Re: [PATCH] scsi: sd_zbc: update write pointer offset cache

[Bart Van Assche <bvanassche@xxxxxxx>]

On 3/11/21 7:54 AM, Johannes Thumshirn wrote:
> Yes I've looked at the commits in mpt3sas, but can't really pinpoint the 
> offending commit TBH. 664f0dce2058 ("scsi: mpt3sas: Add support for shared 
> host tagset for CPU hotplug") is the only one that /looks/ as if it could
> be causing it, but I don't know mpt3sas well enough.
> 
> FWIW added Sreekanth

Hi Johannes,

I'd like to see a full root-cause analysis before proceeding with this
patch because as far as I can see the call chain for
scsi_finish_command() is as follows (entirely in soft-IRQ context):

blk_done_softirq()
  blk_complete_reqs()
    scsi_softirq_done()
      scsi_finish_command()

Thanks,

Bart.