro to avoid include chaining to get THIS_MODULE */ +#define register_virtio_driver(drv) \ + __register_virtio_driver(drv, THIS_MODULE) +int __register_virtio_driver(struct virtio_driver *drv, struct module *owner); void unregister_virtio_driver(struct virtio_driver *drv); /* module_virtio_driver() - Helper macro for drivers that don't do