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firewire-ohci: use dma_alloc_pages

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Use dma_alloc_pages to allocate DMAable pages instead of hoping that
the architecture either has GFP_DMA32 or not more than 4G of memory.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2020-09-01 13:48:33 +02:00
parent e8d39a903c
commit c51a9868d3
1 changed files with 11 additions and 15 deletions
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26
drivers/firewire/ohci.c
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@ -674,17 +674,16 @@ static void ar_context_link_page(struct ar_context *ctx, unsigned int index)
static void ar_context_release(struct ar_context *ctx)
{
struct device *dev = ctx->ohci->card.device;
unsigned int i;
vunmap(ctx->buffer);
for (i = 0; i < AR_BUFFERS; i++)
if (ctx->pages[i]) {
dma_unmap_page(ctx->ohci->card.device,
ar_buffer_bus(ctx, i),
PAGE_SIZE, DMA_FROM_DEVICE);
__free_page(ctx->pages[i]);
}
for (i = 0; i < AR_BUFFERS; i++) {
if (ctx->pages[i])
dma_free_pages(dev, PAGE_SIZE, ctx->pages[i],
ar_buffer_bus(ctx, i), DMA_FROM_DEVICE);
}
}
static void ar_context_abort(struct ar_context *ctx, const char *error_msg)
@ -970,6 +969,7 @@ static void ar_context_tasklet(unsigned long data)
static int ar_context_init(struct ar_context *ctx, struct fw_ohci *ohci,
unsigned int descriptors_offset, u32 regs)
{
struct device *dev = ohci->card.device;
unsigned int i;
dma_addr_t dma_addr;
struct page *pages[AR_BUFFERS + AR_WRAPAROUND_PAGES];
@ -980,17 +980,13 @@ static int ar_context_init(struct ar_context *ctx, struct fw_ohci *ohci,
tasklet_init(&ctx->tasklet, ar_context_tasklet, (unsigned long)ctx);
for (i = 0; i < AR_BUFFERS; i++) {
ctx->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32);
ctx->pages[i] = dma_alloc_pages(dev, PAGE_SIZE, &dma_addr,
DMA_FROM_DEVICE, GFP_KERNEL);
if (!ctx->pages[i])
goto out_of_memory;
dma_addr = dma_map_page(ohci->card.device, ctx->pages[i],
0, PAGE_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(ohci->card.device, dma_addr)) {
__free_page(ctx->pages[i]);
ctx->pages[i] = NULL;
goto out_of_memory;
}
set_page_private(ctx->pages[i], dma_addr);
dma_sync_single_for_device(dev, dma_addr, PAGE_SIZE,
DMA_FROM_DEVICE);
}
for (i = 0; i < AR_BUFFERS; i++)