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authorBjoern B. Brandenburg <bbb@cs.unc.edu>2009-10-05 14:10:44 -0400
committerBjoern B. Brandenburg <bbb@cs.unc.edu>2009-10-05 14:10:44 -0400
commit4ad2bcf6f6fff31ace097f7616b002df445110ec (patch)
treed7dda7c8cdfcabf1e92ac7044f0e08b3b7cc455c /drivers/or
parentf8ed8c406d70b9a040807a01de5296d8832cafd7 (diff)
Bugfix: Fix FMLP priority inheritance under GSN-EDFHEADmaster
This fixes a regression introduced by the RTSS'09 improvements. Just calling unlink() on any task is not safe: it might reside in a release heap. This was done in the case that a new blocker increases a lock holder's priority. To avoid crashing in this case, the FMLP code was changed to be more careful when propagating an inherited priority. The code now detects three different scenarios and uses heap_decrease() to update the position of the lock holder's heap node. This fixes a simple test case.
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