ChangeSet 1.1608.84.28, 2004/03/10 13:31:40-08:00, [EMAIL PROTECTED]
[PATCH] USB: usb buffer allocation shouldn't require DMA
Deepak's recent dma_pool changes accidentally assumed that
all HCDs use DMA. The fix is simple: use kmalloc/kfree
when there's no DMA.
drivers/usb/core/buffer.c | 16 ++++++++++++++--
1 files changed, 14 insertions(+), 2 deletions(-)
diff -Nru a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c
--- a/drivers/usb/core/buffer.c Tue Mar 16 15:02:00 2004
+++ b/drivers/usb/core/buffer.c Tue Mar 16 15:02:00 2004
@@ -51,8 +51,8 @@
* @hcd: the bus whose buffer pools are to be initialized
* Context: !in_interrupt()
*
- * Call this as part of initializing a host controller that uses the pci dma
- * memory allocators. It initializes some pools of dma-consistent memory that
+ * 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.
*
@@ -115,6 +115,12 @@
struct usb_hcd *hcd = bus->hcpriv;
int i;
+ /* some USB hosts just use PIO */
+ if (!bus->controller->dma_mask) {
+ *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);
@@ -134,6 +140,12 @@
if (!addr)
return;
+
+ if (!bus->controller->dma_mask) {
+ kfree (addr);
+ return;
+ }
+
for (i = 0; i < HCD_BUFFER_POOLS; i++) {
if (size <= pool_max [i]) {
dma_pool_free (hcd->pool [i], addr, dma);
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