pwm: to solve the bug :

pwm: to solve the bug :
[10:33:29:984]<4>[  127.237239] [<c07b5200>] (__mutex_lock_slowpath+0x1c0/0x22c) from [<c07b529c>] (mutex_lock+0x30/0x48)
[10:33:30:000]<4>[  127.237255] [<c07b529c>] (mutex_lock+0x30/0x48) from [<c057d32c>] (clk_prepare_lock+0x48/0xe0)
[10:33:30:015]<4>[  127.237269] [<c057d32c>] (clk_prepare_lock+0x48/0xe0) from [<c057eea4>] (clk_prepare+0xc/0x24)
[10:33:30:031]<4>[  127.237285] [<c057eea4>] (clk_prepare+0xc/0x24) from [<c0282df8>] (rk_pwm_config+0x20/0x74)
[10:33:30:031]<4>[  127.237300] [<c0282df8>] (rk_pwm_config+0x20/0x74) from [<c0281904>] (pwm_config+0x54/0x60)
[10:33:30:031]<4>[  127.237317] [<c0281904>] (pwm_config+0x54/0x60) from [<c02c0528>] (pwm_regulator_set_voltage+0xd0/0xf4)