From: Christian Gromm Date: Mon, 28 Sep 2015 15:18:35 +0000 (+0200) Subject: staging: most: fix channel operation in multi-aim context X-Git-Tag: firefly_0821_release~176^2~802^2~1766 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f13f6981bca3c79ba97c4092ab5ed6aed8b2ce99;p=firefly-linux-kernel-4.4.55.git staging: most: fix channel operation in multi-aim context This patch fixes the opening and closing process of a physical channel when used by different AIMs. Signed-off-by: Andrey Shvetsov Signed-off-by: Christian Gromm Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/most/aim-cdev/cdev.c b/drivers/staging/most/aim-cdev/cdev.c index 1a17e2af6a60..a8a7689231ac 100644 --- a/drivers/staging/most/aim-cdev/cdev.c +++ b/drivers/staging/most/aim-cdev/cdev.c @@ -27,6 +27,7 @@ static dev_t aim_devno; static struct class *aim_class; static struct ida minor_id; static unsigned int major; +static struct most_aim cdev_aim; struct aim_channel { wait_queue_head_t wq; @@ -96,7 +97,7 @@ static int aim_open(struct inode *inode, struct file *filp) return -EBUSY; } - ret = most_start_channel(channel->iface, channel->channel_id); + ret = most_start_channel(channel->iface, channel->channel_id, &cdev_aim); if (ret) atomic_dec(&channel->access_ref); return ret; @@ -134,7 +135,7 @@ static int aim_close(struct inode *inode, struct file *filp) most_put_mbo(mbo); if (channel->keep_mbo) most_put_mbo(channel->stacked_mbo); - ret = most_stop_channel(channel->iface, channel->channel_id); + ret = most_stop_channel(channel->iface, channel->channel_id, &cdev_aim); atomic_dec(&channel->access_ref); wake_up_interruptible(&channel->wq); return ret; diff --git a/drivers/staging/most/aim-network/networking.c b/drivers/staging/most/aim-network/networking.c index 761c4cbff3e1..c13bd89226d3 100644 --- a/drivers/staging/most/aim-network/networking.c +++ b/drivers/staging/most/aim-network/networking.c @@ -79,6 +79,7 @@ struct net_dev_context { static struct list_head net_devices = LIST_HEAD_INIT(net_devices); static struct spinlock list_lock; +static struct most_aim aim; static int skb_to_mamac(const struct sk_buff *skb, struct mbo *mbo) @@ -194,14 +195,14 @@ static int most_nd_open(struct net_device *dev) BUG_ON(!nd->tx.linked || !nd->rx.linked); - if (most_start_channel(nd->iface, nd->rx.ch_id)) { + if (most_start_channel(nd->iface, nd->rx.ch_id, &aim)) { netdev_err(dev, "most_start_channel() failed\n"); return -EBUSY; } - if (most_start_channel(nd->iface, nd->tx.ch_id)) { + if (most_start_channel(nd->iface, nd->tx.ch_id, &aim)) { netdev_err(dev, "most_start_channel() failed\n"); - most_stop_channel(nd->iface, nd->rx.ch_id); + most_stop_channel(nd->iface, nd->rx.ch_id, &aim); return -EBUSY; } @@ -227,8 +228,8 @@ static int most_nd_stop(struct net_device *dev) netif_stop_queue(dev); if (nd->channels_opened) { - most_stop_channel(nd->iface, nd->rx.ch_id); - most_stop_channel(nd->iface, nd->tx.ch_id); + most_stop_channel(nd->iface, nd->rx.ch_id, &aim); + most_stop_channel(nd->iface, nd->tx.ch_id, &aim); nd->channels_opened = false; } diff --git a/drivers/staging/most/aim-sound/sound.c b/drivers/staging/most/aim-sound/sound.c index 27449d20328a..2d4732c10df4 100644 --- a/drivers/staging/most/aim-sound/sound.c +++ b/drivers/staging/most/aim-sound/sound.c @@ -26,6 +26,7 @@ #define DRIVER_NAME "sound" static struct list_head dev_list; +static struct most_aim audio_aim; /** * struct channel - private structure to keep channel specific data @@ -298,7 +299,7 @@ static int pcm_open(struct snd_pcm_substream *substream) return PTR_ERR(channel->playback_task); } - if (most_start_channel(channel->iface, channel->id)) { + if (most_start_channel(channel->iface, channel->id, &audio_aim)) { pr_err("most_start_channel() failed!