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consolidate the reassignments of ->f_op in ->open() instances

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2013-09-22 14:17:15 -04:00
parent 7b00ed6fe6
commit e84f9e57b9
8 changed files with 43 additions and 77 deletions
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17
drivers/gpu/drm/drm_fops.c
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@@ -148,7 +148,7 @@ int drm_stub_open(struct inode *inode, struct file *filp)
struct drm_minor *minor;
int minor_id = iminor(inode);
int err = -ENODEV;
const struct file_operations *old_fops;
const struct file_operations *new_fops;
DRM_DEBUG("\n");
@@ -163,18 +163,13 @@ int drm_stub_open(struct inode *inode, struct file *filp)
if (drm_device_is_unplugged(dev))
goto out;
old_fops = filp->f_op;
filp->f_op = fops_get(dev->driver->fops);
if (filp->f_op == NULL) {
filp->f_op = old_fops;
new_fops = fops_get(dev->driver->fops);
if (!new_fops)
goto out;
}
if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
fops_put(filp->f_op);
filp->f_op = fops_get(old_fops);
}
fops_put(old_fops);
replace_fops(filp, new_fops);
if (filp->f_op->open)
err = filp->f_op->open(inode, filp);
out:
mutex_unlock(&drm_global_mutex);
return err;