Re: [v1 3/5] mpt3sas: Separate out RDPQ allocation to new function.

[Christoph Hellwig <hch@infradead.org>]

On Wed, Apr 15, 2020 at 09:25:23AM -0400, Suganath Prabu wrote:
> From: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
> 
> For readability separate out RDPQ allocations to new function
> base_alloc_rdpq_dma_pool().
> 
> Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_base.c | 85 ++++++++++++++++++++++---------------
>  1 file changed, 51 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
> index 7f7b5af..27c829e 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
> @@ -4944,6 +4944,55 @@ mpt3sas_check_same_4gb_region(long reply_pool_start_address, u32 pool_sz)
>  }
>  
>  /**
> + * base_alloc_rdpq_dma_pool - Allocating DMA'able memory
> + *                     for reply queues.
> + * @ioc: per adapter object
> + * @sz: DMA Pool size
> + * Return: 0 for success, non-zero for failure.
> + */
> +static int
> +base_alloc_rdpq_dma_pool(struct MPT3SAS_ADAPTER *ioc, int sz)
> +{
> +	int i;
> +
> +	ioc->reply_post = kcalloc((ioc->rdpq_array_enable) ?
> +	    (ioc->reply_queue_count):1,
> +	    sizeof(struct reply_post_struct), GFP_KERNEL);

Odd use of whitespaces.  Also this would benefit from a little
untangling as well:

	int count = ioc->rdpq_array_enable ? ioc->reply_queue_count : 1;

	ioc->reply_post = kcalloc(count, sizeof(struct reply_post_struct),
			GFP_KERNEL);
> +
> +	if (!ioc->reply_post) {
> +		ioc_err(ioc, "reply_post_free pool: kcalloc failed\n");
> +		return -ENOMEM;
> +	}
> +	ioc->reply_post_free_dma_pool = dma_pool_create("reply_post_free pool",
> +			&ioc->pdev->dev, sz, 16, 0);
> +	if (!ioc->reply_post_free_dma_pool) {
> +		ioc_err(ioc, "reply_post_free pool: dma_pool_create failed\n");
> +		return -ENOMEM;

We normally don't print error messages for memory allocation failures,
as the allocator already prints one including a stack trace.

Same for additional allocations below.

> +	} while (ioc->rdpq_array_enable && (++i < ioc->reply_queue_count));

no need for the inner braces.

> +	total_sz += sz * (!ioc->rdpq_array_enable ? 1 : ioc->reply_queue_count);

	if (ioc->rdpq_array_enable)
		total_sz += sz * ioc->reply_queue_count;
	else
		total_sz += sz;