\n"); if (cfg->direction == MOST_CH_TX) kthread_stop(channel->playback_task); @@ -333,7 +334,7 @@ static int pcm_close(struct snd_pcm_substream *substream) if (channel->cfg->direction == MOST_CH_TX) kthread_stop(channel->playback_task); - most_stop_channel(channel->iface, channel->id); + most_stop_channel(channel->iface, channel->id, &audio_aim); return 0; } diff --git a/drivers/staging/most/aim-v4l2/video.c b/drivers/staging/most/aim-v4l2/video.c index 377bb107c94c..345a82437311 100644 --- a/drivers/staging/most/aim-v4l2/video.c +++ b/drivers/staging/most/aim-v4l2/video.c @@ -32,6 +32,7 @@ #define V4L2_AIM_MAX_INPUT 1 +static struct most_aim aim_info; struct most_video_dev { struct most_interface *iface; @@ -107,7 +108,7 @@ static int aim_vdev_open(struct file *filp) v4l2_fh_add(&fh->fh); - ret = most_start_channel(mdev->iface, mdev->ch_idx); + ret = most_start_channel(mdev->iface, mdev->ch_idx, &aim_info); if (ret) { pr_err("most_start_channel() failed\n"); goto err_rm; @@ -151,7 +152,7 @@ static int aim_vdev_close(struct file *filp) spin_lock(&mdev->list_lock); } spin_unlock(&mdev->list_lock); - most_stop_channel(mdev->iface, mdev->ch_idx); + most_stop_channel(mdev->iface, mdev->ch_idx, &aim_info); mdev->mute = false; v4l2_fh_del(&fh->fh); diff --git a/drivers/staging/most/mostcore/core.c b/drivers/staging/most/mostcore/core.c index 5d996285fdee..0053b8cc5363 100644 --- a/drivers/staging/most/mostcore/core.c +++ b/drivers/staging/most/mostcore/core.c @@ -44,7 +44,7 @@ struct most_c_obj { atomic_t mbo_nq_level; uint16_t channel_id; bool is_poisoned; - bool is_started; + struct mutex start_mutex; int is_starving; struct most_interface *iface; struct most_inst_obj *inst; @@ -57,6 +57,8 @@ struct most_c_obj { struct list_head list; struct most_aim *first_aim; struct most_aim *second_aim; + int first_aim_refs; + int second_aim_refs; struct list_head trash_fifo; struct task_struct *hdm_enqueue_task; struct mutex stop_task_mutex; @@ -1234,10 +1236,11 @@ static void arm_mbo(struct mbo *mbo) list_add_tail(&mbo->list, &c->fifo); spin_unlock_irqrestore(&c->fifo_lock, flags); - if (c->second_aim && c->second_aim->tx_completion) - c->second_aim->tx_completion(c->iface, c->channel_id); - if (c->first_aim && c->first_aim->tx_completion) + if (c->first_aim_refs && c->first_aim->tx_completion) c->first_aim->tx_completion(c->iface, c->channel_id); + + if (c->second_aim_refs && c->second_aim->tx_completion) + c->second_aim->tx_completion(c->iface, c->channel_id); } /** @@ -1441,11 +1444,12 @@ EXPORT_SYMBOL_GPL(most_put_mbo); */ static void most_read_completion(struct mbo *mbo) { - struct most_c_obj *c; + struct most_c_obj *c = mbo->context; - c = mbo->context; - if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) - goto release_mbo; + if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) { + trash_mbo(mbo); + return; + } if (mbo->status == MBO_E_INVAL) { nq_hdm_mbo(mbo); @@ -1458,16 +1462,15 @@ static void most_read_completion(struct mbo *mbo) c->is_starving = 1; } - if (c->first_aim && c->first_aim->rx_completion && + if (c->first_aim_refs && c->first_aim->rx_completion && c->first_aim->rx_completion(mbo) == 0) return; - if (c->second_aim && c->second_aim->rx_completion && + + if (c->second_aim_refs && c->second_aim->rx_completion && c->second_aim->rx_completion(mbo) == 0) return; - pr_info("WARN: no driver linked with this channel\n"); - mbo->status = MBO_E_CLOSE; -release_mbo: - trash_mbo(mbo); + + most_put_mbo(mbo); } /** @@ -1480,7 +1483,8 @@ release_mbo: * * Returns 0 on success or error code otherwise. */ -int most_start_channel(struct most_interface *iface, int id) +int most_start_channel(struct most_interface *iface, int id, + struct most_aim *aim) { int num_buffer; int ret; @@ -1489,11 +1493,13 @@ int most_start_channel(struct most_interface *iface, int id) if (unlikely(!c)) return -EINVAL; - if (c->is_started) - return -EBUSY; + mutex_lock(&c->start_mutex); + if (c->first_aim_refs + c->second_aim_refs > 0) + goto out; /* already started by other aim */ if (!try_module_get(iface->mod)) { pr_info("failed