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authorAlan Stern <stern@rowland.harvard.edu>2010-03-05 23:10:17 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-21 00:21:31 +0400
commit0ede76fcec5415ef82a423a95120286895822e2d (patch)
tree61aa2a0b499a0101033c59b8884328bdb31e5956 /drivers/usb/storage/usb.h
parent749da5f82fe33ff68dd4aa1a5e35cd9aa6246dab (diff)
downloadlinux-0ede76fcec5415ef82a423a95120286895822e2d.tar.xz
USB: remove uses of URB_NO_SETUP_DMA_MAP
This patch (as1350) removes all usages of coherent buffers for USB control-request setup-packet buffers. There's no good reason to reserve coherent memory for these things; control requests are hardly ever used in large quantity (the major exception is firmware transfers, and they aren't time-critical). Furthermore, only seven drivers used it. We might as well always use streaming DMA mappings for setup-packet buffers, and remove some extra complexity from usbcore. The DMA-mapping portion of hcd.c is currently in flux. A separate patch will be submitted to remove support for URB_NO_SETUP_DMA_MAP after everything else settles down. The removal should go smoothly, as by then nobody will be using it. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/storage/usb.h')
-rw-r--r--drivers/usb/storage/usb.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/usb/storage/usb.h b/drivers/usb/storage/usb.h
index 69717134231b..89d3bfff98df 100644
--- a/drivers/usb/storage/usb.h
+++ b/drivers/usb/storage/usb.h
@@ -139,8 +139,7 @@ struct us_data {
struct usb_ctrlrequest *cr; /* control requests */
struct usb_sg_request current_sg; /* scatter-gather req. */
unsigned char *iobuf; /* I/O buffer */
- dma_addr_t cr_dma; /* buffer DMA addresses */
- dma_addr_t iobuf_dma;
+ dma_addr_t iobuf_dma; /* buffer DMA addresses */
struct task_struct *ctl_thread; /* the control thread */
/* mutual exclusion and synchronization structures */