fix-glamo-irq-recursive-locking.patch

Running heavily instrumented kernel, get report about glamo IRQ spinlock
probem.

[    8.795000] =============================================
[    8.795000] [ INFO: possible recursive locking detected ]
[    8.795000] 2.6.24 #782
[    8.795000] ---------------------------------------------
[    8.795000] swapper/1 is trying to acquire lock:
[    8.795000]  (&irq_desc_lock_class){++..}, at: [<c0077ae4>] handle_level_irq+0x24/0x120
[    8.795000]
[    8.795000] but task is already holding lock:
[    8.795000]  (&irq_desc_lock_class){++..}, at: [<c01be628>] glamo_irq_demux_handler+0x24/0x140
[    8.795000]
[    8.795000] other info that might help us debug this:
[    8.795000] 1 lock held by swapper/1:
[    8.795000]  #0:  (&irq_desc_lock_class){++..}, at: [<c01be628>] glamo_irq_demux_handler+0x24/0x140
[    8.795000]
[    8.795000] stack backtrace:
[    8.795000] [<c002ec28>] (dump_stack+0x0/0x14) from [<c006ad74>] (__lock_acquire+0x9a0/0xdec)
[    8.795000] [<c006a3d4>] (__lock_acquire+0x0/0xdec) from [<c006b264>] (lock_acquire+0xa4/0xc0)
[    8.795000] [<c006b1c0>] (lock_acquire+0x0/0xc0) from [<c02f7878>] (_spin_lock+0x44/0x78)
[    8.795000] [<c02f7834>] (_spin_lock+0x0/0x78) from [<c0077ae4>] (handle_level_irq+0x24/0x120)
[    8.795000]  r6:c03e11c0 r5:0000005c r4:c03e11c0
[    8.795000] [<c0077ac0>] (handle_level_irq+0x0/0x120) from [<c01be708>] (glamo_irq_demux_handler+0x104/0x140)
[    8.795000]  r7:00000038 r6:c03e11c0 r5:00000008 r4:c03e0560
[    8.795000] [<c01be604>] (glamo_irq_demux_handler+0x0/0x140) from [<c003c934>] (s3c_irq_demux_extint8+0x94/0xa4)
[    8.795000]  r8:00000002 r7:00000003 r6:00000000 r5:c03df958 r4:00000000
[    8.795000] [<c003c8a0>] (s3c_irq_demux_extint8+0x0/0xa4) from [<c0029048>] (__exception_text_start+0x48/0x64)
[    8.795000]  r4:00000015
[    8.795000] [<c0029000>] (__exception_text_start+0x0/0x64) from [<c0029a5c>] (__irq_svc+0x3c/0xb4)

Patch removes desc->lock locking around glamo_irq_demux_handler... guess it is OK
since we didn't clear interrupt source, can't recurse?

Signed-off-by: Andy Green <andy@openmoko.com>

0 files changed, 0 insertions, 0 deletions