DragonFly commits List (threaded) for 2009-09
git: DragonFly_RELEASE_2_4 CAM - Fix missing SIM lock in cam_periph_release()
Author: Matthew Dillon <email@example.com>
Date: Wed Sep 30 15:26:05 2009 -0700
CAM - Fix missing SIM lock in cam_periph_release()
* When releasing the last reference on a CAM peripheral which has been
marked invalid, the peripheral is then freed. Freeing the peripheral
requires the SIM lock.
Go through necessary tribulations to acquire the SIM lock. The lock order
is important (SIM lock first, XPT lock second), and the SIM lock may or
may not already be held by the thread.
* The bug could cause a crash after burning a CD as the CD becomes invalid
after the burn completes in order to reload its state.
Summary of changes:
sys/bus/cam/cam_periph.c | 52 ++++++++++++++++++++++++++++++++++++++--------
sys/bus/cam/cam_sim.c | 24 +++++++++++++++++++++
sys/bus/cam/cam_sim.h | 8 +++++-
3 files changed, 73 insertions(+), 11 deletions(-)
DragonFly BSD source repository