Staging: panel: fix spinlock trylock failure on UP

Staging: panel: fix spinlock trylock failure on UP

Use spin_lock_irq() to quiet warning:

         [    8.232324] BUG: spinlock trylock failure on UP on CPU#0, reboot/85
         [    8.234138]  lock: c161c760, .magic: dead4ead, .owner: reboot/85, .owner_cpu: 0
         [    8.236132] Pid: 85, comm: reboot Not tainted 3.4.0-rc7-00656-g82163ed #5
         [    8.237965] Call Trace:
         [    8.238648]  [<c13dfd20>] ? printk+0x18/0x1a
         [    8.239827]  [<c122a5e0>] spin_dump+0x80/0xd0
         [    8.241016]  [<c122a652>] spin_bug+0x22/0x30
         [    8.242181]  [<c122a93b>] do_raw_spin_trylock+0x5b/0x70
         [    8.243611]  [<c13e8bae>] _raw_spin_trylock+0xe/0x60
         [    8.244975]  [<c1392230>] ? keypad_send_key.constprop.9+0xe0/0xe0
 ==>     [    8.246638]  [<c13922ea>] panel_scan_timer+0xba/0x570
         [    8.248019]  [<c1392230>] ? keypad_send_key.constprop.9+0xe0/0xe0
         [    8.249689]  [<c102f6f5>] run_timer_softirq+0x1e5/0x370
         [    8.251191]  [<c102f645>] ? run_timer_softirq+0x135/0x370
         [    8.252718]  [<c1392230>] ? keypad_send_key.constprop.9+0xe0/0xe0
         [    8.254462]  [<c102a592>] __do_softirq+0xc2/0x1c0
         [    8.255758]  [<c102a4d0>] ? local_bh_enable_ip+0x130/0x130
         [    8.257228]  <IRQ>  [<c102a855>] ? irq_exit+0x65/0x70
         [    8.258647]  [<c1013ff9>] ? smp_apic_timer_interrupt+0x49/0x80
         [    8.260226]  [<c13e96c1>] ? apic_timer_interrupt+0x31/0x38
         [    8.261737]  [<c12700e0>] ? drm_vm_open_locked+0x70/0xb0
         [    8.263166]  [<c122489a>] ? delay_tsc+0x1a/0x30
         [    8.264452]  [<c12248c9>] ? __delay+0x9/0x10
         [    8.265621]  [<c12248ec>] ? __const_udelay+0x1c/0x20
 ==>     [    8.266967]  [<c139136c>] ? lcd_clear_fast_p8+0x9c/0xe0
         [    8.268386]  [<c1391a66>] ? lcd_write+0x226/0x810
         [    8.269653]  [<c1367900>] ? md_set_readonly+0xc0/0xc0
         [    8.271013]  [<c122a9ed>] ? do_raw_spin_unlock+0x9d/0xe0
         [    8.272470]  [<c1392a98>] ? panel_lcd_print+0x38/0x40
         [    8.273837]  [<c1392ace>] ? panel_notify_sys+0x2e/0x60
         [    8.275224]  [<c1046634>] ? notifier_call_chain+0x84/0xb0
         [    8.276754]  [<c10469ce>] ? __blocking_notifier_call_chain+0x3e/0x60
         [    8.278576]  [<c1046a0a>] ? blocking_notifier_call_chain+0x1a/0x20
         [    8.280267]  [<c1036a14>] ? kernel_restart_prepare+0x14/0x40
         [    8.281901]  [<c1036a8e>] ? kernel_restart+0xe/0x50
         [    8.283216]  [<c1036ce9>] ? sys_reboot+0x149/0x1e0
         [    8.284532]  [<c10b3fb3>] ? handle_pte_fault+0x93/0xd70
         [    8.285956]  [<c1019e35>] ? do_page_fault+0x215/0x5e0
         [    8.287330]  [<c101a113>] ? do_page_fault+0x4f3/0x5e0
         [    8.288704]  [<c1045ac6>] ? up_read+0x16/0x30
         [    8.289890]  [<c101a113>] ? do_page_fault+0x4f3/0x5e0
         [    8.291252]  [<c10d4486>] ? iterate_supers+0x86/0xd0
         [    8.292615]  [<c122a9ed>] ? do_raw_spin_unlock+0x9d/0xe0
         [    8.294049]  [<c13e8dcd>] ? _raw_spin_unlock+0x1d/0x20
         [    8.295449]  [<c10d44ab>] ? iterate_supers+0xab/0xd0
         [    8.296795]  [<c10fb620>] ? __sync_filesystem+0xa0/0xa0
         [    8.298199]  [<c13e9b03>] ? sysenter_do_call+0x12/0x37
         [    8.306899] Restarting system.
         [    8.307747] machine restart

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>