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firewire: ohci: replace vm_map_ram() with vmap() 

vm_map_ram() is intended for short-lived objects, so using it for the AR
buffers could fragment address space, especially on a 32-bit machine.
For an allocation that lives as long as the device, vmap() is the better
choice.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Clemens Ladisch 2014-11-16 21:08:49 +01:00 committed by Stefan Richter
parent fc14f9c127
commit 51b04d59c2
1 changed files with 2 additions and 4 deletions
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6
drivers/firewire/ohci.c
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@ -689,8 +689,7 @@ static void ar_context_release(struct ar_context *ctx)
{
unsigned int i;
if (ctx->buffer)
vm_unmap_ram(ctx->buffer, AR_BUFFERS + AR_WRAPAROUND_PAGES);
vunmap(ctx->buffer);
for (i = 0; i < AR_BUFFERS; i++)
if (ctx->pages[i]) {
@ -1018,8 +1017,7 @@ static int ar_context_init(struct ar_context *ctx, struct fw_ohci *ohci,
pages[i] = ctx->pages[i];
for (i = 0; i < AR_WRAPAROUND_PAGES; i++)
pages[AR_BUFFERS + i] = ctx->pages[i];
ctx->buffer = vm_map_ram(pages, AR_BUFFERS + AR_WRAPAROUND_PAGES,
-1, PAGE_KERNEL);
ctx->buffer = vmap(pages, ARRAY_SIZE(pages), VM_MAP, PAGE_KERNEL);
if (!ctx->buffer)
goto out_of_memory;