drm/nvc0/fb: take lock in nvc0_ram_put()
Kernel panic caused by list corruption in ltcg seems to indicate a concurrency issue. Take mutex of pfb like nv50_ram_put() to eliminate concurrency. V2: Separate critical section into separate function, avoid taking the lock twice on NVC0 Signed-off-by: NRoy Spliet <r.spliet@student.tudelft.nl> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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