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make ddbridge device access count atomic

This commit is contained in:
none 2020-01-16 10:57:53 +01:00
parent b946de7e44
commit aa1b5369ac
2 changed files with 6 additions and 4 deletions
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8
ddbridge/ddbridge-core.c
View File

@ -3340,7 +3340,7 @@ static int ddb_release(struct inode *inode, struct file *file)
{
struct ddb *dev = file->private_data;
dev->ddb_dev_users--;
atomic_inc(&dev->ddb_dev_users);
return 0;
}
@ -3348,9 +3348,10 @@ static int ddb_open(struct inode *inode, struct file *file)
{
struct ddb *dev = ddbs[iminor(inode)];
if (dev->ddb_dev_users)
if (!atomic_dec_and_test(&dev->ddb_dev_users)) {
atomic_inc(&dev->ddb_dev_users);
return -EBUSY;
dev->ddb_dev_users++;
}
file->private_data = dev;
return 0;
}
@ -4278,6 +4279,7 @@ static int ddb_device_create(struct ddb *dev)
return -ENOMEM;
mutex_lock(&ddb_mutex);
dev->nr = ddb_num;
atomic_set(&dev->ddb_dev_users, 1);
ddbs[dev->nr] = dev;
dev->ddb_dev = device_create(&ddb_class, dev->dev,
MKDEV(ddb_major, dev->nr),

2
ddbridge/ddbridge.h
View File

@ -450,7 +450,7 @@ struct ddb {
struct ddb_dma odma[DDB_MAX_OUTPUT];
struct device *ddb_dev;
u32 ddb_dev_users;
atomic_t ddb_dev_users;
u32 nr;
u8 iobuf[1028];