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copy: safeguard potential race

This commit is contained in:
Thomas Schoebel-Theuer 2023-05-24 11:52:02 +02:00
parent e58488a777
commit bdf8d6e7eb
1 changed files with 3 additions and 6 deletions
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9
kernel/mars_copy.c
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@ -106,13 +106,9 @@ void notify_clash(struct copy_brick *brick, bool do_wake)
}
static inline
bool clear_clash(struct copy_brick *brick)
void clear_clash(struct copy_brick *brick)
{
bool cleared;
cleared = cmpxchg(&brick->clash, true, false);
smp_mb();
return cleared;
cmpxchg(&brick->clash, true, false);
}
/* Current semantics (NOT REALLY IMPLEMENTED because OUTPUT IS NOT IN USE)
@ -1031,6 +1027,7 @@ int _run_copy(struct copy_brick *brick, loff_t this_start)
MARS_DBG("clash\n");
_clear_all_mref(brick);
_clear_state_table(brick);
smp_mb();
clear_clash(brick);
}
}