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I don't why we need take a single write lock and disable interrupts while setting up debugfs. This is what what happens when we try anyway: |ccp 0000:03:00.2: enabling device (0000 -> 0002) |BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:69 |in_atomic(): 1, irqs_disabled(): 1, pid: 3, name: kworker/0:0 |irq event stamp: 17150 |hardirqs last enabled at (17149): [<0000000097a18c49>] restore_regs_and_return_to_kernel+0x0/0x23 |hardirqs last disabled at (17150): [<000000000773b3a9>] _raw_write_lock_irqsave+0x1b/0x50 |softirqs last enabled at (17148): [<0000000064d56155>] __do_softirq+0x3b8/0x4c1 |softirqs last disabled at (17125): [<0000000092633c18>] irq_exit+0xb1/0xc0 |CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.16.0-rc2+ #30 |Workqueue: events work_for_cpu_fn |Call Trace: | dump_stack+0x7d/0xb6 | ___might_sleep+0x1eb/0x250 | down_write+0x17/0x60 | start_creating+0x4c/0xe0 | debugfs_create_dir+0x9/0x100 | ccp5_debugfs_setup+0x191/0x1b0 | ccp5_init+0x8a7/0x8c0 | ccp_dev_init+0xb8/0xe0 | sp_init+0x6c/0x90 | sp_pci_probe+0x26e/0x590 | local_pci_probe+0x3f/0x90 | work_for_cpu_fn+0x11/0x20 | process_one_work+0x1ff/0x650 | worker_thread+0x1d4/0x3a0 | kthread+0xfe/0x130 | ret_from_fork+0x27/0x50 If any locking is required, a simple mutex will do it. Cc: Gary R Hook <gary.hook@amd.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: Gary R Hook <gary.hook@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.