Qt串口读取问题

我用的是ARM9的板子
使用Qt4.5.3
我做了个界面，读取串口数据，并将数据显示界面上，今天突然出现了一些警告，数据无法显示到界面上，求大哥大姐帮忙看看，这是怎么回事。
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WARNING: at arch/arm/plat-s3c24xx/gpio.c:45 s3c2410_gpio_pullup+0x1c/0x4c()
Modules linked in:
[<c0032934>] (unwind_backtrace+0x0/0xec) from [<c003fd9c>] (warn_slowpath_common
+0x48/0x60)
[<c003fd9c>] (warn_slowpath_common+0x48/0x60) from [<c003fdcc>] (warn_slowpath_n
ull+0x18/0x1c)
[<c003fdcc>] (warn_slowpath_null+0x18/0x1c) from [<c003700c>] (s3c2410_gpio_pull
up+0x1c/0x4c)
[<c003700c>] (s3c2410_gpio_pullup+0x1c/0x4c) from [<c01cd7a8>] (s3c24xx_serial_s
tartup+0xdc/0xf0)
[<c01cd7a8>] (s3c24xx_serial_startup+0xdc/0xf0) from [<c01cb83c>] (uart_startup+
0x84/0x190)
[<c01cb83c>] (uart_startup+0x84/0x190) from [<c01cc6f0>] (uart_open+0x144/0x184)

[<c01cc6f0>] (uart_open+0x144/0x184) from [<c01b7b24>] (tty_open+0x310/0x448)
[<c01b7b24>] (tty_open+0x310/0x448) from [<c009bb60>] (chrdev_open+0x128/0x144)
[<c009bb60>] (chrdev_open+0x128/0x144) from [<c0097b40>] (__dentry_open+0x140/0x
244)
[<c0097b40>] (__dentry_open+0x140/0x244) from [<c0097d0c>] (nameidata_to_filp+0x
50/0x5c)
[<c0097d0c>] (nameidata_to_filp+0x50/0x5c) from [<c00a2b14>] (finish_open+0x90/0
x17c)
[<c00a2b14>] (finish_open+0x90/0x17c) from [<c00a4844>] (do_filp_open+0x120/0x4f
0)
[<c00a4844>] (do_filp_open+0x120/0x4f0) from [<c0097948>] (do_sys_open+0x58/0xe4
)
[<c0097948>] (do_sys_open+0x58/0xe4) from [<c002df60>] (ret_fast_syscall+0x0/0x2
c)
---[ end trace 36ccbae49057d3c1 ]---

http://www.armbbs.net/forum.php?mod=viewthread&tid=9731