XFS log warning "Writing back config space on device"

Hello.
I have formated one 300 GB partition in Linux OS, and then i worked whitout problems.
But, If I do a "dmesg" there is a warning error (i don´t know if is really a problem or maybe could cause problems in future):

SCSI device sdb: drive cache: write back
 sdb: sdb1
 ---

XFS mounting filesystem sdb1
Ending clean XFS mount for filesystem: sdb1
PM: Writing back config space on device 0000:05:02.0 at offset b (was 165314e4, writing 12bc103c)
PM: Writing back config space on device 0000:05:02.0 at offset 3 (was 0, writing 4010)
PM: Writing back config space on device 0000:05:02.0 at offset 2 (was 2000000, writing 2000003)
PM: Writing back config space on device 0000:05:02.0 at offset 1 (was 2b00000, writing 2b00106)
PM: Writing back config space on device 0000:05:02.0 at offset 0 (was 165314e4, writing 169614e4)

This partition allways was dismounted correctly, and there is low fragmentation.
I really don´t know if in the future I could have problems. Maybe there are any way to solve this warnings.

Thanks!!
Víctor Amil