linux-kernel - [tip:x86/urgent] x86, intel-mid: Create IRQs for APB timers and RTC timers

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Date:	Tue, 28 Oct 2014 11:54:26 -0700
From:	tip-bot for Jiang Liu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	yinghai@...nel.org, konrad.wilk@...cle.com,
	linux-kernel@...r.kernel.org, david.a.cohen@...ux.intel.com,
	hpa@...or.com, bhelgaas@...gle.com, jiang.liu@...ux.intel.com,
	benh@...nel.crashing.org, rjw@...ysocki.net, bp@...en8.de,
	mingo@...nel.org, joro@...tes.org, rdunlap@...radead.org,
	tglx@...utronix.de, andriy.shevchenko@...ux.intel.com,
	tony.luck@...el.com, hpa@...ux.intel.com,
	gregkh@...uxfoundation.org
Subject: [tip:x86/urgent] x86, intel-mid:
  Create IRQs for APB timers and RTC timers

Commit-ID:  287d0625f072e78bb438e6a5f0cf106f9aa03d60
Gitweb:     http://git.kernel.org/tip/287d0625f072e78bb438e6a5f0cf106f9aa03d60
Author:     Jiang Liu <jiang.liu@...ux.intel.com>
AuthorDate: Mon, 27 Oct 2014 13:21:32 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 28 Oct 2014 19:50:50 +0100

x86, intel-mid: Create IRQs for APB timers and RTC timers

Intel MID platforms has no legacy interrupts, so no IRQ descriptors
preallocated. We need to call mp_map_gsi_to_irq() to create IRQ
descriptors for APB timers and RTC timers, otherwise it may cause
invalid memory access as:
[    0.116839] BUG: unable to handle kernel NULL pointer dereference at
0000003a
[    0.123803] IP: [<c1071c0e>] setup_irq+0xf/0x4d

Tested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: H. Peter Anvin <hpa@...ux.intel.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: David Cohen <david.a.cohen@...ux.intel.com>
Cc: <stable@...r.kernel.org> # 3.17
Link: http://lkml.kernel.org/r/1414387308-27148-3-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/apb_timer.c       | 2 --
 arch/x86/platform/intel-mid/sfi.c | 2 ++
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apb_timer.c b/arch/x86/kernel/apb_timer.c
index 5972b10..b708738 100644
--- a/arch/x86/kernel/apb_timer.c
+++ b/arch/x86/kernel/apb_timer.c
@@ -185,8 +185,6 @@ static void apbt_setup_irq(struct apbt_dev *adev)
 
 	irq_modify_status(adev->irq, 0, IRQ_MOVE_PCNTXT);
 	irq_set_affinity(adev->irq, cpumask_of(adev->cpu));
-	/* APB timer irqs are set up as mp_irqs, timer is edge type */
-	__irq_set_handler(adev->irq, handle_edge_irq, 0, "edge");
 }
 
 /* Should be called with per cpu */
diff --git a/arch/x86/platform/intel-mid/sfi.c b/arch/x86/platform/intel-mid/sfi.c
index 3c53a90..c14ad34 100644
--- a/arch/x86/platform/intel-mid/sfi.c
+++ b/arch/x86/platform/intel-mid/sfi.c
@@ -106,6 +106,7 @@ int __init sfi_parse_mtmr(struct sfi_table_header *table)
 			mp_irq.dstapic = MP_APIC_ALL;
 			mp_irq.dstirq = pentry->irq;
 			mp_save_irq(&mp_irq);
+			mp_map_gsi_to_irq(pentry->irq, IOAPIC_MAP_ALLOC);
 	}
 
 	return 0;
@@ -176,6 +177,7 @@ int __init sfi_parse_mrtc(struct sfi_table_header *table)
 		mp_irq.dstapic = MP_APIC_ALL;
 		mp_irq.dstirq = pentry->irq;
 		mp_save_irq(&mp_irq);
+		mp_map_gsi_to_irq(pentry->irq, IOAPIC_MAP_ALLOC);
 	}
 	return 0;
 }
--
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