linux-kernel - Re: [PATCH 4/4] ibmvfc: store return code of H_FREE_SUB

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Message-ID: <f5821413-f390-f759-a8a4-764c7f69537c@linux.ibm.com>
Date:   Tue, 16 Feb 2021 10:43:24 -0800
From:   Tyrel Datwyler <tyreld@...ux.ibm.com>
To:     Brian King <brking@...ux.vnet.ibm.com>,
        james.bottomley@...senpartnership.com
Cc:     martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        brking@...ux.ibm.com
Subject: Re: [PATCH 4/4] ibmvfc: store return code of H_FREE_SUB_CRQ during
 cleanup

On 2/16/21 6:58 AM, Brian King wrote:
> On 2/11/21 12:57 PM, Tyrel Datwyler wrote:
>> diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
>> index ba6fcf9cbc57..23b803ac4a13 100644
>> --- a/drivers/scsi/ibmvscsi/ibmvfc.c
>> +++ b/drivers/scsi/ibmvscsi/ibmvfc.c
>> @@ -5670,7 +5670,7 @@ static int ibmvfc_register_scsi_channel(struct ibmvfc_host *vhost,
>>  
>>  irq_failed:
>>  	do {
>> -		plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
>> +		rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
>>  	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
> 
> Other places in the driver where we get a busy return code back we have an msleep(100).
> Should we be doing that here as well?

Indeed, and actually even better would be to use rtas_busy_delay() which will
perform the sleep with the correct ms delay, and marks itself with the
might_sleep() macro.

-Tyrel

> 
> Thanks,
> 
> Brian
>