linux-kernel - [PATCH 3.16 005/212] rtlwifi: Fix alignment issues

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Date:   Thu, 01 Jun 2017 16:43:15 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Ping-Ke Shih" <pkshih@...ltek.com>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Larry Finger" <Larry.Finger@...inger.net>
Subject: [PATCH 3.16 005/212] rtlwifi: Fix alignment issues

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ping-Ke Shih <pkshih@...ltek.com>

commit 40b368af4b750863b2cb66a3a9513241db2f0793 upstream.

The addresses of Wlan NIC registers are natural alignment, but some
drivers have bugs. These are evident on platforms that need natural
alignment to access registers.  This change contains the following:
 1. Function _rtl8821ae_dbi_read() is used to read one byte from DBI,
    thus it should use rtl_read_byte().
 2. Register 0x4C7 of 8192ee is single byte.

Signed-off-by: Ping-Ke Shih <pkshih@...ltek.com>
Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
[bwh: Backported to 3.16: adjust filenames]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/staging/rtl8192ee/rtl8192ee/hw.c
+++ b/drivers/staging/rtl8192ee/rtl8192ee/hw.c
@@ -1006,7 +1006,7 @@ static void _rtl92ee_hw_configure(struct
 	rtl_write_word(rtlpriv, REG_SIFS_TRX, 0x100a);
 
 	/* Note Data sheet don't define */
-	rtl_write_word(rtlpriv, 0x4C7, 0x80);
+	rtl_write_byte(rtlpriv, 0x4C7, 0x80);
 
 	rtl_write_byte(rtlpriv, REG_RX_PKT_LIMIT, 0x20);
 
--- a/drivers/staging/rtl8821ae/rtl8821ae/hw.c
+++ b/drivers/staging/rtl8821ae/rtl8821ae/hw.c
@@ -1098,7 +1098,7 @@ static u8 _rtl8821ae_dbi_read(struct rtl
 	}
 	if (0 == tmp) {
 		read_addr = REG_DBI_RDATA + addr % 4;
-		ret = rtl_read_word(rtlpriv, read_addr);
+		ret = rtl_read_byte(rtlpriv, read_addr);
 	}
 	return ret;
 }