-
由 Jacopo Mondi 提交于
With commit ce883130 ("arch/sh: make the DMA mapping operations observe dev->dma_pfn_offset") the generic DMA allocation function on which the SH 'dma_alloc_coherent()' function relies on, accesses the 'dma_pfn_offset' field of struct device. Unfortunately the 'dma_generic_alloc_coherent()' function is called from several places with a NULL struct device argument, halting the CPU during the boot process. This patch fixes the issue by protecting access to dev->dma_pfn_offset, with a trivial check for validity. It also passes a valid 'struct device' in the 'platform_resource_setup_memory()' function which is the main user of 'dma_alloc_coherent()', and inserts a WARN_ON() check to remind to future (and existing) bogus users of this function to provide a valid 'struct device' whenever possible. Fixes: ce883130 ("arch/sh: make the DMA mapping operations observe dev->dma_pfn_offset") Signed-off-by: NJacopo Mondi <jacopo+renesas@jmondi.org> Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: NThomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: NRich Felker <dalias@libc.org>
b9826a49