mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-29 05:44:11 +00:00
swiotlb: check alloc_size before the allocation of a new memory pool
The allocation request for swiotlb contiguous memory greater than 128*2KB cannot be fulfilled because it exceeds the maximum contiguous memory limit. If the swiotlb memory we allocate is larger than 128*2KB, swiotlb_find_slots() will still schedule the allocation of a new memory pool, which will increase memory overhead. Fix it by adding a check with alloc_size no more than 128*2KB before scheduling the allocation of a new memory pool in swiotlb_find_slots(). Signed-off-by: ZhangPeng <zhangpeng362@huawei.com> Reviewed-by: Petr Tesarik <petr.tesarik1@huawei-partners.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
parent
b07bc23476
commit
3dc2f20920
1 changed files with 3 additions and 0 deletions
|
@ -1136,6 +1136,9 @@ static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
|
|||
int cpu, i;
|
||||
int index;
|
||||
|
||||
if (alloc_size > IO_TLB_SEGSIZE * IO_TLB_SIZE)
|
||||
return -1;
|
||||
|
||||
cpu = raw_smp_processor_id();
|
||||
for (i = 0; i < default_nareas; ++i) {
|
||||
index = swiotlb_search_area(dev, cpu, i, orig_addr, alloc_size,
|
||||
|
|
Loading…
Reference in a new issue