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

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Message-ID: <1448358798.14472.3.camel@Centos6.3-64>
Date:	Tue, 24 Nov 2015 17:53:18 +0800
From:	Ching Huang <ching2048@...ca.com.tw>
To:	Joe Perches <joe@...ches.com>
Cc:	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,
	hch@....de
Subject: Re: [PATCH 2/2] arcmsr: adds code for support areca new adapter
 ARC1203

On Tue, 2015-11-24 at 01:33 -0800, Joe Perches wrote:
> 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?

That's right. It's need to release the allocated resource for failed condition.
> 
> 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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