drm: ctx release can happen before dev->ctxlist is allocated
From: Jon Smirl <jonsmirl@gmail.com> Signed-off-by: Dave Airlie <airlied@linux.ie>
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@ -259,7 +259,7 @@ int drm_release( struct inode *inode, struct file *filp )
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drm_fasync( -1, filp, 0 );
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down( &dev->ctxlist_sem );
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if ( !list_empty( &dev->ctxlist->head ) ) {
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if ( dev->ctxlist && (!list_empty(&dev->ctxlist->head))) {
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drm_ctx_list_t *pos, *n;
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list_for_each_entry_safe( pos, n, &dev->ctxlist->head, head ) {
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