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intel-agp: fix sglist allocation to avoid vmalloc() 

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-07-29 09:28:45 +01:00
parent 91b8e3056b
commit f692775d7e
2 changed files with 10 additions and 20 deletions
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29
drivers/char/agp/intel-agp.c
View File

@ -198,39 +198,30 @@ static void intel_agp_unmap_page(struct page *page, dma_addr_t dma)
static void intel_agp_free_sglist(struct agp_memory *mem) static void intel_agp_free_sglist(struct agp_memory *mem)
{ {
struct sg_table st;
st.sgl = mem->sg_list;
st.orig_nents = st.nents = mem->page_count;
sg_free_table(&st);
if (mem->sg_vmalloc_flag)
vfree(mem->sg_list);
else
kfree(mem->sg_list);
mem->sg_vmalloc_flag = 0;
mem->sg_list = NULL; mem->sg_list = NULL;
mem->num_sg = 0; mem->num_sg = 0;
} }
static int intel_agp_map_memory(struct agp_memory *mem) static int intel_agp_map_memory(struct agp_memory *mem)
{ {
struct sg_table st;
struct scatterlist *sg; struct scatterlist *sg;
int i; int i;
DBG("try mapping %lu pages\n", (unsigned long)mem->page_count); DBG("try mapping %lu pages\n", (unsigned long)mem->page_count);
if ((mem->page_count * sizeof(*mem->sg_list)) < 2*PAGE_SIZE) if (sg_alloc_table(&st, mem->page_count, GFP_KERNEL))
mem->sg_list = kcalloc(mem->page_count, sizeof(*mem->sg_list),
GFP_KERNEL);
if (mem->sg_list == NULL) {
mem->sg_list = vmalloc(mem->page_count * sizeof(*mem->sg_list));
mem->sg_vmalloc_flag = 1;
}
if (!mem->sg_list) {
mem->sg_vmalloc_flag = 0;
return -ENOMEM; return -ENOMEM;
}
sg_init_table(mem->sg_list, mem->page_count);
sg = mem->sg_list; mem->sg_list = sg = st.sgl;
for (i = 0 ; i < mem->page_count; i++, sg = sg_next(sg)) for (i = 0 ; i < mem->page_count; i++, sg = sg_next(sg))
sg_set_page(sg, mem->pages[i], PAGE_SIZE, 0); sg_set_page(sg, mem->pages[i], PAGE_SIZE, 0);

1
include/linux/agp_backend.h
View File

@ -80,7 +80,6 @@ struct agp_memory {
bool is_bound; bool is_bound;
bool is_flushed; bool is_flushed;
bool vmalloc_flag; bool vmalloc_flag;
bool sg_vmalloc_flag;
/* list of agp_memory mapped to the aperture */ /* list of agp_memory mapped to the aperture */
struct list_head mapped_list; struct list_head mapped_list;
/* DMA-mapped addresses */ /* DMA-mapped addresses */