linux-kernel - [PATCH v2 12/17] staging: wfx: fix endianness of the struct hif_ind

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Message-Id: <20200512150414.267198-13-Jerome.Pouiller@silabs.com>
Date:   Tue, 12 May 2020 17:04:09 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH v2 12/17] staging: wfx: fix endianness of the struct hif_ind_startup

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

The struct hif_ind_startup is received from the hardware. So it is
declared as little endian. However, it is also stored in the main driver
structure and used on different places in the driver. Sparse complains
about that:

    drivers/staging/wfx/data_tx.c:388:43: warning: restricted __le16 degrades to integer
    drivers/staging/wfx/bh.c:199:9: warning: restricted __le16 degrades to integer
    drivers/staging/wfx/bh.c:221:62: warning: restricted __le16 degrades to integer

In order to make Sparse happy and to keep access from the driver easy,
this patch declare hif_ind_startup with native endianness.

On reception of this struct, this patch takes care to do byte-swap and
keep Sparse happy.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/hif_api_general.h | 11 +++++++----
 drivers/staging/wfx/hif_rx.c          |  8 ++++----
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/wfx/hif_api_general.h b/drivers/staging/wfx/hif_api_general.h
index f0135d27120c..995752b9f168 100644
--- a/drivers/staging/wfx/hif_api_general.h
+++ b/drivers/staging/wfx/hif_api_general.h
@@ -136,12 +136,15 @@ struct hif_otp_phy_info {
 } __packed;
 
 struct hif_ind_startup {
+	// As the others, this struct is interpreted as little endian by the
+	// device. However, this struct is also used by the driver. We prefer to
+	// declare it in native order and doing byte swap on reception.
 	__le32 status;
-	__le16 hardware_id;
+	u16    hardware_id;
 	u8     opn[14];
 	u8     uid[8];
-	__le16 num_inp_ch_bufs;
-	__le16 size_inp_ch_buf;
+	u16    num_inp_ch_bufs;
+	u16    size_inp_ch_buf;
 	u8     num_links_ap;
 	u8     num_interfaces;
 	u8     mac_addr[2][ETH_ALEN];
@@ -155,7 +158,7 @@ struct hif_ind_startup {
 	u8     disabled_channel_list[2];
 	struct hif_otp_regul_sel_mode_info regul_sel_mode_info;
 	struct hif_otp_phy_info otp_phy_info;
-	__le32 supported_rate_mask;
+	u32    supported_rate_mask;
 	u8     firmware_label[128];
 } __packed;
 
diff --git a/drivers/staging/wfx/hif_rx.c b/drivers/staging/wfx/hif_rx.c
index fca9df620ad9..9b4f0c4ba745 100644
--- a/drivers/staging/wfx/hif_rx.c
+++ b/drivers/staging/wfx/hif_rx.c
@@ -100,10 +100,10 @@ static int hif_startup_indication(struct wfx_dev *wdev,
 		return -EINVAL;
 	}
 	memcpy(&wdev->hw_caps, body, sizeof(struct hif_ind_startup));
-	le32_to_cpus(&wdev->hw_caps.status);
-	le16_to_cpus(&wdev->hw_caps.hardware_id);
-	le16_to_cpus(&wdev->hw_caps.num_inp_ch_bufs);
-	le16_to_cpus(&wdev->hw_caps.size_inp_ch_buf);
+	le16_to_cpus((__le16 *)&wdev->hw_caps.hardware_id);
+	le16_to_cpus((__le16 *)&wdev->hw_caps.num_inp_ch_bufs);
+	le16_to_cpus((__le16 *)&wdev->hw_caps.size_inp_ch_buf);
+	le32_to_cpus((__le32 *)&wdev->hw_caps.supported_rate_mask);
 
 	complete(&wdev->firmware_ready);
 	return 0;
-- 
2.26.2