linux-kernel - [PATCH v5 4/5] ibmvfc: store return code of H_FREE_SUB

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Date:   Tue,  2 Mar 2021 17:05:42 -0600
From:   Tyrel Datwyler <tyreld@...ux.ibm.com>
To:     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, Tyrel Datwyler <tyreld@...ux.ibm.com>
Subject: [PATCH v5 4/5] ibmvfc: store return code of H_FREE_SUB_CRQ during cleanup

The H_FREE_SUB_CRQ hypercall can return a retry delay return code that
indicates the call needs to be retried after a specific amount of time
delay. The error path to free a sub-CRQ in case of a failure during
channel registration fails to capture the return code of H_FREE_SUB_CRQ
which will result in the delay loop being skipped in the case of a retry
delay return code.

Store the return code result of the H_FREE_SUB_CRQ call such that the
return code check in the delay loop evaluates a meaningful value. Also,
use the rtas_busy_delay() to check the rc value and delay for the
appropriate amount of time.

Fixes: 39e461fddff0 ("ibmvfc: map/request irq and register Sub-CRQ interrupt handler")
Signed-off-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
Reviewed-by: Brian King <brking@...ux.ibm.com>
---
 drivers/scsi/ibmvscsi/ibmvfc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 1d9f961715ca..ef03fa559433 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -21,6 +21,7 @@
 #include <linux/bsg-lib.h>
 #include <asm/firmware.h>
 #include <asm/irq.h>
+#include <asm/rtas.h>
 #include <asm/vio.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -5670,8 +5671,8 @@ 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);
-	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+		rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
+	} while (rtas_busy_delay(rc));
 reg_failed:
 	ibmvfc_free_queue(vhost, scrq);
 	LEAVE;
-- 
2.27.0