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

commit 5a2642f620eb6e40792822fa0eafe23046fbb55e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 0efc12d1a3d77f98716f500c5ca12f9f923e3e9d..5bd527b563eb4a23ee07c1379191a4c898253221 100644 (file)
--- 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 */
 
 
@@ -1150,8 +1151,8 @@ 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) {
@@ -1192,7 +1193,7 @@ 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);
        }
@@ -1200,7 +1201,7 @@ 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);
@@ -1254,8 +1255,10 @@ 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;
 }