linux-kernel - [PATCH] staging: fusb302: don't bitshift _

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Date:   Fri, 16 Jun 2017 19:45:56 +0200
From:   Frans Klaver <fransklaver@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Frans Klaver <fransklaver@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Yueyao Zhu <yueyao.zhu@...il.com>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Guru Das Srinagesh <gurooodas@...il.com>,
        Javier Martinez Canillas <javier@...hile0.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: fusb302: don't bitshift __le16 type

The header field in struct pd_message is declared as an __le16 type. The
data in the message is supposed to be little endian. This means we don't
have to go and shift the individual bytes into position when we're
filling the buffer, we can just copy the contents right away. As an
added benefit we don't get fishy results on big endian systems anymore.

Signed-off-by: Frans Klaver <fransklaver@...il.com>
---
 drivers/staging/typec/fusb302/fusb302.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/typec/fusb302/fusb302.c b/drivers/staging/typec/fusb302/fusb302.c
index 4a356e509fe4..03a3809d18f0 100644
--- a/drivers/staging/typec/fusb302/fusb302.c
+++ b/drivers/staging/typec/fusb302/fusb302.c
@@ -1039,8 +1039,8 @@ static int fusb302_pd_send_message(struct fusb302_chip *chip,
 	}
 	/* packsym tells the FUSB302 chip that the next X bytes are payload */
 	buf[pos++] = FUSB302_TKN_PACKSYM | (len & 0x1F);
-	buf[pos++] = msg->header & 0xFF;
-	buf[pos++] = (msg->header >> 8) & 0xFF;
+	memcpy(&buf[pos], &msg->header, sizeof(msg->header));
+	pos += sizeof(msg->header);
 
 	len -= 2;
 	memcpy(&buf[pos], msg->payload, len);
-- 
2.13.0