diff options
Diffstat (limited to 'drivers/usb/core/buffer.c')
| -rw-r--r-- | drivers/usb/core/buffer.c | 57 |
1 files changed, 31 insertions, 26 deletions
diff --git a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c index 28d4972f7ad..684ef70dc09 100644 --- a/drivers/usb/core/buffer.c +++ b/drivers/usb/core/buffer.c @@ -2,7 +2,7 @@ * DMA memory management for framework level HCD code (hc_driver) * * This implementation plugs in through generic "usb_bus" level methods, - * and should work with all USB controllers, regardles of bus type. + * and should work with all USB controllers, regardless of bus type. */ #include <linux/module.h> @@ -10,11 +10,11 @@ #include <linux/slab.h> #include <linux/device.h> #include <linux/mm.h> -#include <asm/io.h> +#include <linux/io.h> #include <linux/dma-mapping.h> #include <linux/dmapool.h> #include <linux/usb.h> -#include "hcd.h" +#include <linux/usb/hcd.h> /* @@ -22,7 +22,7 @@ */ /* FIXME tune these based on pool statistics ... */ -static const size_t pool_max [HCD_BUFFER_POOLS] = { +static const size_t pool_max[HCD_BUFFER_POOLS] = { /* platforms without dma-friendly caches might need to * prevent cacheline sharing... */ @@ -43,26 +43,29 @@ static const size_t pool_max [HCD_BUFFER_POOLS] = { * * Call this as part of initializing a host controller that uses the dma * memory allocators. It initializes some pools of dma-coherent memory that - * will be shared by all drivers using that controller, or returns a negative - * errno value on error. + * will be shared by all drivers using that controller. * * Call hcd_buffer_destroy() to clean up after using those pools. + * + * Return: 0 if successful. A negative errno value otherwise. */ int hcd_buffer_create(struct usb_hcd *hcd) { char name[16]; - int i, size; + int i, size; - if (!hcd->self.controller->dma_mask) + if (!hcd->self.controller->dma_mask && + !(hcd->driver->flags & HCD_LOCAL_MEM)) return 0; - for (i = 0; i < HCD_BUFFER_POOLS; i++) { - if (!(size = pool_max [i])) + for (i = 0; i < HCD_BUFFER_POOLS; i++) { + size = pool_max[i]; + if (!size) continue; snprintf(name, sizeof name, "buffer-%d", size); hcd->pool[i] = dma_pool_create(name, hcd->self.controller, size, size, 0); - if (!hcd->pool [i]) { + if (!hcd->pool[i]) { hcd_buffer_destroy(hcd); return -ENOMEM; } @@ -80,10 +83,10 @@ int hcd_buffer_create(struct usb_hcd *hcd) */ void hcd_buffer_destroy(struct usb_hcd *hcd) { - int i; + int i; - for (i = 0; i < HCD_BUFFER_POOLS; i++) { - struct dma_pool *pool = hcd->pool[i]; + for (i = 0; i < HCD_BUFFER_POOLS; i++) { + struct dma_pool *pool = hcd->pool[i]; if (pool) { dma_pool_destroy(pool); hcd->pool[i] = NULL; @@ -97,49 +100,51 @@ void hcd_buffer_destroy(struct usb_hcd *hcd) */ void *hcd_buffer_alloc( - struct usb_bus *bus, + struct usb_bus *bus, size_t size, gfp_t mem_flags, dma_addr_t *dma ) { struct usb_hcd *hcd = bus_to_hcd(bus); - int i; + int i; /* some USB hosts just use PIO */ - if (!bus->controller->dma_mask) { + if (!bus->controller->dma_mask && + !(hcd->driver->flags & HCD_LOCAL_MEM)) { *dma = ~(dma_addr_t) 0; return kmalloc(size, mem_flags); } for (i = 0; i < HCD_BUFFER_POOLS; i++) { - if (size <= pool_max [i]) - return dma_pool_alloc(hcd->pool [i], mem_flags, dma); + if (size <= pool_max[i]) + return dma_pool_alloc(hcd->pool[i], mem_flags, dma); } - return dma_alloc_coherent(hcd->self.controller, size, dma, 0); + return dma_alloc_coherent(hcd->self.controller, size, dma, mem_flags); } void hcd_buffer_free( - struct usb_bus *bus, + struct usb_bus *bus, size_t size, - void *addr, + void *addr, dma_addr_t dma ) { struct usb_hcd *hcd = bus_to_hcd(bus); - int i; + int i; if (!addr) return; - if (!bus->controller->dma_mask) { + if (!bus->controller->dma_mask && + !(hcd->driver->flags & HCD_LOCAL_MEM)) { kfree(addr); return; } for (i = 0; i < HCD_BUFFER_POOLS; i++) { - if (size <= pool_max [i]) { - dma_pool_free(hcd->pool [i], addr, dma); + if (size <= pool_max[i]) { + dma_pool_free(hcd->pool[i], addr, dma); return; } } |