[PATCH 17/17] firewire-ohci: use dma_alloc_pages

Christoph Hellwig
2020-09-14T15:24:59Z

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>
---
drivers/firewire/ohci.c | 26 +++++++++++---------------
1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 020cb15a4d8fcc..9811c40956e54d 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -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++)
--
2.28.0