MIPS: Octeon: Fix EOI handling.

If an interrupt handler disables interrupts, the EOI function will
just reenable them.  This will put us in an endless loop when the
upcoming Ethernet driver patches are applied.

Only reenable the interrupt on EOI if it is not IRQ_DISABLED.  This
requires that the EOI function be separate from the ENABLE function.
We also rename the ACK functions to correspond with their function.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
To: gregkh@suse.de
Patchwork: http://patchwork.linux-mips.org/patch/840/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index 6f2acf0..1460d08 100644
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -193,7 +193,7 @@
  * Disable the irq on the current core for chips that have the EN*_W1{S,C}
  * registers.
  */
-static void octeon_irq_ciu0_disable_v2(unsigned int irq)
+static void octeon_irq_ciu0_ack_v2(unsigned int irq)
 {
 	int index = cvmx_get_core_num() * 2;
 	u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0);
@@ -202,6 +202,20 @@
 }
 
 /*
+ * Enable the irq on the current core for chips that have the EN*_W1{S,C}
+ * registers.
+ */
+static void octeon_irq_ciu0_eoi_v2(unsigned int irq)
+{
+	struct irq_desc *desc = irq_desc + irq;
+	int index = cvmx_get_core_num() * 2;
+	u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0);
+
+	if ((desc->status & IRQ_DISABLED) == 0)
+		cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask);
+}
+
+/*
  * Disable the irq on the all cores for chips that have the EN*_W1{S,C}
  * registers.
  */
@@ -272,8 +286,8 @@
 	.name = "CIU0",
 	.enable = octeon_irq_ciu0_enable_v2,
 	.disable = octeon_irq_ciu0_disable_all_v2,
-	.ack = octeon_irq_ciu0_disable_v2,
-	.eoi = octeon_irq_ciu0_enable_v2,
+	.ack = octeon_irq_ciu0_ack_v2,
+	.eoi = octeon_irq_ciu0_eoi_v2,
 #ifdef CONFIG_SMP
 	.set_affinity = octeon_irq_ciu0_set_affinity_v2,
 #endif
@@ -374,7 +388,7 @@
  * Disable the irq on the current core for chips that have the EN*_W1{S,C}
  * registers.
  */
-static void octeon_irq_ciu1_disable_v2(unsigned int irq)
+static void octeon_irq_ciu1_ack_v2(unsigned int irq)
 {
 	int index = cvmx_get_core_num() * 2 + 1;
 	u64 mask = 1ull << (irq - OCTEON_IRQ_WDOG0);
@@ -383,6 +397,20 @@
 }
 
 /*
+ * Enable the irq on the current core for chips that have the EN*_W1{S,C}
+ * registers.
+ */
+static void octeon_irq_ciu1_eoi_v2(unsigned int irq)
+{
+	struct irq_desc *desc = irq_desc + irq;
+	int index = cvmx_get_core_num() * 2 + 1;
+	u64 mask = 1ull << (irq - OCTEON_IRQ_WDOG0);
+
+	if ((desc->status & IRQ_DISABLED) == 0)
+		cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(index), mask);
+}
+
+/*
  * Disable the irq on the all cores for chips that have the EN*_W1{S,C}
  * registers.
  */
@@ -455,8 +483,8 @@
 	.name = "CIU0",
 	.enable = octeon_irq_ciu1_enable_v2,
 	.disable = octeon_irq_ciu1_disable_all_v2,
-	.ack = octeon_irq_ciu1_disable_v2,
-	.eoi = octeon_irq_ciu1_enable_v2,
+	.ack = octeon_irq_ciu1_ack_v2,
+	.eoi = octeon_irq_ciu1_eoi_v2,
 #ifdef CONFIG_SMP
 	.set_affinity = octeon_irq_ciu1_set_affinity_v2,
 #endif