From f78d92c9ffcda7451b5943ab491c087f1ec7e08d Mon Sep 17 00:00:00 2001 From: Dean Anderson Date: Tue, 22 Jul 2008 14:43:27 -0300 Subject: V4L/DVB (8490): s2255drv Sensoray 2255 driver fixes This patch fixes timer issues in driver disconnect. It also removes the restriction of one user per channel at a time. Thanks to Oliver Neukum and Mauro Chehab for finding these issues. Locking of video stream partly based on saa7134 driver. Signed-off-by: Dean Anderson Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/s2255drv.c | 111 ++++++++++++++++++++++++----------------- 1 file changed, 65 insertions(+), 46 deletions(-) (limited to 'drivers/media/video/s2255drv.c') diff --git a/drivers/media/video/s2255drv.c b/drivers/media/video/s2255drv.c index 2428d441fe15..9ff5403483e5 100644 --- a/drivers/media/video/s2255drv.c +++ b/drivers/media/video/s2255drv.c @@ -185,6 +185,7 @@ struct s2255_dmaqueue { #define S2255_FW_LOADED_DSPWAIT 1 #define S2255_FW_SUCCESS 2 #define S2255_FW_FAILED 3 +#define S2255_FW_DISCONNECTING 4 struct s2255_fw { int fw_loaded; @@ -264,7 +265,6 @@ struct s2255_buffer { struct s2255_fh { struct s2255_dev *dev; - unsigned int resources; const struct s2255_fmt *fmt; unsigned int width; unsigned int height; @@ -274,14 +274,9 @@ struct s2255_fh { /* mode below is the desired mode. mode in s2255_dev is the current mode that was last set */ struct s2255_mode mode; + int resources[MAX_CHANNELS]; }; -/* - * TODO: fixme S2255_MAX_USERS. Do not limit open driver handles. - * Limit V4L to one stream at a time. - */ -#define S2255_MAX_USERS 1 - #define CUR_USB_FWVER 774 /* current cypress EEPROM firmware version */ #define S2255_MAJOR_VERSION 1 #define S2255_MINOR_VERSION 13 @@ -477,10 +472,9 @@ static void s2255_timer(unsigned long user_data) dprintk(100, "s2255 timer\n"); if (usb_submit_urb(data->fw_urb, GFP_ATOMIC) < 0) { printk(KERN_ERR "s2255: can't submit urb\n"); - if (data->fw) { - release_firmware(data->fw); - data->fw = NULL; - } + atomic_set(&data->fw_state, S2255_FW_FAILED); + /* wake up anything waiting for the firmware */ + wake_up(&data->wait_fw); return; } } @@ -510,13 +504,18 @@ static void s2255_fwchunk_complete(struct urb *urb) struct usb_device *udev = urb->dev; int len; dprintk(100, "udev %p urb %p", udev, urb); - /* TODO: fixme. reflect change in status */ if (urb->status) { dev_err(&udev->dev, "URB failed with status %d", urb->status); + atomic_set(&data->fw_state, S2255_FW_FAILED); + /* wake up anything waiting for the firmware */ + wake_up(&data->wait_fw); return; } if (data->fw_urb == NULL) { - dev_err(&udev->dev, "early disconncect\n"); + dev_err(&udev->dev, "s2255 disconnected\n"); + atomic_set(&data->fw_state, S2255_FW_FAILED); + /* wake up anything waiting for the firmware */ + wake_up(&data->wait_fw); return; } #define CHUNK_SIZE 512 @@ -790,7 +789,8 @@ static int res_get(struct s2255_dev *dev, struct s2255_fh *fh) } /* it's free, grab it */ dev->resources[fh->channel] = 1; - dprintk(1, "res: get\n"); + fh->resources[fh->channel] = 1; + dprintk(1, "s2255: res: get\n"); mutex_unlock(&dev->lock); return 1; } @@ -800,9 +800,18 @@ static int res_locked(struct s2255_dev *dev, struct s2255_fh *fh) return dev->resources[fh->channel]; } +static int res_check(struct s2255_fh *fh) +{ + return fh->resources[fh->channel]; +} + + static void res_free(struct s2255_dev *dev, struct s2255_fh *fh) { + mutex_lock(&dev->lock); dev->resources[fh->channel] = 0; + fh->resources[fh->channel] = 0; + mutex_unlock(&dev->lock); dprintk(1, "res: put\n"); } @@ -1233,7 +1242,7 @@ static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i) } if (!res_get(dev, fh)) { - dev_err(&dev->udev->dev, "res get busy\n"); + dev_err(&dev->udev->dev, "s2255: stream busy\n"); return -EBUSY; } @@ -1289,8 +1298,10 @@ static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) } s2255_stop_acquire(dev, fh->channel); res = videobuf_streamoff(&fh->vb_vidq); + if (res < 0) + return res; res_free(dev, fh); - return res; + return 0; } static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i) @@ -1463,12 +1474,7 @@ static int s2255_open(struct inode *inode, struct file *file) mutex_lock(&dev->open_lock); dev->users[cur_channel]++; - if (dev->users[cur_channel] > S2255_MAX_USERS) { - dev->users[cur_channel]--; - mutex_unlock(&dev->open_lock); - printk(KERN_INFO "s2255drv: too many open handles!