CVS commit: src/sys/external/bsd/drm2/dist/drm/i915

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Mon Aug 27 00:56:38 UTC 2018

Modified Files:
        src/sys/external/bsd/drm2/dist/drm/i915: i915_gem.c

Log Message:
Handle uvm object reference counts in uvm_map more carefully.

Acquire a reference unconditionally first; then let uvm_map consume
it on success, and release it ourselves on failure.

As we did before -- acquiring a fresh reference on success -- another
thread might release the reference with a concurrent uvm_unmap before
we could acquire it back, thereby destroying the object.

XXX pullup-7
XXX pullup-8


To generate a diff of this commit:
cvs rdiff -u -r1.34 -r1.35 src/sys/external/bsd/drm2/dist/drm/i915/i915_gem.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.