linux-kernel - [PATCH 1/8] net: qualcomm: rmnet: fix struct rmnet_map

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Date:   Mon, 20 May 2019 08:53:47 -0500
From:   Alex Elder <elder@...aro.org>
To:     arnd@...db.de, subashab@...eaurora.org, david.brown@...aro.org,
        agross@...nel.org, davem@...emloft.net
Cc:     bjorn.andersson@...aro.org, ilias.apalodimas@...aro.org,
        cpratapa@...eaurora.org, syadagir@...eaurora.org,
        evgreen@...omium.org, benchan@...gle.com, ejcaruso@...gle.com,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/8] net: qualcomm: rmnet: fix struct rmnet_map_header

The C bit-fields in the first byte of the rmnet_map_header structure
are defined in the wrong order.  The first byte should be formatted
this way:
                 +------- reserved_bit
                 | +----- cd_bit
                 | |
                 v v
    +-----------+-+-+
    |  pad_len  |R|C|
    +-----------+-+-+
     7 6 5 4 3 2 1 0  <-- bit position

But the C bit-fields that define the first byte are defined this way:
    u8 pad_len:6;
    u8 reserved_bit:1;
    u8 cd_bit:1;

And although this isn't portable, I can state that when I build it
the result puts the bit-fields in the wrong location (e.g., the
cd_bit is in bit position 7, when it should be position 0).

Fix this by reordering the definitions of these struct members.
Upcoming patches will reimplement these definitions portably.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
index 884f1f52dcc2..b1ae9499c0b2 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
@@ -40,9 +40,9 @@ enum rmnet_map_commands {
 };
 
 struct rmnet_map_header {
-	u8  pad_len:6;
-	u8  reserved_bit:1;
 	u8  cd_bit:1;
+	u8  reserved_bit:1;
+	u8  pad_len:6;
 	u8  mux_id;
 	__be16 pkt_len;
 }  __aligned(1);
-- 
2.20.1