linux-kernel - [PATCH 2/5] ACPI / debugger: Fix regressions that AML debugger stops working

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Message-Id: <c42921c3de9a94fcff97a2de7ac5599cc38ec41f.1467717305.git.lv.zheng@intel.com>
Date:	Tue,  5 Jul 2016 19:18:07 +0800
From:	Lv Zheng <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>
Cc:	Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>,
	<linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 2/5] ACPI / debugger: Fix regressions that AML debugger stops working

The FIFO unlocking mechanism in acpi_dbg has been messed up by the
following commit:
  Commit: 287980e49ffc0f6d911601e7e352a812ed27768e
  Subject: remove lots of IS_ERR_VALUE abuses
It converts !IS_ERR_VALUE(ret) into !ret. This patch fixes the
regression.

Fixes: 287980e49ffc ("remove lots of IS_ERR_VALUE abuses")
Signed-off-by: Lv Zheng <lv.zheng@...el.com>
Cc: Arnd Bergmann <arnd@...db.de>
---
 drivers/acpi/acpi_dbg.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/acpi_dbg.c b/drivers/acpi/acpi_dbg.c
index 1f41284..ebc8d18 100644
--- a/drivers/acpi/acpi_dbg.c
+++ b/drivers/acpi/acpi_dbg.c
@@ -602,7 +602,8 @@ static int acpi_aml_read_user(char __user *buf, int len)
 	crc->tail = (crc->tail + n) & (ACPI_AML_BUF_SIZE - 1);
 	ret = n;
 out:
-	acpi_aml_unlock_fifo(ACPI_AML_OUT_USER, !ret);
+	acpi_aml_unlock_fifo(ACPI_AML_OUT_USER,
+			     ret < 0 ? false : true);
 	return ret;
 }
 
@@ -672,7 +673,8 @@ static int acpi_aml_write_user(const char __user *buf, int len)
 	crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);
 	ret = n;
 out:
-	acpi_aml_unlock_fifo(ACPI_AML_IN_USER, !ret);
+	acpi_aml_unlock_fifo(ACPI_AML_IN_USER,
+			     ret < 0 ? false : true);
 	return n;
 }
 
-- 
1.7.10