#Gendisk Drivers drivers#
#Gendisk Drivers driver#
#Gendisk Drivers software#
#Gendisk Drivers license#

#Gendisk Drivers license#

Subject to the terms of this Agreement, Intel grants to You, for the Term, a limited, nonexclusive, nontransferable, revocable, worldwide, fully paid-up license under Intel’s intellectual property rights in the Materials, without the right to sublicense, to use the Materials in the development of Your Products, including modifying Materials delivered as source code, and distributing the Materials, including Your modifications, in object form, embedded in or for execution on Your Product and under terms and conditions consistent with Your rights and obligations under this Agreement. 1.5 “Your Products” means products developed or to be developed by or for You that include an Intel Component executing the Materials. 1.4 “You” or “Your” means you or you and your employer and its affiliates, whether or not capitalized.

#Gendisk Drivers software#

1.3 “Materials” means software or other collateral Intel delivers to You under this Agreement. 1.2 “Intel Components” means a hardware component or product designed, developed, sold, or distributed by Intel or its affiliates. 1.1 “Including” means including but not limited to, whether or not capitalized. If You do not agree, do not use the Materials and destroy all copies. By downloading, installing, or using the Materials, You agree to these terms. If You are accepting this Agreement on behalf of or in conjunction with Your work for Your employer, You represent and warrant that You have the authority to bind your employer to this Agreement. Other part of the kernel retains a reference to it.Intel OBL Distribution (Commercial Use) License This LIMITED DISTRIBUTION LICENSE AGREEMENT (“Agreement”) is a contract between You and Intel Corporation and its affiliates (“Intel”). That call will cause the gendisk structure to be freed, as long as no Must explicitly release it with: void put_disk(struct gendisk *disk) Your driver's reference to the gendisk object remains, though you After a call toĭel_gendisk(), no more operations will be sent to the given device. Given disk, and generally removes it from the system.

This function cleans up all of the information associated with the With: void del_gendisk(struct gendisk *disk) Should you need to remove a disk from the system, that is accomplished

#Gendisk Drivers driver#

The call to add_disk() increments the disk's reference count if the disk structure is ever to be released, the driver is responsibleįor decrementing that count (with put_disk()). If you are calling add_disk() in your driver initialization routine, you should not fail the initialization process after the Sufficiently initialized to handle requests. You should not call add_disk() until your driver is Keeping in mind about add_disk(): add_disk() can create I/O to the device (to read partition tables and such). Have to add it to the list of active disks that is done with: void add_disk(struct gendisk *disk) Īfter this call, your device is active. Manipulating gendisks Once you have your gendisk structure set up, you If I issue the command sudo rmmod mod.ko then the command gets killed by the system. Unregister_blkdev( dev.major, BLKDEVNAME ) Snprintf(dev.disk->disk_name, DISK_NAME_LEN, 'bd0' ) #include ĭev.major = register_blkdev( 0, BLKDEVNAME ) But since I don't call add_disk, there should be no reference's to that structure. This mechanism hinders you to unload the module, while it's being used. I know that the gendisk structure has an embedded kobject, which takes care of reference counting. I figured out, that in the module unload function, the call to del_gendisk caused the hanging. But if I want to unload it with rmmod, it hangs. All works fine, when inserting the module. I registered a block device with blkdev_register and allocated the gendisk structure with alloc_disk. This example is not complete and I take progress step by step.

#Gendisk Drivers drivers#

I'm writing a little example for block device drivers in Linux.