OMAP3: serial - fix bug introduced in 20100720-upstream
authorMika Westerberg <ext-mika.1.westerberg@nokia.com>
Mon, 14 Dec 2009 13:59:18 +0000 (13:59 +0000)
committerTony Lindgren <tony@atomide.com>
Wed, 16 Dec 2009 19:04:53 +0000 (11:04 -0800)
commit340cc2b922219239d585da55effca94d363648fa
tree20626afe31d278215f257cbbd15a6a2940e6d474
parent6292164d28ecb81251500b5f0fbec6cd1fae1f54
OMAP3: serial - fix bug introduced in

Commit f62349ee9788b1d94c55eb6c291d74a1f69bdd9e had side effect that
causes kernel to oops when we are suspending to ram:

# echo mem > /sys/power/state

WARNING: at kernel/irq/manage.c:858 __free_irq+0x90/0x174()
Trying to free already-free IRQ 72
Modules linked in:
Backtrace:
[<c00328d0>] (dump_backtrace+0x0/0x110) from [<c0347298>] (dump_stack+0x18/0x1c)
 r7:dfd4be08 r6:c009505c r5:c03fbfd1 r4:0000035a
[<c0347280>] (dump_stack+0x0/0x1c) from [<c005a408>] (warn_slowpath_common+0x50/0x68)
[<c005a3b8>] (warn_slowpath_common+0x0/0x68) from [<c005a46c>] (warn_slowpath_fmt+0x30)
 r7:c0474afc r6:00000048 r5:00000000 r4:c0474ac0
[<c005a43c>] (warn_slowpath_fmt+0x0/0x38) from [<c009505c>] (__free_irq+0x90/0x174)
 r3:00000048 r2:c03fc0ef
[<c0094fcc>] (__free_irq+0x0/0x174) from [<c0095184>] (free_irq+0x44/0x64)
[<c0095140>] (free_irq+0x0/0x64) from [<c0038100>] (omap_uart_enable_irqs+0x4c/0x90)
 r7:c034d58c r6:00000003 r5:00000000 r4:c0463028
[<c00380b4>] (omap_uart_enable_irqs+0x0/0x90) from [<c003d8f8>] (omap3_pm_begin+0x1c/0)
 r5:00000003 r4:00000000
[<c003d8dc>] (omap3_pm_begin+0x0/0x28) from [<c008d008>] (suspend_devices_and_enter+0x)
[<c008cfd8>] (suspend_devices_and_enter+0x0/0x1dc) from [<c008d29c>] (enter_state+0xe8)
 r5:c03f7f46 r4:00000000
[<c008d1b4>] (enter_state+0x0/0x140) from [<c008c8e0>] (state_store+0x9c/0xc4)
 r7:c034d58c r6:00000003 r5:00000003 r4:c03f7f46
[<c008c844>] (state_store+0x0/0xc4) from [<c01cb2dc>] (kobj_attr_store+0x20/0x24)
[<c01cb2bc>] (kobj_attr_store+0x0/0x24) from [<c0119420>] (sysfs_write_file+0x114/0x14)
[<c011930c>] (sysfs_write_file+0x0/0x148) from [<c00cb298>] (vfs_write+0xb8/0x164)
[<c00cb1e0>] (vfs_write+0x0/0x164) from [<c00cb408>] (sys_write+0x44/0x70)
 r8:4001f000 r7:00000004 r6:df81bd00 r5:00000000 r4:00000000
[<c00cb3c4>] (sys_write+0x0/0x70) from [<c002f040>] (ret_fast_syscall+0x0/0x38)
 r8:c002f204 r7:00000004 r6:401fa5e8 r5:4001f000 r4:00000004

This is due the fact that uart_list list was populated in
omap_serial_early_init() and omap_uart_enable_irqs() went through this
list even when serial idle wasn't enabled for all uarts.

This patch moves the code that populates the uart_list and enables uart
clocks into omap_serial_init_port().

Signed-off-by: Mika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
arch/arm/mach-omap2/serial.c