handle recursive calls to bust_spinlocks()

Various architectures may call bust_spinlocks() recursively; the function itself, however, doesn't appear to be meant to be called in this manner. Nevertheless, this doesn't appear to be a problem as long as bust_spinlocks(0) doesn't get called twice in a row (otherwise, unblank_screen() may enter the scheduler). However, at least on i386 die() has been capable of returning (and on other architectures this should really be that way, too) when notify_die() returns NOTIFY_STOP. Short of getting a reply to a respective query, this patch makes bust_spinlocks() increment/decrement oops_in_progress, and wake klogd only when the count drops back to zero. Signed-off-by: Jan Beulich <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
mrcsosa · Oct 17, 2007 · 0044299 · 0044299
1 parent b311e92
commit 0044299
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/lib/bust_spinlocks.c b/lib/bust_spinlocks.c
@@ -17,13 +17,13 @@
 void __attribute__((weak)) bust_spinlocks(int yes)
 {
 	if (yes) {
-		oops_in_progress = 1;
+		++oops_in_progress;
 	} else {
 #ifdef CONFIG_VT
 		unblank_screen();
 #endif
-		oops_in_progress = 0;
-		wake_up_klogd();
+		if (--oops_in_progress == 0)
+			wake_up_klogd();
 	}
 }