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drm: cdev lock_kernel() pushdown 

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jonathan Corbet 2008-05-15 11:34:16 -06:00
parent abedd296e9
commit 70ffa16e60
1 changed files with 7 additions and 2 deletions
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9
drivers/char/drm/drm_fops.c
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@ -37,6 +37,7 @@
#include "drmP.h"
#include "drm_sarea.h"
#include <linux/poll.h>
#include <linux/smp_lock.h>
static int drm_open_helper(struct inode *inode, struct file *filp,
struct drm_device * dev);
@ -174,12 +175,14 @@ int drm_stub_open(struct inode *inode, struct file *filp)
DRM_DEBUG("\n");
/* BKL pushdown: note that nothing else serializes idr_find() */
lock_kernel();
minor = idr_find(&drm_minors_idr, minor_id);
if (!minor)
return -ENODEV;
goto out;
if (!(dev = minor->dev))
return -ENODEV;
goto out;
old_fops = filp->f_op;
filp->f_op = fops_get(&dev->driver->fops);
@ -189,6 +192,8 @@ int drm_stub_open(struct inode *inode, struct file *filp)
}
fops_put(old_fops);
out:
unlock_kernel();
return err;
}