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mmc: sunxi: avoid invalid pointer calculation 

The sunxi mmc driver tries to calculate a dma address by using pointer
arithmetic, which causes a warning when dma_addr_t is wider than a pointer:

drivers/mmc/host/sunxi-mmc.c: In function 'sunxi_mmc_init_idma_des':
drivers/mmc/host/sunxi-mmc.c:296:35: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  struct sunxi_idma_des *pdes_pa = (struct sunxi_idma_des *)host->sg_dma;
                                   ^

To avoid this warning and to simplify the logic, this changes
the code to avoid the cast and calculate the correct address
manually. The behavior should be unchanged.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David Lanzendörfer <david.lanzendoerfer@o2s.ch>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Arnd Bergmann 2015-02-24 10:47:27 +01:00 committed by Ulf Hansson
parent 5f2e097ce0
commit d34712d2e3
1 changed files with 3 additions and 2 deletions
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5
drivers/mmc/host/sunxi-mmc.c
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@ -293,7 +293,7 @@ static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
struct mmc_data *data)
{
struct sunxi_idma_des *pdes = (struct sunxi_idma_des *)host->sg_cpu;
struct sunxi_idma_des *pdes_pa = (struct sunxi_idma_des *)host->sg_dma;
dma_addr_t next_desc = host->sg_dma;
int i, max_len = (1 << host->idma_des_size_bits);
for (i = 0; i < data->sg_len; i++) {
@ -305,8 +305,9 @@ static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
else
pdes[i].buf_size = data->sg[i].length;
next_desc += sizeof(struct sunxi_idma_des);
pdes[i].buf_addr_ptr1 = sg_dma_address(&data->sg[i]);
pdes[i].buf_addr_ptr2 = (u32)&pdes_pa[i + 1];
pdes[i].buf_addr_ptr2 = (u32)next_desc;
}
pdes[0].config |= SDXC_IDMAC_DES0_FD;