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Commit 5eb6bfa0 authored by Ching Huang's avatar Ching Huang Committed by Christoph Hellwig
Browse files

arcmsr: clear outbound doorbell buffer completely 



Clear outbound doorbell buffer completely for adapter type C.  This is to
prevent getting bad data input from IOP before ioctl command processing
starts.

Signed-off-by: default avatarChing Huang <ching2048@areca.com.tw>
Reviewed-by: default avatarTomas Henzl <thenzl@redhat.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent a2c89bbc

drivers/scsi/arcmsr/arcmsr_hba.c

+14 −4
Original line number Diff line number Diff line
@@ -2870,11 +2870,23 @@ static void arcmsr_clear_doorbell_queue_buffer(struct AdapterControlBlock *acb) 
		break;

	case ACB_ADAPTER_TYPE_C: {

		struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;

		uint32_t outbound_doorbell;

		uint32_t outbound_doorbell, i;

		/* empty doorbell Qbuffer if door bell ringed */

		outbound_doorbell = readl(&reg->outbound_doorbell);

		writel(outbound_doorbell, &reg->outbound_doorbell_clear);

		writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, &reg->inbound_doorbell);

		for (i = 0; i < 200; i++) {

			msleep(20);

			outbound_doorbell = readl(&reg->outbound_doorbell);

			if (outbound_doorbell &

				ARCMSR_HBCMU_IOP2DRV_DATA_WRITE_OK) {

				writel(outbound_doorbell,

					&reg->outbound_doorbell_clear);

				writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK,

					&reg->inbound_doorbell);

			} else

				break;

		}

		}

	}

}
@@ -3102,9 +3114,7 @@ sleep: 
				arcmsr_get_firmware_spec(acb);

				arcmsr_start_adapter_bgrb(acb);

				/* clear Qbuffer if door bell ringed */

				outbound_doorbell = readl(&reg->outbound_doorbell);

				writel(outbound_doorbell, &reg->outbound_doorbell_clear); /*clear interrupt */

				writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, &reg->inbound_doorbell);

				arcmsr_clear_doorbell_queue_buffer(acb);

				/* enable outbound Post Queue,outbound doorbell Interrupt */

				arcmsr_enable_outbound_ints(acb, intmask_org);

				atomic_set(&acb->rq_map_token, 16);