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[media] dt3155v4l: remove V4L2_FL_LOCK_ALL_FOPS 

Add proper locking to the file operations, allowing for the removal
of the V4L2_FL_LOCK_ALL_FOPS flag.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-06-23 08:33:25 -03:00 committed by Mauro Carvalho Chehab
parent 14a09dac53
commit 0d0c1596b9
1 changed files with 22 additions and 7 deletions
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29
drivers/staging/media/dt3155v4l/dt3155v4l.c
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@ -381,6 +381,8 @@ dt3155_open(struct file *filp)
int ret = 0; int ret = 0;
struct dt3155_priv *pd = video_drvdata(filp); struct dt3155_priv *pd = video_drvdata(filp);
if (mutex_lock_interruptible(&pd->mux))
return -ERESTARTSYS;
if (!pd->users) { if (!pd->users) {
pd->q = kzalloc(sizeof(*pd->q), GFP_KERNEL); pd->q = kzalloc(sizeof(*pd->q), GFP_KERNEL);
if (!pd->q) { if (!pd->q) {
@ -411,6 +413,7 @@ dt3155_open(struct file *filp)
kfree(pd->q); kfree(pd->q);
pd->q = NULL; pd->q = NULL;
err_alloc_queue: err_alloc_queue:
mutex_unlock(&pd->mux);
return ret; return ret;
} }
@ -419,6 +422,7 @@ dt3155_release(struct file *filp)
{ {
struct dt3155_priv *pd = video_drvdata(filp); struct dt3155_priv *pd = video_drvdata(filp);
mutex_lock(&pd->mux);
pd->users--; pd->users--;
BUG_ON(pd->users < 0); BUG_ON(pd->users < 0);
if (!pd->users) { if (!pd->users) {
@ -429,6 +433,7 @@ dt3155_release(struct file *filp)
kfree(pd->q); kfree(pd->q);
pd->q = NULL; pd->q = NULL;
} }
mutex_unlock(&pd->mux);
return 0; return 0;
} }
@ -436,24 +441,38 @@ static ssize_t
dt3155_read(struct file *filp, char __user *user, size_t size, loff_t *loff) dt3155_read(struct file *filp, char __user *user, size_t size, loff_t *loff)
{ {
struct dt3155_priv *pd = video_drvdata(filp); struct dt3155_priv *pd = video_drvdata(filp);
ssize_t res;
return vb2_read(pd->q, user, size, loff, filp->f_flags & O_NONBLOCK); if (mutex_lock_interruptible(&pd->mux))
return -ERESTARTSYS;
res = vb2_read(pd->q, user, size, loff, filp->f_flags & O_NONBLOCK);
mutex_unlock(&pd->mux);
return res;
} }
static unsigned int static unsigned int
dt3155_poll(struct file *filp, struct poll_table_struct *polltbl) dt3155_poll(struct file *filp, struct poll_table_struct *polltbl)
{ {
struct dt3155_priv *pd = video_drvdata(filp); struct dt3155_priv *pd = video_drvdata(filp);
unsigned int res;
return vb2_poll(pd->q, filp, polltbl); mutex_lock(&pd->mux);
res = vb2_poll(pd->q, filp, polltbl);
mutex_unlock(&pd->mux);
return res;
} }
static int static int
dt3155_mmap(struct file *filp, struct vm_area_struct *vma) dt3155_mmap(struct file *filp, struct vm_area_struct *vma)
{ {
struct dt3155_priv *pd = video_drvdata(filp); struct dt3155_priv *pd = video_drvdata(filp);
int res;
return vb2_mmap(pd->q, vma); if (mutex_lock_interruptible(&pd->mux))
return -ERESTARTSYS;
res = vb2_mmap(pd->q, vma);
mutex_unlock(&pd->mux);
return res;
} }
static const struct v4l2_file_operations dt3155_fops = { static const struct v4l2_file_operations dt3155_fops = {
@ -898,10 +917,6 @@ dt3155_probe(struct pci_dev *pdev, const struct pci_device_id *id)
INIT_LIST_HEAD(&pd->dmaq); INIT_LIST_HEAD(&pd->dmaq);
mutex_init(&pd->mux); mutex_init(&pd->mux);
pd->vdev->lock = &pd->mux; /* for locking v4l2_file_operations */ pd->vdev->lock = &pd->mux; /* for locking v4l2_file_operations */
/* Locking in file operations other than ioctl should be done
by the driver, not the V4L2 core.
This driver needs auditing so that this flag can be removed. */
set_bit(V4L2_FL_LOCK_ALL_FOPS, &pd->vdev->flags);
spin_lock_init(&pd->lock); spin_lock_init(&pd->lock);
pd->csr2 = csr2_init; pd->csr2 = csr2_init;
pd->config = config_init; pd->config = config_init;