From 59e62eb42a5923a095c7616ef9997327e0bfdb70 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Thu, 12 Nov 2015 15:14:23 +0100 Subject: 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 Signed-off-by: Jaehoon Chung Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/host/dw_mmc-pltfm.c | 2 +- drivers/mmc/host/dw_mmc.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers') 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; -- cgit v1.2.3