linux-kernel - Re: [PATCH v3] scsi: core: Fix shost->cmd_per_lun calculation in scsi_add_host_with

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Date:   Tue, 12 Oct 2021 12:41:48 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     kys@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        haiyangz@...rosoft.com, ming.lei@...hat.com, bvanassche@....org,
        john.garry@...wei.com, linux-scsi@...r.kernel.org,
        linux-hyperv@...r.kernel.org, longli@...rosoft.com,
        mikelley@...rosoft.com, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v3] scsi: core: Fix shost->cmd_per_lun calculation in
 scsi_add_host_with_dma()


Dexuan,

> After commit ea2f0f77538c, a 416-CPU VM running on Hyper-V hangs during
> boot because the hv_storvsc driver sets scsi_driver.can_queue to an "int"
> value that exceeds SHRT_MAX, and hence scsi_add_host_with_dma() sets
> shost->cmd_per_lun to a negative "short" value.
>
> Use min_t(int, ...) to fix the issue.

I queued this up as a short term workaround. However, I am hoping that
the rework of the scaling code in storvsc lands soon.

-- 
Martin K. Petersen	Oracle Linux Engineering