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tty: n_gsm: clean up implicit CR bit encoding in address field

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n_gsm is based on the 3GPP 07.010 and its newer version is the 3GPP 27.010.
See https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1516
The changes from 07.010 to 27.010 are non-functional. Therefore, I refer to
the newer 27.010 here. Chapter 5.2.1.2 describes the encoding of the
address field within the frame header. It is made up of the DLCI address,
command/response (CR) bit and EA bit.
Use the predefined CR value instead of a plain 2 in alignment to the
remaining code and to make the encoding obvious.

Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220420101346.3315-3-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Starke 2022-04-20 03:13:46 -07:00 committed by Greg Kroah-Hartman
parent 538668d7d2
commit 8712777384
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/n_gsm.c
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@ -749,7 +749,7 @@ static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
*--dp = msg->ctrl;
if (gsm->initiator)
*--dp = (msg->addr << 2) | 2 | EA;
*--dp = (msg->addr << 2) | CR | EA;
else
*--dp = (msg->addr << 2) | EA;
*fcs = gsm_fcs_add_block(INIT_FCS, dp , msg->data - dp);