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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     ching Huang <ching2048@areca.com.tw>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <sashal@kernel.org>, linux-scsi@vger.kernel.org
Subject: [PATCH AUTOSEL 5.13 028/114] scsi: arcmsr: Fix doorbell status being updated late on ARC-1886
Date:   Fri,  9 Jul 2021 22:16:22 -0400
Message-Id: <20210710021748.3167666-28-sashal@kernel.org>
In-Reply-To: <20210710021748.3167666-1-sashal@kernel.org>
References: <20210710021748.3167666-1-sashal@kernel.org>
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From: ching Huang <ching2048@areca.com.tw>

[ Upstream commit d9a231226f28261a787535e08d0c78669e1ad010 ]

It is possible for the IOP to be delayed in updating the doorbell
status. The doorbell status should not be 0 so loop until the value
changes.

Link: https://lore.kernel.org/r/afdfdf7eabecf14632492c4987a6b9ac6312a7ad.camel@areca.com.tw
Signed-off-by: ching Huang <ching2048@areca.com.tw>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/arcmsr/arcmsr_hba.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index 930972cda38c..42e494a7106c 100644
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -2419,10 +2419,17 @@ static void arcmsr_hbaD_doorbell_isr(struct AdapterControlBlock *pACB)
 
 static void arcmsr_hbaE_doorbell_isr(struct AdapterControlBlock *pACB)
 {
-	uint32_t outbound_doorbell, in_doorbell, tmp;
+	uint32_t outbound_doorbell, in_doorbell, tmp, i;
 	struct MessageUnit_E __iomem *reg = pACB->pmuE;
 
-	in_doorbell = readl(&reg->iobound_doorbell);
+	if (pACB->adapter_type == ACB_ADAPTER_TYPE_F) {
+		for (i = 0; i < 5; i++) {
+			in_doorbell = readl(&reg->iobound_doorbell);
+			if (in_doorbell != 0)
+				break;
+		}
+	} else
+		in_doorbell = readl(&reg->iobound_doorbell);
 	outbound_doorbell = in_doorbell ^ pACB->in_doorbell;
 	do {
 		writel(0, &reg->host_int_status); /* clear interrupt */
-- 
2.30.2