staging: mt7621-mmc: Remove unused fields from msdc_dma

The fields used_gpd|bd in struct msdc_dma are only set and reset, but
never used, so remove them. The other removed fields are never used,
so they were removed either.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/mt6575_sd.h

@@ -889,13 +889,6 @@ struct msdc_regs {
 	struct msdc_eco_ver_reg    eco_ver;       /* base+0x104h */
 };
 
-struct scatterlist_ex {
-	u32 cmd;
-	u32 arg;
-	u32 sglen;
-	struct scatterlist *sg;
-};
-
 #define DMA_FLAG_NONE       (0x00000000)
 #define DMA_FLAG_EN_CHKSUM  (0x00000001)
 #define DMA_FLAG_PAD_BLOCK  (0x00000002)
@@ -905,23 +898,13 @@ struct msdc_dma {
 	u32 flags;                   /* flags */
 	u32 xfersz;                  /* xfer size in bytes */
 	u32 sglen;                   /* size of scatter list */
-	u32 blklen;                  /* block size */
 	struct scatterlist *sg;      /* I/O scatter list */
-	struct scatterlist_ex *esg;  /* extended I/O scatter list */
 	u8  mode;                    /* dma mode        */
-	u8  intr;                    /* dma done interrupt */
-	u8  padding;                 /* padding */
-	u32 cmd;                     /* enhanced mode command */
-	u32 arg;                     /* enhanced mode arg */
-	u32 rsp;                     /* enhanced mode command response */
-	u32 autorsp;                 /* auto command response */
 
 	struct gpd *gpd;                  /* pointer to gpd array */
 	struct bd  *bd;                   /* pointer to bd array */
 	dma_addr_t gpd_addr;         /* the physical address of gpd array */
 	dma_addr_t bd_addr;          /* the physical address of bd array */
-	u32 used_gpd;                /* the number of used gpd elements */
-	u32 used_bd;                 /* the number of used bd elements */
 };
 
 struct msdc_host {

drivers/staging/mt7621-mmc/sd.c

@@ -1310,9 +1310,6 @@ static int msdc_dma_config(struct msdc_host *host, struct msdc_dma *dma)
 			bd[j].chksum = (chksum ? msdc_dma_calcs((u8 *)(&bd[j]), 16) : 0);
 		}
 
-		dma->used_gpd += 2;
-		dma->used_bd += dma->sglen;
-
 		sdr_set_field(MSDC_DMA_CFG, MSDC_DMA_CFG_DECSEN, chksum);
 		sdr_set_field(MSDC_DMA_CTRL, MSDC_DMA_CTRL_BRUSTSZ,
 			      MSDC_BRUST_64B);
@@ -1511,8 +1508,6 @@ static int msdc_do_request(struct mmc_host *mmc, struct mmc_request *mrq)
 		host->dma_xfer = 0;
 		if (dma != 0) {
 			msdc_dma_off();
-			host->dma.used_bd  = 0;
-			host->dma.used_gpd = 0;
 			dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len, dir);
 		}
 		host->blksz = 0;
@@ -2618,8 +2613,6 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	host->mrq = NULL;
 	//init_MUTEX(&host->sem); /* we don't need to support multiple threads access */
 
-	host->dma.used_gpd = 0;
-	host->dma.used_bd = 0;
 	mmc_dev(mmc)->dma_mask = NULL;
 
 	/* using dma_alloc_coherent*/  /* todo: using 1, for all 4 slots */