linux-kernel - Re: [PATCH 2/2] arcmsr: adds code for support areca new adapter ARC1203

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Date:	Tue, 24 Nov 2015 01:33:06 -0800
From:	Joe Perches <joe@...ches.com>
To:	Ching Huang <ching2048@...ca.com.tw>, hch@...radead.org,
	thenzl@...hat.com, jbottomley@...allels.com,
	dan.carpenter@...cle.com, agordeev@...hat.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	hch@....de
Subject: Re: [PATCH 2/2] arcmsr: adds code for support areca new adapter
 ARC1203

On Tue, 2015-11-24 at 16:17 +0800, Ching Huang wrote:
> From: Ching Huang <ching2048@...ca.com.tw>
> 
> Support areca new PCIe to SATA RAID adapter ARC1203

Why add the dma_free_coherent to an old data path?
Is that a general bug fix that should be backported?

btw: the printk above the dma_free_coherent use
     shouldn't use a \ line continuation.
     it adds undesired whitespace to the format.

> diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
[]
> @@ -2660,10 +2670,19 @@ static bool arcmsr_hbaB_get_config(struc
>  	iop_firm_version = (char __iomem *)(®->message_rwbuffer[17]);> 	> /*firm_version,17,68-83*/
>  	iop_device_map = (char __iomem *)(®->message_rwbuffer[21]);> 	> /*firm_version,21,84-99*/
>  
> +	arcmsr_wait_firmware_ready(acb);
> +	writel(ARCMSR_MESSAGE_START_DRIVER_MODE, reg->drv2iop_doorbell);
> +	if (!arcmsr_hbaB_wait_msgint_ready(acb)) {
> +		printk(KERN_ERR "arcmsr%d: can't set driver mode.\n", acb->host->host_no);
> +		goto gcfg1;
> +	}
>  	writel(ARCMSR_MESSAGE_GET_CONFIG, reg->drv2iop_doorbell);
>  	if (!arcmsr_hbaB_wait_msgint_ready(acb)) {
>  		printk(KERN_NOTICE "arcmsr%d: wait 'get adapter firmware \
>  			miscellaneous data' timeout \n", acb->host->host_no);
> +gcfg1:
> +		dma_free_coherent(&acb->pdev->dev, acb->roundup_ccbsize,
> +			acb->dma_coherent2, acb->dma_coherent_handle2);
>  		return false;
>  	}
>  	count = 8;

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