谁能回答我这个问题？ 进入休眠时:~# echo mem > /sys/power/state
[ 334.976409] PM: Syncing filesystems ... done.
[ 337.727722] PM: Preparing system for mem sleep
[ 337.732879] am33xx_sr_cpufreq_transition: prechange
[ 337.738281] am33xx_sr_cpufreq_transition: postchange
[ 337.743530] am33xx_sr_cpufreq_transition: postchange, new opp=0
[ 337.826446] Freezing user space processes ... (elapsed 0.01 seconds) done.
[ 337.848754] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) do.
[ 337.868743] PM: Entering mem sleep
[ 337.872375] Suspending console(s) (use no_console_suspend to debug)
[ 337.892669] pm_op(): platform_pm_suspend+0x0/0x5c returns -16
[ 337.892700] PM: Device musb-hdrc.0 failed to suspend: error -16
[ 337.892730] PM: Some devices failed to suspend
[ 338.040557] net eth0: CPSW phy found : id is : 0x7c0f1
[ 338.043762] PM: resume of devices complete after 151.000 msecs
[ 338.072692] PM: Finishing wakeup.
[ 338.076202] Restarting tasks ... done.
[ 338.159088] am33xx_sr_cpufreq_transition: prechange
[ 338.164428] am33xx_sr_cpufreq_transition: postchange
[ 338.169647] am33xx_sr_cpufreq_transition: postchange, new opp=4
-sh: echo: write error: Device or resource busy
不知道怎么弄，求帮助！！谢谢
