On Fri, Feb 23, 2018 at 11:33:07PM +0100, Sebastian Andrzej Siewior wrote: > 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@xxxxxxx> > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Patch applied. Thanks. -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
