This is a note to let you know that I've just added the patch titled
usb: dwc2: Fix DMA cache alignment issues
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 4a4863bf2e7932e584a3a462d3c6daf891142ddc Mon Sep 17 00:00:00 2001
From: Martin Schiller ms@dev.tdt.de Date: Mon, 18 Feb 2019 07:37:30 +0100 Subject: usb: dwc2: Fix DMA cache alignment issues
Insert a padding between data and the stored_xfer_buffer pointer to ensure they are not on the same cache line.
Otherwise, the stored_xfer_buffer gets corrupted for IN URBs on non-cache-coherent systems. (In my case: Lantiq xRX200 MIPS)
Fixes: 3bc04e28a030 ("usb: dwc2: host: Get aligned DMA in a more supported way") Fixes: 56406e017a88 ("usb: dwc2: Fix DMA alignment to start at allocated boundary") Cc: stable@vger.kernel.org Tested-by: Douglas Anderson dianders@chromium.org Reviewed-by: Douglas Anderson dianders@chromium.org Acked-by: Minas Harutyunyan hminas@synopsys.com Signed-off-by: Martin Schiller ms@dev.tdt.de Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com --- drivers/usb/dwc2/hcd.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 5c51bf5506d1..2192a2873c7c 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -2480,8 +2480,10 @@ static void dwc2_free_dma_aligned_buffer(struct urb *urb) return;
/* Restore urb->transfer_buffer from the end of the allocated area */ - memcpy(&stored_xfer_buffer, urb->transfer_buffer + - urb->transfer_buffer_length, sizeof(urb->transfer_buffer)); + memcpy(&stored_xfer_buffer, + PTR_ALIGN(urb->transfer_buffer + urb->transfer_buffer_length, + dma_get_cache_alignment()), + sizeof(urb->transfer_buffer));
if (usb_urb_dir_in(urb)) { if (usb_pipeisoc(urb->pipe)) @@ -2513,6 +2515,7 @@ static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) * DMA */ kmalloc_size = urb->transfer_buffer_length + + (dma_get_cache_alignment() - 1) + sizeof(urb->transfer_buffer);
kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); @@ -2523,7 +2526,8 @@ static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) * Position value of original urb->transfer_buffer pointer to the end * of allocation for later referencing */ - memcpy(kmalloc_ptr + urb->transfer_buffer_length, + memcpy(PTR_ALIGN(kmalloc_ptr + urb->transfer_buffer_length, + dma_get_cache_alignment()), &urb->transfer_buffer, sizeof(urb->transfer_buffer));
if (usb_urb_dir_out(urb))