linux-kernel - Re: [PATCH 1/3] arcmsr: Support Areca new SATA Raid Adapter ARC1214/1224/1264/1284

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Message-ID: <521B482A.80908@redhat.com>
Date:	Mon, 26 Aug 2013 14:20:58 +0200
From:	Tomas Henzl <thenzl@...hat.com>
To:	黃清隆 <ching2048@...ca.com.tw>
CC:	james.bottomley@...senpartnership.com,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, billion@...ca.com.tw
Subject: Re: [PATCH 1/3] arcmsr: Support Areca new SATA Raid Adapter ARC1214/1224/1264/1284

On 08/26/2013 06:14 AM, 黃清隆 wrote:
>  From: Ching <ching2048@...ca.com.tw>
>
> Support Areca new SATA Raid adapter ARC1214/1224/1264/1284.
> Modify maximum outstanding command number, notify command complete with auto
> request sense
> Signed-off-by: Ching  <ching2048@...ca.com.tw>

Hi Ching,
+static bool
+arcmsr_hbaD_get_config(struct AdapterControlBlock *acb)
+{
...
+	dma_coherent = dma_alloc_coherent(&pdev->dev, acb->uncache_size,
+	&dma_coherent_handle, GFP_KERNEL);
+	if (!dma_coherent) {
+		pr_notice("DMA allocation failed...\n");
+		return -ENOMEM;
You've declared the return value as a bool so the function should return false or true.
---------------------------------------
In arcmsr_alloc_ccb_pool
-	roundup_ccbsize = roundup(sizeof(struct CommandControlBlock) + (max_sg_entrys - 1) * sizeof(struct SG64ENTRY), 32);
-	acb->uncache_size = roundup_ccbsize * ARCMSR_MAX_FREECCB_NUM;
-	dma_coherent = dma_alloc_coherent(&pdev->dev, acb->uncache_size, &dma_coherent_handle, GFP_KERNEL);
-	if(!dma_coherent){
-		printk(KERN_NOTICE "arcmsr%d: dma_alloc_coherent got error\n", acb->host->host_no);
-		return -ENOMEM;
+	switch (acb->adapter_type) {
+	case ACB_ADAPTER_TYPE_A: {
+		roundup_ccbsize =
+		roundup(sizeof(struct CommandControlBlock) +
+		max_sg_entrys * sizeof(struct SG64ENTRY), 32);
+		acb->uncache_size = roundup_ccbsize *
+			ARCMSR_MAX_FREECCB_NUM;
+		dma_coherent = dma_alloc_coherent(&pdev->dev,
+			acb->uncache_size, &dma_coherent_handle,
+			GFP_KERNEL);
...
+	case ACB_ADAPTER_TYPE_B: {
+		roundup_ccbsize = roundup(sizeof(struct CommandControlBlock) +
+			(max_sg_entrys - 1) * sizeof(struct SG64ENTRY), 32);
+		acb->uncache_size = roundup_ccbsize *
+			ARCMSR_MAX_FREECCB_NUM;
+		dma_coherent = dma_alloc_coherent(&pdev->dev,
+			acb->uncache_size, &dma_coherent_handle,
+			GFP_KERNEL);
You've added a switch with  four almost identical
cases, what is the point of splitting the code this way?
-----------------------------------------
 struct AdapterControlBlock
+	void *dma_coherent;
+	dma_addr_t dma_coherent_handle;
+	dma_addr_t dma_coherent_handle2;
+	void *dma_coherent2;
why do you need these pairs? Is there an adapter which uses both
for example dma_coherent and dma_coherent2 at the same time?

Please include the patch into the message body next time, it makes the review easier.
Thanks, Tomas 
 

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