lockdep splat from fbmem

From: Johannes Weiner
Date: Wed Oct 22 2008 - 23:28:50 EST


fb_mmap() is called under mmap_sem and acquires fb_info->lock.

Since 3e680aae4e53ab "fb: convert lock/unlock_kernel() into local fb
mutex", fb_ioctl() takes fb_info->lock and does copy_to/from_user()
under it, which in turn might acquire mmap_sem.

Just noticed the trace and wanted to let you know.

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