Author: imp
Date: Tue Oct 6 23:33:56 2020
New Revision: 366504
URL: https://svnweb.freebsd.org/changeset/base/366504
Log:
cam: Assert we have a reference when freeing sim
Before we decrement refcount to sleep on the sim, assert that the
refcount >= 1. If it were 0 here, we'd never wake up.
Modified:
head/sys/cam/cam_sim.c
Modified: head/sys/cam/cam_sim.c
==============================================================================
--- head/sys/cam/cam_sim.c Tue Oct 6 23:16:56 2020 (r366503)
+++ head/sys/cam/cam_sim.c Tue Oct 6 23:33:56 2020 (r366504)
@@ -134,6 +134,7 @@ cam_sim_free(struct cam_sim *sim, int free_devq)
mtx = sim->mtx;
mtx_assert(mtx, MA_OWNED);
}
+ KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
sim->refcount--;
if (sim->refcount > 0) {
error = msleep(sim, mtx, PRIBIO, "simfree", 0);
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