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Ping-Ke Shih 7994e88dab wifi: rtw89: pci: correct TX resource checking for PCI DMA channel of firmware command 
commit c6330b1297 upstream.

The DMA channel of firmware command doesn't use TX WD (WiFi descriptor), so
don't need to consider number of TX WD as factor of TX resource. Otherwise,
during pause state (a transient state to switch to/from low power mode)
firmware commands could be dropped and driver throws warnings suddenly:

   rtw89_8852ce 0000:04:00.0: no tx fwcmd resource
   rtw89_8852ce 0000:04:00.0: failed to send h2c

The case we met is that driver sends RSSI strength of firmware command at
RX path that could be running concurrently with switching low power mode.
The missing of this firmware command doesn't affect user experiences,
because the RSSI strength will be updated again after a while.

The DMA descriptors of normal packets has three layers like:

  +-------+
  | TX BD | (*n elements)
  +-------+
      |
      |   +-------+
      +-> | TX WD | (*m elements)
          +-------+
              |
              |   +--------+
              +-> |   SKB  |
                  +--------+

And, firmware command queue (TXCH 12) is a special queue that has only
two layers:

  +-------+
  | TX BD | (*n elements)
  +-------+
      |
      |   +------------------+
      +-> | firmware command |
          +------------------+

Fixes: 4a29213cd7 ("wifi: rtw89: pci: correct TX resource checking in low power mode")
Cc: stable@vger.kernel.org
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/20240410011316.9906-1-pkshih@realtek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-06-16 13:47:34 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.