powerpc/mpic: Fix mapping of "DCR" based MPIC variants

Commit 31207dab7d2e63795eb15823947bd2f7025b08e2
"Fix incorrect allocation of interrupt rev-map"
introduced a regression crashing on boot on machines using
a "DCR" based MPIC, such as the Cell blades.

The reason is that the irq host data structure is initialized
much later as a result of that patch, causing our calls to
mpic_map() do be done before we have a host setup.

Unfortunately, this breaks _mpic_map_dcr() which uses the
mpic->irqhost to get to the device node.

This fixes it by, instead, passing the device node explicitely
to mpic_map().

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Akira Tsukamoto <akirat@rd.scei.sony.co.jp>

1 files changed, 16 insertions, 13 deletions

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 9c3af5045495..32a2e950f563 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -279,28 +279,29 @@ static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
 }
 
 #ifdef CONFIG_PPC_DCR
-static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
+static void _mpic_map_dcr(struct mpic *mpic, struct device_node *node,
+                          struct mpic_reg_bank *rb,
                           unsigned int offset, unsigned int size)
 {
         const u32 *dbasep;
 
-        dbasep = of_get_property(mpic->irqhost->of_node, "dcr-reg", NULL);
+        dbasep = of_get_property(node, "dcr-reg", NULL);
 
-        rb->dhost = dcr_map(mpic->irqhost->of_node, *dbasep + offset, size);
+        rb->dhost = dcr_map(node, *dbasep + offset, size);
         BUG_ON(!DCR_MAP_OK(rb->dhost));
 }
 
-static inline void mpic_map(struct mpic *mpic, phys_addr_t phys_addr,
-                            struct mpic_reg_bank *rb, unsigned int offset,
-                            unsigned int size)
+static inline void mpic_map(struct mpic *mpic, struct device_node *node,
+                            phys_addr_t phys_addr, struct mpic_reg_bank *rb,
+                            unsigned int offset, unsigned int size)
 {
         if (mpic->flags & MPIC_USES_DCR)
-                _mpic_map_dcr(mpic, rb, offset, size);
+                _mpic_map_dcr(mpic, node, rb, offset, size);
         else
                 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
 }
 #else /* CONFIG_PPC_DCR */
-#define mpic_map(m,p,b,o,s)     _mpic_map_mmio(m,p,b,o,s)
+#define mpic_map(m,n,p,b,o,s)   _mpic_map_mmio(m,p,b,o,s)
 #endif /* !CONFIG_PPC_DCR */
 
 
@@ -1152,8 +1153,8 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         }
 
         /* Map the global registers */
-        mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
-        mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
+        mpic_map(mpic, node, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
+        mpic_map(mpic, node, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
 
         /* Reset */
         if (flags & MPIC_WANTS_RESET) {
@@ -1194,7 +1195,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 
         /* Map the per-CPU registers */
         for (i = 0; i < mpic->num_cpus; i++) {
-                mpic_map(mpic, paddr, &mpic->cpuregs[i],
+                mpic_map(mpic, node, paddr, &mpic->cpuregs[i],
                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
                          0x1000);
         }
@@ -1202,7 +1203,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         /* Initialize main ISU if none provided */
         if (mpic->isu_size == 0) {
                 mpic->isu_size = mpic->num_sources;
-                mpic_map(mpic, paddr, &mpic->isus[0],
+                mpic_map(mpic, node, paddr, &mpic->isus[0],
                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
         }
         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
@@ -1256,8 +1257,10 @@ void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
 
         BUG_ON(isu_num >= MPIC_MAX_ISU);
 
-        mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,
+        mpic_map(mpic, mpic->irqhost->of_node,
+                 paddr, &mpic->isus[isu_num], 0,
                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
+
         if ((isu_first + mpic->isu_size) > mpic->num_sources)
                 mpic->num_sources = isu_first + mpic->isu_size;
 }