Revision 2aa70f864955bf02362e3fb3008e4208d7a17a98 authored by Geert Uytterhoeven on 13 September 2017, 17:42:05 UTC, committed by David S. Miller on 15 September 2017, 21:24:49 UTC
If the network interface is kept running during suspend, the net core
may call net_device_ops.ndo_start_xmit() while the Ethernet device is
still suspended, which may lead to a system crash.
E.g. on sh73a0/kzm9g and r8a73a4/ape6evm, the external Ethernet chip is
driven by a PM controlled clock. If the Ethernet registers are accessed
while the clock is not running, the system will crash with an imprecise
external abort.
As this is a race condition with a small time window, it is not so easy
to trigger at will. Using pm_test may increase your chances:
# echo 0 > /sys/module/printk/parameters/console_suspend
# echo platform > /sys/power/pm_test
# echo mem > /sys/power/state
To fix this, make sure the network interface is quietened during
suspend.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 7095c97
| File | Mode | Size |
|---|---|---|
| postprocess | ||
| coresight-cpu-debug.txt | -rw-r--r-- | 8.0 KB |
| coresight.txt | -rw-r--r-- | 16.0 KB |
| events-kmem.txt | -rw-r--r-- | 5.3 KB |
| events-msr.txt | -rw-r--r-- | 700 bytes |
| events-nmi.txt | -rw-r--r-- | 1.5 KB |
| events-power.txt | -rw-r--r-- | 3.4 KB |
| events.txt | -rw-r--r-- | 100.0 KB |
| ftrace-design.txt | -rw-r--r-- | 14.5 KB |
| ftrace.txt | -rw-r--r-- | 119.3 KB |
| function-graph-fold.vim | -rw-r--r-- | 1.3 KB |
| hwlat_detector.txt | -rw-r--r-- | 3.8 KB |
| intel_th.txt | -rw-r--r-- | 4.7 KB |
| kprobetrace.txt | -rw-r--r-- | 7.5 KB |
| mmiotrace.txt | -rw-r--r-- | 6.6 KB |
| ring-buffer-design.txt | -rw-r--r-- | 29.9 KB |
| stm.txt | -rw-r--r-- | 5.5 KB |
| tracepoint-analysis.txt | -rw-r--r-- | 12.0 KB |
| tracepoints.txt | -rw-r--r-- | 5.1 KB |
| uprobetracer.txt | -rw-r--r-- | 6.6 KB |
Computing file changes ...
