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From: Christoph Hellwig <hch@lst.de>
Date: Sun, 11 Aug 2019 10:05:16 +0200
Subject: usb: add a hcd_uses_dma helper
Origin: https://git.kernel.org/linus/edfbcb321faf07ca970e4191abe061deeb7d3788
The USB buffer allocation code is the only place in the usb core (and in
fact the whole kernel) that uses is_device_dma_capable, while the URB
mapping code uses the uses_dma flag in struct usb_bus. Switch the buffer
allocation to use the uses_dma flag used by the rest of the USB code,
and create a helper in hcd.h that checks this flag as well as the
CONFIG_HAS_DMA to simplify the caller a bit.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20190811080520.21712-3-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/core/buffer.c | 10 +++-------
drivers/usb/core/hcd.c | 4 ++--
drivers/usb/dwc2/hcd.c | 2 +-
include/linux/usb.h | 2 +-
include/linux/usb/hcd.h | 3 +++
5 files changed, 10 insertions(+), 11 deletions(-)
--- a/drivers/usb/core/buffer.c
+++ b/drivers/usb/core/buffer.c
@@ -66,9 +66,7 @@
char name[16];
int i, size;
- if (hcd->localmem_pool ||
- !IS_ENABLED(CONFIG_HAS_DMA) ||
- !is_device_dma_capable(hcd->self.sysdev))
+ if (hcd->localmem_pool || !hcd_uses_dma(hcd))
return 0;
for (i = 0; i < HCD_BUFFER_POOLS; i++) {
@@ -133,8 +131,7 @@
return gen_pool_dma_alloc(hcd->localmem_pool, size, dma);
/* some USB hosts just use PIO */
- if (!IS_ENABLED(CONFIG_HAS_DMA) ||
- !is_device_dma_capable(bus->sysdev)) {
+ if (!hcd_uses_dma(hcd)) {
*dma = ~(dma_addr_t) 0;
return kmalloc(size, mem_flags);
}
@@ -164,8 +161,7 @@
return;
}
- if (!IS_ENABLED(CONFIG_HAS_DMA) ||
- !is_device_dma_capable(bus->sysdev)) {
+ if (!hcd_uses_dma(hcd)) {
kfree(addr);
return;
}
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1511,7 +1511,7 @@
if (usb_endpoint_xfer_control(&urb->ep->desc)) {
if (hcd->self.uses_pio_for_control)
return ret;
- if (IS_ENABLED(CONFIG_HAS_DMA) && hcd->self.uses_dma) {
+ if (hcd_uses_dma(hcd)) {
if (is_vmalloc_addr(urb->setup_packet)) {
WARN_ONCE(1, "setup packet is not dma capable\n");
return -EAGAIN;
@@ -1545,7 +1545,7 @@
dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
if (urb->transfer_buffer_length != 0
&& !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
- if (IS_ENABLED(CONFIG_HAS_DMA) && hcd->self.uses_dma) {
+ if (hcd_uses_dma(hcd)) {
if (urb->num_sgs) {
int n;
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4770,7 +4770,7 @@
buf = urb->transfer_buffer;
- if (hcd->self.uses_dma) {
+ if (hcd_uses_dma(hcd)) {
if (!buf && (urb->transfer_dma & 3)) {
dev_err(hsotg->dev,
"%s: unaligned transfer with no transfer_buffer",
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1455,7 +1455,7 @@
* field rather than determining a dma address themselves.
*
* Note that transfer_buffer must still be set if the controller
- * does not support DMA (as indicated by bus.uses_dma) and when talking
+ * does not support DMA (as indicated by hcd_uses_dma()) and when talking
* to root hub. If you have to trasfer between highmem zone and the device
* on such controller, create a bounce buffer or bail out with an error.
* If transfer_buffer cannot be set (is in highmem) and the controller is DMA
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -422,6 +422,9 @@
return hcd->high_prio_bh.completing_ep == ep;
}
+#define hcd_uses_dma(hcd) \
+ (IS_ENABLED(CONFIG_HAS_DMA) && (hcd)->self.uses_dma)
+
extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
int status);
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