diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2015-11-12 15:14:23 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-24 10:07:42 +0200 |
| commit | 59e62eb42a5923a095c7616ef9997327e0bfdb70 (patch) | |
| tree | 9b0222872dddbbe98735b7332e007fb96d44c344 | |
| parent | 0da2f8261e3aab234f59541a6a9e1d71d102cd43 (diff) | |
mmc: dw_mmc: use resource_size_t to store physical address
commit 260b31643691e8a58683a4ccc3bdf7abfd86f54a upstream.
The dw_mmc driver stores the physical address of the MMIO registers
in a pointer, which requires the use of type casts, and is actually
broken if anyone ever has this device on a 32-bit SoC in registers
above 4GB. Gcc warns about this possibility when the driver is built
with ARM LPAE enabled:
mmc/host/dw_mmc.c: In function 'dw_mci_edmac_start_dma':
mmc/host/dw_mmc.c:702:17: warning: cast from pointer to integer of different size
cfg.dst_addr = (dma_addr_t)(host->phy_regs + fifo_offset);
^
mmc/host/dw_mmc-pltfm.c: In function 'dw_mci_pltfm_register':
mmc/host/dw_mmc-pltfm.c:63:19: warning: cast to pointer from integer of different size
host->phy_regs = (void *)(regs->start);
This changes the code to use resource_size_t, which gets rid of the
warning, the bug and the useless casts.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/mmc/host/dw_mmc-pltfm.c | 2 | ||||
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 2 | ||||
| -rw-r--r-- | include/linux/mmc/dw_mmc.h | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c index 7e1d13b68b06..81bdeeb05a4d 100644 --- a/drivers/mmc/host/dw_mmc-pltfm.c +++ b/drivers/mmc/host/dw_mmc-pltfm.c @@ -60,7 +60,7 @@ int dw_mci_pltfm_register(struct platform_device *pdev, regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); /* Get registers' physical base address */ - host->phy_regs = (void *)(regs->start); + host->phy_regs = regs->start; host->regs = devm_ioremap_resource(&pdev->dev, regs); if (IS_ERR(host->regs)) return PTR_ERR(host->regs); diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 7a6cedbe48a8..fb204ee6ff89 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -699,7 +699,7 @@ static int dw_mci_edmac_start_dma(struct dw_mci *host, int ret = 0; /* Set external dma config: burst size, burst width */ - cfg.dst_addr = (dma_addr_t)(host->phy_regs + fifo_offset); + cfg.dst_addr = host->phy_regs + fifo_offset; cfg.src_addr = cfg.dst_addr; cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h index f67b2ec18e6d..7776afb0ffa5 100644 --- a/include/linux/mmc/dw_mmc.h +++ b/include/linux/mmc/dw_mmc.h @@ -172,7 +172,7 @@ struct dw_mci { /* For edmac */ struct dw_mci_dma_slave *dms; /* Registers's physical base address */ - void *phy_regs; + resource_size_t phy_regs; u32 cmd_status; u32 data_status; |