On 17 July 2017 at 18:18, Evangelos Foutras <evangelos@xxxxxxxxxxxxx> wrote: > On 17/07/17 10:53, Christoph Hellwig wrote: >> But I did some audit of the code, and it seems blk-mq is lacking >> support for the RQF_PM flag. While I can't directly see how >> this would cause the hang your caused it's a least easy to test. >> >> Can you apply the patch below and test with the use_blk_mq=0 parameter? > > I think the patch needs to be tested with scsi_mod.use_blk_mq=1 (which I > will try to do and report back). I briefly tested the patch (on top of Linux 4.12.2) and it appears to successfully work around the issue; my laptop happily resumes from S3 and can access the HDD.
