diff options
| author | Magnus Damm <magnus.damm@gmail.com> | 2008-01-23 15:58:35 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-01 14:35:05 -0800 |
| commit | b3476675320eda83cf061a686cdc80b76f2bfdc4 (patch) | |
| tree | 11d31a0ade5c961fd5738a67b99ccb411325607d /drivers/usb/core/buffer.c | |
| parent | 0915f490d81c1a5098b399ec6c0be45bd421ee1d (diff) | |
| download | linux-b3476675320eda83cf061a686cdc80b76f2bfdc4.tar.bz2 | |
usb: dma bounce buffer support
usb: dma bounce buffer support V4
This patch adds dma bounce buffer support to the usb core. These buffers
can be enabled with the HCD_LOCAL_MEM flag, and they make sure that all data
passed to the host controller is allocated using dma_alloc_coherent().
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/buffer.c')
| -rw-r--r-- | drivers/usb/core/buffer.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c index 28d4972f7ad5..acd9f00a0b76 100644 --- a/drivers/usb/core/buffer.c +++ b/drivers/usb/core/buffer.c @@ -53,7 +53,8 @@ int hcd_buffer_create(struct usb_hcd *hcd) char name[16]; 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++) { @@ -107,7 +108,8 @@ void *hcd_buffer_alloc( 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); } @@ -132,7 +134,8 @@ void hcd_buffer_free( if (!addr) return; - if (!bus->controller->dma_mask) { + if (!bus->controller->dma_mask && + !(hcd->driver->flags & HCD_LOCAL_MEM)) { kfree(addr); return; } |