From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun, 9 Sep 2018 13:49:29 +0000 (-0700)
Subject: Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Tag: v4.19~214
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=225ad3cfec4c0ad1971b3c00f379986a3eb6ab07;hp=e0a0d05848401df48b10f3defce14a5670a0f9f6;p=platform%2Fkernel%2Flinux-rpi.git

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

Pull irqchip fix from Thomas Gleixner:
 "A single fix to prevent allocating excessive memory in the GIC/ITS
  driver.

  While the subject of the patch might suggest otherwise this is a real
  fix as some SoCs exceed the memory allocation limits and fail to boot"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/gic-v3-its: Cap lpi_id_bits to reduce memory footprint
---

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 316a575..c2df341 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1439,6 +1439,7 @@ static struct irq_chip its_irq_chip = {
  * The consequence of the above is that allocation is cost is low, but
  * freeing is expensive. We assumes that freeing rarely occurs.
  */
+#define ITS_MAX_LPI_NRBITS	16 /* 64K LPIs */
 
 static DEFINE_MUTEX(lpi_range_lock);
 static LIST_HEAD(lpi_range_list);
@@ -1625,7 +1626,8 @@ static int __init its_alloc_lpi_tables(void)
 {
 	phys_addr_t paddr;
 
-	lpi_id_bits = GICD_TYPER_ID_BITS(gic_rdists->gicd_typer);
+	lpi_id_bits = min_t(u32, GICD_TYPER_ID_BITS(gic_rdists->gicd_typer),
+				ITS_MAX_LPI_NRBITS);
 	gic_rdists->prop_page = its_allocate_prop_table(GFP_NOWAIT);
 	if (!gic_rdists->prop_page) {
 		pr_err("Failed to allocate PROPBASE\n");