Once you have an initialized kref, you must follow the following: rules: 1) If you make a non-temporary copy of a pointer, especially if: it can be passed to another thread of execution, you must: increment the refcount with krefget() before passing it off: krefget(&data. A kref_get is done for each device registered. krefinit(&data->refcount) This sets the refcount in the kref to 1. * class_device is released, the coresponding kref_put is done in the release A kref_get is done for each class_device registered. * Each device has a kref, which is initialized to 1 when the device is Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders. +++ -41,12 +41,12 the definition of dma_event_callback in dmaengine.h. When the channel is freed, the coresponding krefput happens. It will also cover a few directions that these structures might be taking in the future. It will cover why they were created, how to use them, and how the internals work. Every time one of the device's channels is allocated to a client, a krefget occurs. This paper will describe the current kobject and kref kernel structures in detail. Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries. When the + device is released, the coresponding krefput is done in the release method. Part of the work to eliminate struct class_device.Ärivers/dma/dmaengine.c | 43 ++++++++++++++++++++++-Ä¢ files changed, 24 insertions(+), 22 deletions(-) A krefget is done for each device registered. To avoid impact on non-refcounting code, this patch only adds a mitigation to struct kref, not to atomict. The inline code in PaX is likely much smaller. include include . If CONFIGHARDENKREFBIGMEM is enabled, its krefsub() implementation always has to do an additional READONCE() on the reference count, which might cause slowdowns.Messages sorted by: Ĭontent-Disposition: inline filename=dma.patchĬonvert from class_device to device for drivers/dma/dmaengine. USB driver crashes Linux kernel when receiving bigger amounts of data.Next in thread: Tony Jones: "Re: Convert from class_device to device for DMA engine".In reply to: Tony Jones: "Re: Convert from class_device to device for IDE/ide-tape". Previous message: tonyj: " Convert from class_device to device for IDE/ide-tape".Next message: tonyj: " Convert from class_device to device for SPI".Next made the refcount 2.Linux-Kernel Archive: Convert from class_device to device for DMA engine Convert from class_device to device for DMA engine From: tonyj And its pretty small: int krefput(struct kref kref. In my_data_handler(), kref_init() already put 1 to refcount, and kref_get() From: Al Viro <> Newsgroups: fa.linux.kernel Subject: Re: Top 10 kernel.Part of the first example in the document is attached below. The document is /Documentation/kerf.txt, and I'm referring to v3.12:
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