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andy-shev / linux

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unloading SDIO kernel module #19

Closed farfromrefug closed 5 years ago

farfromrefug commented 6 years ago

Recently i stumble upon the issue where some Edison GPIOs where could not write on them because they were reserved for the SD: https://communities.intel.com/thread/77677

I know i can compile a kernel without that module. But i would prefer to be able to unload /load it at runtime. I don't enought about kernels to actually know where to look to see if this kernel allows this. Can you guide me?

Thanks

andy-shev commented 6 years ago

So, the kernel allows user to unload module (means that all devices will be gone which are supported by the driver in question) if there is no active user (of any of them), or unbind certain device from the driver — condition is the same, no active user of it. There is a good article to start with if you are interested in the latter mechanism https://lwn.net/Articles/143397/

andy-shev commented 5 years ago

@farfromrefug, is everything clarified?

farfromrefug commented 5 years ago

@andy-shev thanks yes it s clear now

andy-shev commented 5 years ago

Closed based on comment from @farfromrefug.