From: Dongxiao Xu Date: Sun, 31 May 2009 06:43:39 +0000 (+0800) Subject: Staging: heci: fix wrong order of device_lock and file_lock X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=171df6381962b463e5aa8ff936eb3f995a56ce9e;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git Staging: heci: fix wrong order of device_lock and file_lock When the two locks are nested, the code should always first acquire file_lock, and then acquire device_lock in order not to generate dead-lock race. Signed-off-by: Dongxiao Xu Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/heci/io_heci.c b/drivers/staging/heci/io_heci.c index 619eeed87ea2..53dc770727d8 100644 --- a/drivers/staging/heci/io_heci.c +++ b/drivers/staging/heci/io_heci.c @@ -277,14 +277,16 @@ int heci_ioctl_connect_client(struct iamt_heci_device *dev, int if_num, } goto end; } + spin_unlock_bh(&dev->device_lock); + spin_lock(&file_ext->file_lock); + spin_lock_bh(&dev->device_lock); if (file_ext->state != HECI_FILE_CONNECTING) { rets = -ENODEV; - spin_unlock(&file_ext->file_lock); spin_unlock_bh(&dev->device_lock); + spin_unlock(&file_ext->file_lock); goto end; } - spin_unlock(&file_ext->file_lock); /* prepare the output buffer */ client = (struct heci_client *) res_msg.data; client->max_msg_length = dev->me_clients[i].props.max_msg_length; @@ -312,6 +314,7 @@ int heci_ioctl_connect_client(struct iamt_heci_device *dev, int if_num, &dev->ctrl_wr_list.heci_cb.cb_list); } spin_unlock_bh(&dev->device_lock); + spin_unlock(&file_ext->file_lock); err = wait_event_timeout(dev->wait_recvd_msg, (HECI_FILE_CONNECTED == file_ext->state || HECI_FILE_DISCONNECTED == file_ext->state),