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Date: Wed, 16 Apr 2014 16:46:32 +0200
From: Stanislav Meduna <stano@meduna.org>
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Subject: w1-gpio: sleeping function called from invalid context
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Hi,

trying 1-wire with rt-patched Linux 3.12.15-rt25+ and lock debugging:

[   12.055550] BUG: sleeping function called from invalid context at /home/stano/Kernels/linux-3.12-rt/kernel/rtmutex.c:673
[   12.055573] in_atomic(): 0, irqs_disabled(): 128, pid: 92, name: w1_bus_master1
[   12.055588] 2 locks held by w1_bus_master1/92:
[   12.055675]  #0:  (&dev->mutex){+.+...}, at: [<c0233560>] w1_process+0xbc/0xe0
[   12.055729]  #1:  (&dev->bus_mutex){+.+...}, at: [<c0232a50>] w1_search+0x78/0x1e8
[   12.055741] irq event stamp: 374
[   12.055787] hardirqs last  enabled at (373): [<c02e04cc>] _raw_spin_unlock_irqrestore+0x6c/0x74
[   12.055815] hardirqs last disabled at (374): [<c0234598>] w1_touch_bit+0x50/0xc4
[   12.055860] softirqs last  enabled at (0): [<c001bacc>] copy_process+0x37c/0x1178
[   12.055876] softirqs last disabled at (0): [<  (null)>]   (null)
[   12.055899] CPU: 0 PID: 92 Comm: w1_bus_master1 Not tainted 3.12.15-rt25+ #66
[   12.055973] [<c00151bc>] (unwind_backtrace+0x0/0xf4) from [<c0012c00>] (show_stack+0x10/0x14)
[   12.056020] [<c0012c00>] (show_stack+0x10/0x14) from [<c02df920>] (rt_spin_lock+0x20/0x60)
[   12.056080] [<c02df920>] (rt_spin_lock+0x20/0x60) from [<c01bc98c>] (gpiod_direction_output+0x50/0x2fc)
[   12.056122] [<c01bc98c>] (gpiod_direction_output+0x50/0x2fc) from [<c02345ac>] (w1_touch_bit+0x64/0xc4)
[   12.056156] [<c02345ac>] (w1_touch_bit+0x64/0xc4) from [<c0234794>] (w1_write_8+0x54/0x7c)
[   12.056196] [<c0234794>] (w1_write_8+0x54/0x7c) from [<c0232a78>] (w1_search+0xa0/0x1e8)
[   12.056239] [<c0232a78>] (w1_search+0xa0/0x1e8) from [<c0233414>] (w1_search_process_cb+0x50/0xe0)
[   12.056280] [<c0233414>] (w1_search_process_cb+0x50/0xe0) from [<c0233570>] (w1_process+0xcc/0xe0)
[   12.056334] [<c0233570>] (w1_process+0xcc/0xe0) from [<c003cf24>] (kthread+0xa0/0xa8)
[   12.056379] [<c003cf24>] (kthread+0xa0/0xa8) from [<c000f3e0>] (ret_from_fork+0x14/0x34)

This happens reproducibly on any access.

Please Cc: me when replying

Thanks
-- 
                                                 Stano
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