linux-kernel - [Patch-next] ACPI, APEI: fix acpi_pre

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Date:	Mon, 06 Sep 2010 10:10:47 +0900
From:	Jin Dongming <jin.dongming@...css.fujitsu.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>, APEI-lenb <lenb@...nel.org>
CC:	Huang Ying <ying.huang@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	ACPI <linux-acpi@...r.kernel.org>,
	LKLM <linux-kernel@...r.kernel.org>
Subject: [Patch-next] ACPI, APEI: fix acpi_pre_map() return value.

After we ioremap() a new region, we call __acpi_try_ioremap() to
see whether another thread has already mapped the same region.
This check clobbers "vaddr",  so compute the return value of
acpi_pre_map() using the ioremap() result "map->vaddr" instead.

v2:
    Modified the unsuitable description of patch.

v3:
    Removed unlikely() check and made description simpler.

Signed-off-by: Jin Dongming <jin.dongming@...css.fujitsu.com>
Acked-by: Huang Ying <ying.huang@...el.com>

---
 drivers/acpi/atomicio.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/atomicio.c b/drivers/acpi/atomicio.c
index 8f8bd73..542e539 100644
--- a/drivers/acpi/atomicio.c
+++ b/drivers/acpi/atomicio.c
@@ -142,7 +142,7 @@ static void __iomem *acpi_pre_map(phys_addr_t paddr,
 	list_add_tail_rcu(&map->list, &acpi_iomaps);
 	spin_unlock_irqrestore(&acpi_iomaps_lock, flags);
 
-	return vaddr + (paddr - pg_off);
+	return map->vaddr + (paddr - map->paddr);
 err_unmap:
 	iounmap(vaddr);
 	return NULL;
-- 
1.7.1.1

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