Messages in this thread | | | From | Johannes Weiner <> | Subject | lockdep splat from ioctl and mmap fops sharing lock | Date | Thu, 23 Oct 2008 15:58:10 +0200 |
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Johannes Weiner <hannes@saeurebad.de> writes:
> Hi, > > 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.
More affected drivers:
agp_ioctl() doing usercopy under agp_fe.agp_mutex agp_mmap() taking agp_fe.agp_mutex under mmap_sem
dv1394_write() doing usercopy under video->mtx dv1394_mmap() taking video->mtx under mmap_sem
raw1394_ioctl() doing usercopy under fi->state_mutex raw1394_mmap() taking fi->state_mutex under mmap_sem
Hannes
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