\n"); - return -EBUSY; - } + dprintk(4, "s2255: open_handles %d\n", dev->users[cur_channel]); if (atomic_read(&dev->fw_data->fw_state) == S2255_FW_FAILED) { err("2255 firmware load failed. retrying.\n"); @@ -1479,7 +1485,8 @@ static int s2255_open(struct inode *inode, struct file *file) msecs_to_jiffies(S2255_LOAD_TIMEOUT)); if (atomic_read(&dev->fw_data->fw_state) != S2255_FW_SUCCESS) { - printk(KERN_INFO "2255 FW load failed after 2 tries\n"); + printk(KERN_INFO "2255 FW load failed.\n"); + dev->users[cur_channel]--; mutex_unlock(&dev->open_lock); return -EFAULT; } @@ -1495,6 +1502,7 @@ static int s2255_open(struct inode *inode, struct file *file) != S2255_FW_SUCCESS) { printk(KERN_INFO "2255 firmware not loaded" "try again\n"); + dev->users[cur_channel]--; mutex_unlock(&dev->open_lock); return -EBUSY; } @@ -1503,6 +1511,7 @@ static int s2255_open(struct inode *inode, struct file *file) /* allocate + initialize per filehandle data */ fh = kzalloc(sizeof(*fh), GFP_KERNEL); if (NULL == fh) { + dev->users[cur_channel]--; mutex_unlock(&dev->open_lock); return -ENOMEM; } @@ -1562,44 +1571,48 @@ static void s2255_destroy(struct kref *kref) printk(KERN_ERR "s2255drv: kref problem\n"); return; } + + /* + * Wake up any firmware load waiting (only done in .open, + * which holds the open_lock mutex) + */ + atomic_set(&dev->fw_data->fw_state, S2255_FW_DISCONNECTING); + wake_up(&dev->fw_data->wait_fw); + /* prevent s2255_disconnect from racing s2255_open */ mutex_lock(&dev->open_lock); s2255_exit_v4l(dev); - /* device unregistered so no longer possible to open. open_mutex - can be unlocked */ + /* + * device unregistered so no longer possible to open. open_mutex + * can be unlocked and timers deleted afterwards. + */ mutex_unlock(&dev->open_lock); /* board shutdown stops the read pipe if it is running */ s2255_board_shutdown(dev); /* make sure firmware still not trying to load */ + del_timer(&dev->timer); /* only started in .probe and .open */ + if (dev->fw_data->fw_urb) { dprintk(2, "kill fw_urb\n"); usb_kill_urb(dev->fw_data->fw_urb); usb_free_urb(dev->fw_data->fw_urb); dev->fw_data->fw_urb = NULL; } + /* - * TODO: fixme(above, below): potentially leaving timers alive. - * do not ignore timeout below if - * it occurs. + * delete the dsp_wait timer, which sets the firmware + * state on completion. This is done before fw_data + * is freed below. */ - /* make sure we aren't waiting for the DSP */ - if (atomic_read(&dev->fw_data->fw_state) == S2255_FW_LOADED_DSPWAIT) { - /* if we are, wait for the wakeup for fw_success or timeout */ - wait_event_timeout(dev->fw_data->wait_fw, - (atomic_read(&dev->fw_data->fw_state) - == S2255_FW_SUCCESS), - msecs_to_jiffies(S2255_LOAD_TIMEOUT)); - } + del_timer(&dev->fw_data->dsp_wait); /* only started in .open */ - if (dev->fw_data) { - if (dev->fw_data->fw) - release_firmware(dev->fw_data->fw); - kfree(dev->fw_data->pfw_data); - kfree(dev->fw_data); - } + if (dev->fw_data->fw) + release_firmware(dev->fw_data->fw); + kfree(dev->fw_data->pfw_data); + kfree(dev->fw_data); usb_put_dev(dev->udev); dprintk(1, "%s", __func__); @@ -1616,17 +1629,23 @@ static int s2255_close(struct inode *inode, struct file *file) mutex_lock(&dev->open_lock); - if (dev->b_acquire[fh->channel]) - s2255_stop_acquire(dev, fh->channel); - res_free(dev, fh); + /* turn off stream */ + if (res_check(fh)) { + if (dev->b_acquire[fh->channel]) + s2255_stop_acquire(dev, fh->channel); + videobuf_streamoff(&fh->vb_vidq); + res_free(dev, fh); + } + videobuf_mmap_free(&fh->vb_vidq); - kfree(fh); dev->users[fh->channel]--; + mutex_unlock(&dev->open_lock); kref_put(&dev->kref, s2255_destroy); dprintk(1, "s2255: close called (minor=%d, users=%d)\n", minor, dev->users[fh->channel]); + kfree(fh); return 0; } -- cgit v1.2.3