linux-kernel - [PATCH V5 1/2] ACPI / EC: Fix broken 64bit big-endian users of 'global

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Message-Id: <8d3d3428c3a36f821e4c3d8563d094ca4b4763fd.1443304934.git.viresh.kumar@linaro.org>
Date:	Sat, 26 Sep 2015 15:04:06 -0700
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linaro-kernel@...ts.linaro.org,
	QCA ath9k Development <ath9k-devel@....qualcomm.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-bluetooth@...r.kernel.org, iommu@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-edac@...r.kernel.org, linux-mm@...ck.org,
	alsa-devel@...a-project.org
Subject: [PATCH V5 1/2] ACPI / EC: Fix broken 64bit big-endian users of 'global_lock'

global_lock is defined as an unsigned long and accessing only its lower
32 bits from sysfs is incorrect, as we need to consider other 32 bits
for big endian 64-bit systems. There are no such platforms yet, but the
code needs to be robust for such a case.

Fix that by changing type of 'global_lock' to u32.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
BCC'd a lot of people (rather than cc'ing them) to make sure
- the series reaches them
- mailing lists do not block the patchset due to long cc list
- and we don't spam the BCC'd people for every reply

V4->V5:
- Switch back to the original solution of making global_lock u32.
---
 drivers/acpi/ec_sys.c   | 2 +-
 drivers/acpi/internal.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
index b4c216bab22b..bea8e425a8de 100644
--- a/drivers/acpi/ec_sys.c
+++ b/drivers/acpi/ec_sys.c
@@ -128,7 +128,7 @@ static int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
 	if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
 		goto error;
 	if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
-				 (u32 *)&first_ec->global_lock))
+				 &first_ec->global_lock))
 		goto error;
 
 	if (write_support)
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 9e426210c2a8..9db196de003c 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -138,7 +138,7 @@ struct acpi_ec {
 	unsigned long gpe;
 	unsigned long command_addr;
 	unsigned long data_addr;
-	unsigned long global_lock;
+	u32 global_lock;
 	unsigned long flags;
 	unsigned long reference_count;
 	struct mutex mutex;
-- 
2.4.0

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