linux-kernel - [PATCH v1] bluetooth: hci_qca: Fix suspend/resume functionality failure

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Message-Id: <1590662302-10102-1-git-send-email-zijuhu@codeaurora.org>
Date:   Thu, 28 May 2020 18:38:22 +0800
From:   Zijun Hu <zijuhu@...eaurora.org>
To:     marcel@...tmann.org, johan.hedberg@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, bgodavar@...eaurora.org,
        c-hbandi@...eaurora.org, hemantg@...eaurora.org, mka@...omium.org,
        rjliao@...eaurora.org, zijuhu@...eaurora.org
Subject: [PATCH v1] bluetooth: hci_qca: Fix suspend/resume functionality failure

@dev parameter of qca_suspend()/qca_resume() represents
serdev_device, but it is mistook for hci_dev and causes
succedent unexpected memory access.

Fix by taking @dev as serdev_device.

Signed-off-by: Zijun Hu <zijuhu@...eaurora.org>
---
 drivers/bluetooth/hci_qca.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index e4a6823..c159161 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1977,8 +1977,10 @@ static void qca_serdev_remove(struct serdev_device *serdev)
 
 static int __maybe_unused qca_suspend(struct device *dev)
 {
-	struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
-	struct hci_uart *hu = hci_get_drvdata(hdev);
+	struct serdev_device *serdev = to_serdev_device(dev);
+	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
+	struct hci_uart *hu = &qcadev->serdev_hu;
+	struct hci_dev *hdev __maybe_unused = hu->hdev;
 	struct qca_data *qca = hu->priv;
 	unsigned long flags;
 	int ret = 0;
@@ -2057,8 +2059,10 @@ static int __maybe_unused qca_suspend(struct device *dev)
 
 static int __maybe_unused qca_resume(struct device *dev)
 {
-	struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
-	struct hci_uart *hu = hci_get_drvdata(hdev);
+	struct serdev_device *serdev = to_serdev_device(dev);
+	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
+	struct hci_uart *hu = &qcadev->serdev_hu;
+	struct hci_dev *hdev __maybe_unused = hu->hdev;
 	struct qca_data *qca = hu->priv;
 
 	clear_bit(QCA_SUSPENDING, &qca->flags);
-- 
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