linux-kernel - [PATCH 2/6] ACPI/EC: Enhance the checks to apply to QR

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Date:	Mon,  3 Nov 2014 13:16:20 +0800
From:	Lv Zheng <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	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
Subject: [PATCH 2/6] ACPI/EC: Enhance the checks to apply to QR_EC transactions.

Currently a check is applied to new transactions, but QR_EC transactions
are not included. This patch merges the code path to make the check also
applying to the QR_EC transactions.

Signed-off-by: Lv Zheng <lv.zheng@...el.com>
Tested-by: Ortwin Glück <odi@....ch>
---
 drivers/acpi/ec.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 192cd11..9a51f7a 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -336,6 +336,10 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
 		udelay(ACPI_EC_MSI_UDELAY);
 	/* start transaction */
 	spin_lock_irqsave(&ec->lock, tmp);
+	if (!acpi_ec_started(ec)) {
+		ret = -EINVAL;
+		goto unlock;
+	}
 	/* following two actions should be kept atomic */
 	ec->curr = t;
 	pr_debug("***** Command(%s) started *****\n",
@@ -351,6 +355,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
 	pr_debug("***** Command(%s) stopped *****\n",
 		 acpi_ec_cmd_string(t->command));
 	ec->curr = NULL;
+unlock:
 	spin_unlock_irqrestore(&ec->lock, tmp);
 	return ret;
 }
@@ -365,10 +370,6 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
 	if (t->rdata)
 		memset(t->rdata, 0, t->rlen);
 	mutex_lock(&ec->mutex);
-	if (!acpi_ec_started(ec)) {
-		status = -EINVAL;
-		goto unlock;
-	}
 	if (ec->global_lock) {
 		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 		if (ACPI_FAILURE(status)) {
-- 
1.7.10

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