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Date: Mon, 20 May 2019 08:38:47 -0700 From: Bjorn Andersson <bjorn.andersson@...aro.org> To: Alex Elder <elder@...aro.org> Cc: arnd@...db.de, subashab@...eaurora.org, david.brown@...aro.org, agross@...nel.org, davem@...emloft.net, 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: Re: [PATCH 1/8] net: qualcomm: rmnet: fix struct rmnet_map_header On Mon 20 May 06:53 PDT 2019, Alex Elder wrote: > 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. > Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org> Regards, Bjorn > 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 >
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