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Revision 7ff57e98fb78ad94edafbdc7435f2d745e9e6bb5 authored by Fabio M. De Francesco on 23 February 2022, 10:02:52 UTC, committed by Jakub Kicinski on 24 February 2022, 17:09:33 UTC 
net/smc: Use a mutex for locking "struct smc_pnettable"
 
smc_pnetid_by_table_ib() uses read_lock() and then it calls smc_pnet_apply_ib()
which, in turn, calls mutex_lock(&smc_ib_devices.mutex).

read_lock() disables preemption. Therefore, the code acquires a mutex while in
atomic context and it leads to a SAC bug.

Fix this bug by replacing the rwlock with a mutex.

Reported-and-tested-by: syzbot+4f322a6d84e991c38775@syzkaller.appspotmail.com
Fixes: 64e28b52c7a6 ("net/smc: add pnet table namespace support")
Confirmed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220223100252.22562-1-fmdefrancesco@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Raw File
ir38064.rst 
Kernel driver ir38064
=====================

Supported chips:

  * Infineon IR38060

    Prefix: 'IR38060'
    Addresses scanned: -

    Datasheet: Publicly available at the Infineon website
      https://www.infineon.com/dgdl/Infineon-IR38060M-DS-v03_16-EN.pdf?fileId=5546d4625c167129015c3291ea9a4cee

  * Infineon IR38064

    Prefix: 'ir38064'
    Addresses scanned: -

    Datasheet: Publicly available at the Infineon website
      https://www.infineon.com/dgdl/Infineon-IR38064MTRPBF-DS-v03_07-EN.pdf?fileId=5546d462584d1d4a0158db0d9efb67ca

  * Infineon IR38164

    Prefix: 'ir38164'
    Addresses scanned: -

    Datasheet: Publicly available at the Infineon website
      https://www.infineon.com/dgdl/Infineon-IR38164M-DS-v02_02-EN.pdf?fileId=5546d462636cc8fb01640046efea1248

  * Infineon ir38263

    Prefix: 'ir38263'
    Addresses scanned: -

    Datasheet:  Publicly available at the Infineon website
      https://www.infineon.com/dgdl/Infineon-IR38263M-DataSheet-v03_05-EN.pdf?fileId=5546d4625b62cd8a015bcf81f90a6e52

Authors:
      - Maxim Sloyko <maxims@google.com>
      - Patrick Venture <venture@google.com>

Description
-----------

IR38x6x are a Single-input Voltage, Synchronous Buck Regulator, DC-DC Converter.

Usage Notes
-----------

This driver does not probe for PMBus devices. You will have to instantiate
devices explicitly.

Sysfs attributes
----------------

======================= ===========================
curr1_label		"iout1"
curr1_input		Measured output current
curr1_crit		Critical maximum current
curr1_crit_alarm	Current critical high alarm
curr1_max		Maximum current
curr1_max_alarm		Current high alarm

in1_label		"vin"
in1_input		Measured input voltage
in1_crit		Critical maximum input voltage
in1_crit_alarm		Input voltage critical high alarm
in1_min			Minimum input voltage
in1_min_alarm		Input voltage low alarm

in2_label		"vout1"
in2_input		Measured output voltage
in2_lcrit		Critical minimum output voltage
in2_lcrit_alarm		Output voltage critical low alarm
in2_crit		Critical maximum output voltage
in2_crit_alarm		Output voltage critical high alarm
in2_max			Maximum output voltage
in2_max_alarm		Output voltage high alarm
in2_min			Minimum output voltage
in2_min_alarm		Output voltage low alarm

power1_label		"pout1"
power1_input		Measured output power

temp1_input		Measured temperature
temp1_crit		Critical high temperature
temp1_crit_alarm	Chip temperature critical high alarm
temp1_max		Maximum temperature
temp1_max_alarm		Chip temperature high alarm
======================= ===========================
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