powerpc/mpic: Fix use of "flags" variable in mpic_alloc()

The mpic_alloc() function takes a "flags" parameter and assigns it into
the mpic->flags variable fairly early on, but several later pieces of
code detect various device-tree properties and save them into the
"mpic->flags" variable (EG: "big-endian" => MPIC_BIG_ENDIAN).

Unfortunately, a number of codepaths (including several which test the
flag MPIC_BIG_ENDIAN!) test "flags" instead of "mpic->flags", and get
wrong answers as a result.

Consolidate the device-tree flag tests early in mpic_alloc() and change
all of the checks after "mpic->flags" is init'ed to use "mpic->flags".

[BenH: Fixed up use of mpic->node before it's initialized]

Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 22 insertions, 24 deletions

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 4e9ccb1015de..9deec44ede83 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1182,6 +1182,14 @@ struct mpic * __init mpic_alloc(struct device_node *node,
                 }
         }
 
+        /* Read extra device-tree properties into the flags variable */
+        if (of_get_property(node, "big-endian", NULL))
+                flags |= MPIC_BIG_ENDIAN;
+        if (of_get_property(node, "pic-no-reset", NULL))
+                flags |= MPIC_NO_RESET;
+        if (of_device_is_compatible(node, "fsl,mpic"))
+                flags |= MPIC_FSL;
+
         mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
         if (mpic == NULL)
                 goto err_of_node_put;
@@ -1189,15 +1197,16 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         mpic->name = name;
         mpic->node = node;
         mpic->paddr = phys_addr;
+        mpic->flags = flags;
 
         mpic->hc_irq = mpic_irq_chip;
         mpic->hc_irq.name = name;
-        if (!(flags & MPIC_SECONDARY))
+        if (!(mpic->flags & MPIC_SECONDARY))
                 mpic->hc_irq.irq_set_affinity = mpic_set_affinity;
 #ifdef CONFIG_MPIC_U3_HT_IRQS
         mpic->hc_ht_irq = mpic_irq_ht_chip;
         mpic->hc_ht_irq.name = name;
-        if (!(flags & MPIC_SECONDARY))
+        if (!(mpic->flags & MPIC_SECONDARY))
                 mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity;
 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 
@@ -1209,12 +1218,11 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         mpic->hc_tm = mpic_tm_chip;
         mpic->hc_tm.name = name;
 
-        mpic->flags = flags;
         mpic->isu_size = isu_size;
         mpic->irq_count = irq_count;
         mpic->num_sources = 0; /* so far */
 
-        if (flags & MPIC_LARGE_VECTORS)
+        if (mpic->flags & MPIC_LARGE_VECTORS)
                 intvec_top = 2047;
         else
                 intvec_top = 255;
@@ -1233,12 +1241,6 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         mpic->ipi_vecs[3]   = intvec_top - 1;
         mpic->spurious_vec  = intvec_top;
 
-        /* Check for "big-endian" in device-tree */
-        if (of_get_property(mpic->node, "big-endian", NULL) != NULL)
-                mpic->flags |= MPIC_BIG_ENDIAN;
-        if (of_device_is_compatible(mpic->node, "fsl,mpic"))
-                mpic->flags |= MPIC_FSL;
-
         /* Look for protected sources */
         psrc = of_get_property(mpic->node, "protected-sources", &psize);
         if (psrc) {
@@ -1254,11 +1256,11 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         }
 
 #ifdef CONFIG_MPIC_WEIRD
-        mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
+        mpic->hw_set = mpic_infos[MPIC_GET_REGSET(mpic->flags)];
 #endif
 
         /* default register type */
-        if (flags & MPIC_BIG_ENDIAN)
+        if (mpic->flags & MPIC_BIG_ENDIAN)
                 mpic->reg_type = mpic_access_mmio_be;
         else
                 mpic->reg_type = mpic_access_mmio_le;
@@ -1268,10 +1270,10 @@ struct mpic * __init mpic_alloc(struct device_node *node,
          * only if the kernel includes DCR support.
          */
 #ifdef CONFIG_PPC_DCR
-        if (flags & MPIC_USES_DCR)
+        if (mpic->flags & MPIC_USES_DCR)
                 mpic->reg_type = mpic_access_dcr;
 #else
-        BUG_ON(flags & MPIC_USES_DCR);
+        BUG_ON(mpic->flags & MPIC_USES_DCR);
 #endif
 
         /* Map the global registers */
@@ -1283,10 +1285,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         /* When using a device-node, reset requests are only honored if the MPIC
          * is allowed to reset.
          */
-        if (of_get_property(mpic->node, "pic-no-reset", NULL))
-                mpic->flags |= MPIC_NO_RESET;
-
-        if ((flags & MPIC_WANTS_RESET) && !(mpic->flags & MPIC_NO_RESET)) {
+        if ((mpic->flags & MPIC_WANTS_RESET) && !(mpic->flags & MPIC_NO_RESET)) {
                 printk(KERN_DEBUG "mpic: Resetting\n");
                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
@@ -1297,12 +1296,12 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         }
 
         /* CoreInt */
-        if (flags & MPIC_ENABLE_COREINT)
+        if (mpic->flags & MPIC_ENABLE_COREINT)
                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
                            | MPIC_GREG_GCONF_COREINT);
 
-        if (flags & MPIC_ENABLE_MCK)
+        if (mpic->flags & MPIC_ENABLE_MCK)
                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
                            | MPIC_GREG_GCONF_MCK);
@@ -1313,7 +1312,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
          */
         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
         if (isu_size == 0) {
-                if (flags & MPIC_BROKEN_FRR_NIRQS)
+                if (mpic->flags & MPIC_BROKEN_FRR_NIRQS)
                         mpic->num_sources = mpic->irq_count;
                 else
                         mpic->num_sources =
@@ -1347,8 +1346,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 
         mpic->irqhost = irq_alloc_host(mpic->node, IRQ_HOST_MAP_LINEAR,
                                        isu_size ? isu_size : mpic->num_sources,
-                                       &mpic_host_ops,
-                                       flags & MPIC_LARGE_VECTORS ? 2048 : 256);
+                                       &mpic_host_ops, intvec_top + 1);
 
         /*
          * FIXME: The code leaks the MPIC object and mappings here; this
@@ -1383,7 +1381,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         mpic->next = mpics;
         mpics = mpic;
 
-        if (!(flags & MPIC_SECONDARY)) {
+        if (!(mpic->flags & MPIC_SECONDARY)) {
                 mpic_primary = mpic;
                 irq_set_default_host(mpic->irqhost);
         }