Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:
 "Four small fixes for irqchip drivers:

   - Add missing low level irq handler initialization on mxs, so
     interrupts can acutally be delivered

   - Add a missing barrier to the GIC driver

   - Two fixes for the GIC-V3-ITS driver, addressing a double EOI write
     and a cache flush beyond the actual region"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/gic-v3: Add missing barrier to 32bit version of gic_read_iar()
  irqchip/mxs: Add missing set_handle_irq()
  irqchip/gicv3-its: Avoid cache flush beyond ITS_BASERn memory size
  irqchip/gic-v3-its: Fix double ICC_EOIR write for LPI in EOImode==1

2 files changed, 8 insertions, 11 deletions

diff --git a/arch/arm/include/asm/arch_gicv3.h b/arch/arm/include/asm/arch_gicv3.h
index 7da5503c0591..e08d15184056 100644
--- a/arch/arm/include/asm/arch_gicv3.h
+++ b/arch/arm/include/asm/arch_gicv3.h
@@ -117,6 +117,7 @@ static inline u32 gic_read_iar(void)
         u32 irqstat;
 
         asm volatile("mrc " __stringify(ICC_IAR1) : "=r" (irqstat));
+        dsb(sy);
         return irqstat;
 }
 
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 0a73632b28d5..43dfd15c1dd2 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -78,6 +78,9 @@ struct its_node {
 
 #define ITS_ITT_ALIGN           SZ_256
 
+/* Convert page order to size in bytes */
+#define PAGE_ORDER_TO_SIZE(o)   (PAGE_SIZE << (o))
+
 struct event_lpi_map {
         unsigned long           *lpi_map;
         u16                     *col_map;
@@ -600,11 +603,6 @@ static void its_unmask_irq(struct irq_data *d)
         lpi_set_config(d, true);
 }
 
-static void its_eoi_irq(struct irq_data *d)
-{
-        gic_write_eoir(d->hwirq);
-}
-
 static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
                             bool force)
 {
@@ -641,7 +639,7 @@ static struct irq_chip its_irq_chip = {
         .name                   = "ITS",
         .irq_mask               = its_mask_irq,
         .irq_unmask             = its_unmask_irq,
-        .irq_eoi                = its_eoi_irq,
+        .irq_eoi                = irq_chip_eoi_parent,
         .irq_set_affinity       = its_set_affinity,
         .irq_compose_msi_msg    = its_irq_compose_msi_msg,
 };
@@ -846,7 +844,6 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
                 u64 type = GITS_BASER_TYPE(val);
                 u64 entry_size = GITS_BASER_ENTRY_SIZE(val);
                 int order = get_order(psz);
-                int alloc_size;
                 int alloc_pages;
                 u64 tmp;
                 void *base;
@@ -878,9 +875,8 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
                         }
                 }
 
-                alloc_size = (1 << order) * PAGE_SIZE;
 retry_alloc_baser:
-                alloc_pages = (alloc_size / psz);
+                alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz);
                 if (alloc_pages > GITS_BASER_PAGES_MAX) {
                         alloc_pages = GITS_BASER_PAGES_MAX;
                         order = get_order(GITS_BASER_PAGES_MAX * psz);
@@ -933,7 +929,7 @@ retry_baser:
                         shr = tmp & GITS_BASER_SHAREABILITY_MASK;
                         if (!shr) {
                                 cache = GITS_BASER_nC;
-                                __flush_dcache_area(base, alloc_size);
+                                __flush_dcache_area(base, PAGE_ORDER_TO_SIZE(order));
                         }
                         goto retry_baser;
                 }
@@ -966,7 +962,7 @@ retry_baser:
                 }
 
                 pr_info("ITS: allocated %d %s @%lx (psz %dK, shr %d)\n",
-                        (int)(alloc_size / entry_size),
+                        (int)(PAGE_ORDER_TO_SIZE(order) / entry_size),
                         its_base_type_string[type],
                         (unsigned long)virt_to_phys(base),
                         psz / SZ_1K, (int)shr >> GITS_BASER_SHAREABILITY_SHIFT);