From: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
When USB hosts just use PIO, allocate memory by slab/slub
memory manager, if the required memory size is larger than
one or more page sizes, need allocate memory directly from
buddy systems.
Signed-off-by: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
---
drivers/usb/core/buffer.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c
index fbb087b728dc..28e7db9f93d5 100644
--- a/drivers/usb/core/buffer.c
+++ b/drivers/usb/core/buffer.c
@@ -131,7 +131,8 @@ void *hcd_buffer_alloc(
/* some USB hosts just use PIO */
if (!hcd_uses_dma(hcd)) {
*dma = ~(dma_addr_t) 0;
- return kmalloc(size, mem_flags);
+ return size < PAGE_SIZE ? kmalloc(size, mem_flags)
+ : __get_free_pages(mem_flags, get_order(size));
}
for (i = 0; i < HCD_BUFFER_POOLS; i++) {
@@ -160,8 +161,8 @@ void hcd_buffer_free(
}
if (!hcd_uses_dma(hcd)) {
- kfree(addr);
- return;
+ return size < PAGE_SIZE ? kfree(addr)
+ : free_pages(addr, get_order(size));
}
for (i = 0; i < HCD_BUFFER_POOLS; i++) {
--
2.17.1
