On Wed, 31 Aug 2016 10:44:01 -0500 Reza Arbab <ar...@linux.vnet.ibm.com> wrote:
> Attempting to online memory which is already online will cause this: > > 1. store_mem_state() called with buf="online" > 2. device_online() returns 1 because device is already online > 3. store_mem_state() returns 1 > 4. calling code interprets this as 1-byte buffer read > 5. store_mem_state() called again with buf="nline" > 6. store_mem_state() returns -EINVAL > > Example: > > $ cat /sys/devices/system/memory/memory0/state > online > $ echo online > /sys/devices/system/memory/memory0/state > -bash: echo: write error: Invalid argument > > Fix the return value of store_mem_state() so this doesn't happen. So.. what *does* happen after the patch? Is some sort of failure still reported? Or am I correct in believing that the operation will appear to have succeeded? If so, is that desirable?
