[FS#1416] WiFi cannot up on Comfast E355AC v2(patch file for fix this attached too)

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - michaeliu (michaeliu) 

Attached to Project - OpenWrt/LEDE Project
Summary - WiFi cannot up on Comfast E355AC v2(patch file for fix this attached too)
Task Type - Bug Report
Category - Packages
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - Hi,

Device problem occurs on: 
    Comfast-EA355AC-V2 (QCA9531 + QCA9886)

Software versions:
    LEDE v17.01.4
    netifd: c92106e3048ae10cb04a7c7303ba5f53bc057953

Steps to reproduce:
    It need to continuely reset to factory default and reboot.

When it occurs, system boot up successful. but wireless interface will setup and teardown for several times and wireless interface will disappear in the final.
After i dived into the code, I found that, check_pid_path() @177 of utils.c of netifd project will report process(hostapd) dead when system booting up during pivot_root processing.
the result of readlink of "/proc/PID/exe" will return the execution file name with "/tmp/root" as prefix(maybe something other too).
So I am trying to fix it by the patch file attached.

Please review and merge into master if it looks good.

Sorry for my bad english.

And thanks in advance.

Best Regards,
Michael  


 

One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1416