irqchip/renesas-irqc: Use a separate lockdep class
The renesas-irqc interrupt controller is cascaded to the GIC. Hence when
propagating wake-up settings to its parent interrupt controller, the
following lockdep warning is printed:
=============================================
[ INFO: possible recursive locking detected ]
4.2.0-ape6evm-10725-g50fcd7643c034198 #280 Not tainted
---------------------------------------------
s2ram/1072 is trying to acquire lock:
(&irq_desc_lock_class){-.-...}, at: [<
c008d3fc>] __irq_get_desc_lock+0x58/0x98
but task is already holding lock:
(&irq_desc_lock_class){-.-...}, at: [<
c008d3fc>] __irq_get_desc_lock+0x58/0x98
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&irq_desc_lock_class);
lock(&irq_desc_lock_class);
*** DEADLOCK ***
May be due to missing lock nesting notation
6 locks held by s2ram/1072:
#0: (sb_writers#7){.+.+.+}, at: [<
c012eb14>] __sb_start_write+0xa0/0xa8
#1: (&of->mutex){+.+.+.}, at: [<
c019396c>] kernfs_fop_write+0x4c/0x1bc
#2: (s_active#24){.+.+.+}, at: [<
c0193974>] kernfs_fop_write+0x54/0x1bc
#3: (pm_mutex){+.+.+.}, at: [<
c008213c>] pm_suspend+0x10c/0x510
#4: (&dev->mutex){......}, at: [<
c02af3c4>] __device_suspend+0xdc/0x2cc
#5: (&irq_desc_lock_class){-.-...}, at: [<
c008d3fc>] __irq_get_desc_lock+0x58/0x98
stack backtrace:
CPU: 0 PID: 1072 Comm: s2ram Not tainted
4.2.0-ape6evm-10725-g50fcd7643c034198 #280
Hardware name: Generic R8A73A4 (Flattened Device Tree)
[<
c0018078>] (unwind_backtrace) from [<
c00144f0>] (show_stack+0x10/0x14)
[<
c00144f0>] (show_stack) from [<
c0451f14>] (dump_stack+0x88/0x98)
[<
c0451f14>] (dump_stack) from [<
c007b29c>] (__lock_acquire+0x15cc/0x20e4)
[<
c007b29c>] (__lock_acquire) from [<
c007c6e0>] (lock_acquire+0xac/0x12c)
[<
c007c6e0>] (lock_acquire) from [<
c0457c00>] (_raw_spin_lock_irqsave+0x40/0x54)
[<
c0457c00>] (_raw_spin_lock_irqsave) from [<
c008d3fc>] (__irq_get_desc_lock+0x58/0x98)
[<
c008d3fc>] (__irq_get_desc_lock) from [<
c008ebbc>] (irq_set_irq_wake+0x20/0xf8)
[<
c008ebbc>] (irq_set_irq_wake) from [<
c0260770>] (irqc_irq_set_wake+0x20/0x4c)
[<
c0260770>] (irqc_irq_set_wake) from [<
c008ec28>] (irq_set_irq_wake+0x8c/0xf8)
[<
c008ec28>] (irq_set_irq_wake) from [<
c02cb8c0>] (gpio_keys_suspend+0x74/0xc0)
[<
c02cb8c0>] (gpio_keys_suspend) from [<
c02ae8cc>] (dpm_run_callback+0x54/0x124)
Avoid this false positive by using a separate lockdep class for IRQC
interrupts.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1441798974-25716-2-git-send-email-geert%2Brenesas@glider.be
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>