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@@ -37,6 +37,7 @@
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#include "drmP.h"
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#include "drm_sarea.h"
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#include <linux/poll.h>
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+#include <linux/smp_lock.h>
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static int drm_open_helper(struct inode *inode, struct file *filp,
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struct drm_device * dev);
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@@ -174,12 +175,14 @@ int drm_stub_open(struct inode *inode, struct file *filp)
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DRM_DEBUG("\n");
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+ /* BKL pushdown: note that nothing else serializes idr_find() */
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+ lock_kernel();
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minor = idr_find(&drm_minors_idr, minor_id);
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if (!minor)
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- return -ENODEV;
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+ goto out;
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if (!(dev = minor->dev))
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- return -ENODEV;
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+ goto out;
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old_fops = filp->f_op;
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filp->f_op = fops_get(&dev->driver->fops);
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@@ -189,6 +192,8 @@ int drm_stub_open(struct inode *inode, struct file *filp)
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}
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fops_put(old_fops);
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+out:
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+ unlock_kernel();
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return err;
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}
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