path: root/drivers/gpu/drm/drm_crtc.c
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authorMike Snitzer <snitzer@redhat.com>2015-03-23 17:01:43 -0400
committerMike Snitzer <snitzer@redhat.com>2015-03-23 18:14:00 -0400
commit63a4f065ece613b6d575b538234375b0e9c23bbc (patch)
treee1a7896387c308886622e6b7edd3f5225873fa0f /drivers/gpu/drm/drm_crtc.c
parente5db29806b99ce2b2640d2e4d4fcb983cea115c5 (diff)
dm: fix add_disk() NULL pointer due to race with free_dev()
Commit c4db59d31e39 ("fs: don't reassign dirty inodes to default_backing_dev_info") exposed DM to a latent race in free_dev() vs add_disk() in relation to management of the device's minor number. Fix this by refactoring free_dev() to match cleanup order of the alloc_dev() error path. Move cleanup of the gendisk, queue, and bdev to _before_ the cleanup of the idr managed minor number. Also, purely due to cleanup that fell out during the free_dev() audit: - adjust dm_blk_close() to access the gendisk's private_data under the _minor_lock spinlock. - move __dm_destroy()'s dm_get_live_table() call out from under the _minor_lock spinlock. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1202449 Reported-by: Zdenek Kabelac <zkabelac@redhat.com> Reported-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_crtc.c')
0 files changed, 0 insertions, 0 deletions