linux-kernel - Excessive logging in thunderbolt driver

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Date:   Tue, 31 Oct 2017 22:45:46 +0100
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     andreas.noever@...il.com, michael.jamet@...el.com,
        mika.westerberg@...ux.intel.com, yehezkel.bernat@...el.com
Cc:     linux-kernel@...r.kernel.org
Subject: Excessive logging in thunderbolt driver

The thunderbolt driver needs to stop logging.
All these debug messages and the laptop is on battery with no devices connected.
(I did use a USB key, but that is not a thunderbolt device).

IMHO a production driver should log nothing in normal operation.
If you insist, the one message when device is found on discovery/probe
is allowed at INFO level.

All the rest should just go away, or be turned into pr_debug().


$ dmesg  | grep thunderbolt

[   28.979485] thunderbolt 0000:03:00.0: NHI initialized, starting thunderbolt
[   28.979490] thunderbolt 0000:03:00.0: allocating TX ring 0 of size 10
[   28.979518] thunderbolt 0000:03:00.0: allocating RX ring 0 of size 10
[   28.979532] thunderbolt 0000:03:00.0: control channel created
[   28.979533] thunderbolt 0000:03:00.0: control channel starting...
[   28.979534] thunderbolt 0000:03:00.0: starting TX ring 0
[   28.979541] thunderbolt 0000:03:00.0: enabling interrupt at register 0x38200 bit 0 (0x0 -> 0x1)
[   28.979542] thunderbolt 0000:03:00.0: starting RX ring 0
[   28.979549] thunderbolt 0000:03:00.0: enabling interrupt at register 0x38200 bit 12 (0x1 -> 0x1001)
[   29.077877] thunderbolt 0000:03:00.0: current switch config:
[   29.077880] thunderbolt 0000:03:00.0:  Switch: 8086:1576 (Revision: 4, TB Version: 2)
[   29.077882] thunderbolt 0000:03:00.0:   Max Port Number: 11
[   29.077882] thunderbolt 0000:03:00.0:   Config:
[   29.077884] thunderbolt 0000:03:00.0:    Upstream Port Number: 5 Depth: 0 Route String: 0x0 Enabled: 1, PlugEventsDelay: 254ms
[   29.077885] thunderbolt 0000:03:00.0:    unknown1: 0x0 unknown4: 0x0
[   29.089024] thunderbolt 0000:03:00.0: 0: uid: 0xd45fb028d06d00
[   29.089427] thunderbolt 0000:03:00.0:  Port 0: 8086:1576 (Revision: 4, TB Version: 1, Type: Port (0x1))
[   29.089428] thunderbolt 0000:03:00.0:   Max hop id (in/out): 7/7
[   29.089429] thunderbolt 0000:03:00.0:   Max counters: 8
[   29.089430] thunderbolt 0000:03:00.0:   NFC Credits: 0x800000
[   29.089578] thunderbolt 0000:03:00.0:  Port 1: 8086:1576 (Revision: 4, TB Version: 1, Type: Port (0x1))
[   29.089579] thunderbolt 0000:03:00.0:   Max hop id (in/out): 15/15
[   29.089580] thunderbolt 0000:03:00.0:   Max counters: 16
[   29.089580] thunderbolt 0000:03:00.0:   NFC Credits: 0x3c00000
[   29.089724] thunderbolt 0000:03:00.0:  Port 2: 8086:1576 (Revision: 4, TB Version: 1, Type: Port (0x1))
[   29.089725] thunderbolt 0000:03:00.0:   Max hop id (in/out): 15/15
[   29.089726] thunderbolt 0000:03:00.0:   Max counters: 16
[   29.089727] thunderbolt 0000:03:00.0:   NFC Credits: 0x3c00000
[   29.089728] thunderbolt 0000:03:00.0: 0:3: disabled by eeprom
[   29.089729] thunderbolt 0000:03:00.0: 0:4: disabled by eeprom
[   29.089730] thunderbolt 0000:03:00.0: 0:5: disabled by eeprom
[   29.089775] thunderbolt 0000:03:00.0:  Port 6: 8086:1576 (Revision: 4, TB Version: 1, Type: PCIe (0x100101))
[   29.089776] thunderbolt 0000:03:00.0:   Max hop id (in/out): 8/8
[   29.089776] thunderbolt 0000:03:00.0:   Max counters: 2
[   29.089777] thunderbolt 0000:03:00.0:   NFC Credits: 0x800000
[   29.089827] thunderbolt 0000:03:00.0:  Port 7: 8086:1576 (Revision: 4, TB Version: 1, Type: PCIe (0x100101))
[   29.089828] thunderbolt 0000:03:00.0:   Max hop id (in/out): 8/8
[   29.089828] thunderbolt 0000:03:00.0:   Max counters: 2
[   29.089829] thunderbolt 0000:03:00.0:   NFC Credits: 0x800000
[   29.089830] thunderbolt 0000:03:00.0: 0:8: disabled by eeprom
[   29.089831] thunderbolt 0000:03:00.0: 0:9: disabled by eeprom
[   29.089873] thunderbolt 0000:03:00.0:  Port 10: 8086:1576 (Revision: 4, TB Version: 1, Type: DP/HDMI (0xe0101))
[   29.089874] thunderbolt 0000:03:00.0:   Max hop id (in/out): 9/9
[   29.089875] thunderbolt 0000:03:00.0:   Max counters: 2
[   29.089875] thunderbolt 0000:03:00.0:   NFC Credits: 0x1000000
[   29.089876] thunderbolt 0000:03:00.0: 0:b: disabled by eeprom
[   34.424927] thunderbolt 0000:03:00.0: stopping RX ring 0
[   34.424938] thunderbolt 0000:03:00.0: disabling interrupt at register 0x38200 bit 12 (0xffffffff -> 0xffffefff)
[   34.424947] thunderbolt 0000:03:00.0: stopping TX ring 0
[   34.424954] thunderbolt 0000:03:00.0: disabling interrupt at register 0x38200 bit 0 (0xffffffff -> 0xfffffffe)
[   34.424957] thunderbolt 0000:03:00.0: control channel stopped
[   34.425330] thunderbolt 0000:03:00.0: freeing RX ring 0
[   34.425342] thunderbolt 0000:03:00.0: freeing TX ring 0
[   34.425351] thunderbolt 0000:03:00.0: shutdown