linux-kernel - [ 33/42] Revert "x86/ioapic: Add register level checks to detect bogus io-apic entries"

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Message-Id: <20120411231313.214447921@linuxfoundation.org>
Date:	Wed, 11 Apr 2012 16:13:40 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jon Dufresne <jon@...dufresne.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	<yinghai@...nel.org>, Josh Boyer <jwboyer@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Teck Choon Giam <giamteckchoon@...il.com>,
	Ben Guthro <ben@...hro.net>
Subject: [ 33/42] Revert "x86/ioapic: Add register level checks to detect bogus io-apic entries"

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

This reverts commit c2ec63edaf48c90c3495eeb0b75bb05102fbf71a
[73d63d038ee9f769f5e5b46792d227fe20e442c5 upstream]

It causes problems, so needs to be reverted from 3.2-stable for now.

Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Jon Dufresne <jon@...dufresne.org>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
Cc: <yinghai@...nel.org>
Cc: Josh Boyer <jwboyer@...hat.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Teck Choon Giam <giamteckchoon@...il.com>
Cc: Ben Guthro <ben@...hro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/apic/io_apic.c |   40 ++++++++--------------------------------
 1 file changed, 8 insertions(+), 32 deletions(-)

--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3927,36 +3927,18 @@ int mp_find_ioapic_pin(int ioapic, u32 g
 static __init int bad_ioapic(unsigned long address)
 {
 	if (nr_ioapics >= MAX_IO_APICS) {
-		pr_warn("WARNING: Max # of I/O APICs (%d) exceeded (found %d), skipping\n",
-			MAX_IO_APICS, nr_ioapics);
+		printk(KERN_WARNING "WARNING: Max # of I/O APICs (%d) exceeded "
+		       "(found %d), skipping\n", MAX_IO_APICS, nr_ioapics);
 		return 1;
 	}
 	if (!address) {
-		pr_warn("WARNING: Bogus (zero) I/O APIC address found in table, skipping!\n");
+		printk(KERN_WARNING "WARNING: Bogus (zero) I/O APIC address"
+		       " found in table, skipping!\n");
 		return 1;
 	}
 	return 0;
 }
 
-static __init int bad_ioapic_register(int idx)
-{
-	union IO_APIC_reg_00 reg_00;
-	union IO_APIC_reg_01 reg_01;
-	union IO_APIC_reg_02 reg_02;
-
-	reg_00.raw = io_apic_read(idx, 0);
-	reg_01.raw = io_apic_read(idx, 1);
-	reg_02.raw = io_apic_read(idx, 2);
-
-	if (reg_00.raw == -1 && reg_01.raw == -1 && reg_02.raw == -1) {
-		pr_warn("I/O APIC 0x%x registers return all ones, skipping!\n",
-			mpc_ioapic_addr(idx));
-		return 1;
-	}
-
-	return 0;
-}
-
 void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
 {
 	int idx = 0;
@@ -3973,12 +3955,6 @@ void __init mp_register_ioapic(int id, u
 	ioapics[idx].mp_config.apicaddr = address;
 
 	set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
-
-	if (bad_ioapic_register(idx)) {
-		clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
-		return;
-	}
-
 	ioapics[idx].mp_config.apicid = io_apic_unique_id(id);
 	ioapics[idx].mp_config.apicver = io_apic_get_version(idx);
 
@@ -3999,10 +3975,10 @@ void __init mp_register_ioapic(int id, u
 	if (gsi_cfg->gsi_end >= gsi_top)
 		gsi_top = gsi_cfg->gsi_end + 1;
 
-	pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n",
-		idx, mpc_ioapic_id(idx),
-		mpc_ioapic_ver(idx), mpc_ioapic_addr(idx),
-		gsi_cfg->gsi_base, gsi_cfg->gsi_end);
+	printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
+	       "GSI %d-%d\n", idx, mpc_ioapic_id(idx),
+	       mpc_ioapic_ver(idx), mpc_ioapic_addr(idx),
+	       gsi_cfg->gsi_base, gsi_cfg->gsi_end);
 
 	nr_ioapics++;
 }


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