linux-kernel - Re: [PATCH V9 1/4] dma-mapping: Rework dma_get_cache

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Date:   Fri, 10 Nov 2017 13:30:59 +0100
From:   Christoph Hellwig <hch@....de>
To:     Huacai Chen <chenhc@...ote.com>
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fuxin Zhang <zhangfx@...ote.com>, linux-kernel@...r.kernel.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <james.hogan@...tec.com>,
        linux-mips@...ux-mips.org,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, stable@...r.kernel.org,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Pawel Osciak <pawel@...iak.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Ivan Mikhaylov <ivan@...ibm.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Andy Gross <agross@...eaurora.org>,
        "Mark A . Greer" <mgreer@...malcreek.com>,
        Robert Baldyga <r.baldyga@...kerion.com>
Subject: Re: [PATCH V9 1/4] dma-mapping: Rework dma_get_cache_alignment()

> diff --git a/drivers/net/ethernet/broadcom/b44.c b/drivers/net/ethernet/broadcom/b44.c
> index a1125d1..2f6ffe5 100644
> --- a/drivers/net/ethernet/broadcom/b44.c
> +++ b/drivers/net/ethernet/broadcom/b44.c
> @@ -2344,6 +2344,10 @@ static int b44_init_one(struct ssb_device *sdev,
>  	struct net_device *dev;
>  	struct b44 *bp;
>  	int err;
> +	unsigned int dma_desc_align_size = dma_get_cache_alignment(sdev->dma_dev);
> +
> +	/* Setup paramaters for syncing RX/TX DMA descriptors */
> +	dma_desc_sync_size = max_t(unsigned int, dma_desc_align_size, sizeof(struct dma_desc));
>  
>  	instance++;
>  
> @@ -2587,12 +2591,8 @@ static inline void b44_pci_exit(void)
>  
>  static int __init b44_init(void)
>  {
> -	unsigned int dma_desc_align_size = dma_get_cache_alignment();
>  	int err;
>  
> -	/* Setup paramaters for syncing RX/TX DMA descriptors */
> -	dma_desc_sync_size = max_t(unsigned int, dma_desc_align_size, sizeof(struct dma_desc));
> -

This looks wrong - you override a global variable for each probed
device.