commit edfbcb321faf07ca970e4191abe061deeb7d3788 upstream. 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@xxxxxx> Link: https://lore.kernel.org/r/20190811080520.21712-3-hch@xxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: John L. Villalovos <jlvillal@xxxxxxxxxxxxxxxxxxxxxx> --- 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(-) diff --git a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c index 8f1697bcc170..84055ed842ff 100644 --- a/drivers/usb/core/buffer.c +++ b/drivers/usb/core/buffer.c @@ -66,9 +66,7 @@ int hcd_buffer_create(struct usb_hcd *hcd) 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 @@ void *hcd_buffer_alloc( 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 @@ void hcd_buffer_free( return; } - if (!IS_ENABLED(CONFIG_HAS_DMA) || - !is_device_dma_capable(bus->sysdev)) { + if (!hcd_uses_dma(hcd)) { kfree(addr); return; } diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index c991e7ff1875..8b8ec0c7325d 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -1511,7 +1511,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, 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 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, 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; diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index a5c8329fd462..797bb4f2a52c 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -4770,7 +4770,7 @@ static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, 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", diff --git a/include/linux/usb.h b/include/linux/usb.h index ff010d1fd1c7..667712d416c1 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -1455,7 +1455,7 @@ typedef void (*usb_complete_t)(struct urb *); * 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 diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h index e24dade77132..aa69d7d5762a 100644 --- a/include/linux/usb/hcd.h +++ b/include/linux/usb/hcd.h @@ -422,6 +422,9 @@ static inline bool hcd_periodic_completion_in_progress(struct usb_hcd *hcd, 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); -- 2.26.2
