Bjoern A. Zeeb 5668c22a13 LinuxKPI/lindebugfs: stop panicing in lindebugfs, fix simple_read_from_buffer ... Trying to use lindebugfs for debugging wirless drivers two issues became apparent: (a) a panic in lindebugfs calling a hard coded release function if the caller had not provided one. This seems to be based on assumptions that no longer hold up. Remove the hard coded release function to prevent panics. (b) In LinuxKPI simple_read_from_buffer() would call copy_to_user() but buffers weren't setup for this (lindebugfs copies data from its own buffer) and then pseudofs will do another copyout to the user on this; remove the copy_to_user() and simply copy the data over to the provided buffer; this works for as long as the only consumers remain debugfs callers (which currently seems to be the case). [the only out-of-tree consumers I am aware off are two drm-kmod drivers/gpu/drm/amd/pm/* debugfs functions I cannot test]. Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Tested by: jfree Differential Revision: https://reviews.freebsd.org/D45755		2024-07-26 10:53:55 +00:00
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lindebugfs.c	LinuxKPI/lindebugfs: stop panicing in lindebugfs, fix simple_read_from_buffer	2024-07-26 10:53:55 +00:00