to acquire HDM lock\n"); + mutex_unlock(&c->start_mutex); return -ENOLCK; } modref++; @@ -1523,14 +1529,22 @@ int most_start_channel(struct most_interface *iface, int id) if (ret) goto error; - c->is_started = true; c->is_starving = 0; atomic_set(&c->mbo_ref, num_buffer); + +out: + if (aim == c->first_aim) + c->first_aim_refs++; + if (aim == c->second_aim) + c->second_aim_refs++; + mutex_unlock(&c->start_mutex); return 0; + error: if (iface->mod) module_put(iface->mod); modref--; + mutex_unlock(&c->start_mutex); return ret; } EXPORT_SYMBOL_GPL(most_start_channel); @@ -1540,7 +1554,8 @@ EXPORT_SYMBOL_GPL(most_start_channel); * @iface: pointer to interface instance * @id: channel ID */ -int most_stop_channel(struct most_interface *iface, int id) +int most_stop_channel(struct most_interface *iface, int id, + struct most_aim *aim) { struct most_c_obj *c; @@ -1552,8 +1567,9 @@ int most_stop_channel(struct most_interface *iface, int id) if (unlikely(!c)) return -EINVAL; - if (!c->is_started) - return 0; + mutex_lock(&c->start_mutex); + if (c->first_aim_refs + c->second_aim_refs >= 2) + goto out; mutex_lock(&c->stop_task_mutex); if (c->hdm_enqueue_task) @@ -1564,6 +1580,7 @@ int most_stop_channel(struct most_interface *iface, int id) mutex_lock(&deregister_mutex); if (atomic_read(&c->inst->tainted)) { mutex_unlock(&deregister_mutex); + mutex_unlock(&c->start_mutex); return -ENODEV; } mutex_unlock(&deregister_mutex); @@ -1577,6 +1594,7 @@ int most_stop_channel(struct most_interface *iface, int id) if (c->iface->poison_channel(c->iface, c->channel_id)) { pr_err("Cannot stop channel %d of mdev %s\n", c->channel_id, c->iface->description); + mutex_unlock(&c->start_mutex); return -EAGAIN; } flush_trash_fifo(c); @@ -1585,13 +1603,20 @@ int most_stop_channel(struct most_interface *iface, int id) #ifdef CMPL_INTERRUPTIBLE if (wait_for_completion_interruptible(&c->cleanup)) { pr_info("Interrupted while clean up ch %d\n", c->channel_id); + mutex_unlock(&c->start_mutex); return -EINTR; } #else wait_for_completion(&c->cleanup); #endif c->is_poisoned = false; - c->is_started = false; + +out: + if (aim == c->first_aim) + c->first_aim_refs--; + if (aim == c->second_aim) + c->second_aim_refs--; + mutex_unlock(&c->start_mutex); return 0; } EXPORT_SYMBOL_GPL(most_stop_channel); @@ -1725,7 +1750,6 @@ struct kobject *most_register_interface(struct most_interface *iface) c->keep_mbo = false; c->enqueue_halt = false; c->is_poisoned = false; - c->is_started = false; c->cfg.direction = 0; c->cfg.data_type = 0; c->cfg.num_buffers = 0; @@ -1738,6 +1762,7 @@ struct kobject *most_register_interface(struct most_interface *iface) INIT_LIST_HEAD(&c->halt_fifo); init_completion(&c->cleanup); atomic_set(&c->mbo_ref, 0); + mutex_init(&c->start_mutex); mutex_init(&c->stop_task_mutex); list_add_tail(&c->list, &inst->channel_list); } @@ -1784,7 +1809,7 @@ void most_deregister_interface(struct most_interface *iface) } list_for_each_entry(c, &i->channel_list, list) { - if (!c->is_started) + if (c->first_aim_refs + c->second_aim_refs <= 0) continue; mutex_lock(&c->stop_task_mutex); diff --git a/drivers/staging/most/mostcore/mostcore.h b/drivers/staging/most/mostcore/mostcore.h index 299c7d5aa73a..e23ad7c33249 100644 --- a/drivers/staging/most/mostcore/mostcore.h +++ b/drivers/staging/most/mostcore/mostcore.h @@ -309,8 +309,10 @@ int most_register_aim(struct most_aim *aim); int most_deregister_aim(struct most_aim *aim); struct mbo *most_get_mbo(struct most_interface *iface, int channel_idx); void most_put_mbo(struct mbo *mbo); -int most_start_channel(struct most_interface *iface, int channel_idx); -int most_stop_channel(struct most_interface *iface, int channel_idx); +int most_start_channel(struct most_interface *iface, int channel_idx, + struct most_aim *); +int most_stop_channel(struct most_interface *iface, int channel_idx, + struct most_aim *); #endif /* MOST_CORE_H_ */