[ARM] 2943/1: Clear the exclusive monitor in v6_early_abort

Patch from Catalin Marinas Data abort caused by ldrex/strex can leave the exclusive monitor in an unpredictable state. It is recommended that a clrex/strex is performed to clear this state. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
git-mirror · Oct 2, 2005 · 2c3a054 · 2c3a054
1 parent 487fd4e
commit 2c3a054
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/arch/arm/mm/abort-ev6.S b/arch/arm/mm/abort-ev6.S
@@ -20,6 +20,11 @@
  */
 	.align	5
 ENTRY(v6_early_abort)
+#ifdef CONFIG_CPU_MPCORE
+	clrex
+#else
+	strex	r0, r1, [sp]			@ Clear the exclusive monitor
+#endif
 	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
 	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
 /*