From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- Documentation/admin-guide/media/ci.rst | 77 ++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 Documentation/admin-guide/media/ci.rst (limited to 'Documentation/admin-guide/media/ci.rst') diff --git a/Documentation/admin-guide/media/ci.rst b/Documentation/admin-guide/media/ci.rst new file mode 100644 index 000000000..ded4d8fbb --- /dev/null +++ b/Documentation/admin-guide/media/ci.rst @@ -0,0 +1,77 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Digital TV Conditional Access Interface +======================================= + + +.. note:: + + This documentation is outdated. + +This document describes the usage of the high level CI API as +in accordance to the Linux DVB API. This is a not a documentation for the, +existing low level CI API. + +.. note:: + + For the Twinhan/Twinhan clones, the dst_ca module handles the CI + hardware handling. This module is loaded automatically if a CI + (Common Interface, that holds the CAM (Conditional Access Module) + is detected. + +ca_zap +~~~~~~ + +A userspace application, like ``ca_zap`` is required to handle encrypted +MPEG-TS streams. + +The ``ca_zap`` userland application is in charge of sending the +descrambling related information to the Conditional Access Module (CAM). + +This application requires the following to function properly as of now. + +a) Tune to a valid channel, with szap. + + eg: $ szap -c channels.conf -r "TMC" -x + +b) a channels.conf containing a valid PMT PID + + eg: TMC:11996:h:0:27500:278:512:650:321 + + here 278 is a valid PMT PID. the rest of the values are the + same ones that szap uses. + +c) after running a szap, you have to run ca_zap, for the + descrambler to function, + + eg: $ ca_zap channels.conf "TMC" + +d) Hopefully enjoy your favourite subscribed channel as you do with + a FTA card. + +.. note:: + + Currently ca_zap, and dst_test, both are meant for demonstration + purposes only, they can become full fledged applications if necessary. + + +Cards that fall in this category +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +At present the cards that fall in this category are the Twinhan and its +clones, these cards are available as VVMER, Tomato, Hercules, Orange and +so on. + +CI modules that are supported +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The CI module support is largely dependent upon the firmware on the cards +Some cards do support almost all of the available CI modules. There is +nothing much that can be done in order to make additional CI modules +working with these cards. + +Modules that have been tested by this driver at present are + +(1) Irdeto 1 and 2 from SCM +(2) Viaccess from SCM +(3) Dragoncam -- cgit v1.3.1