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- Log ----------------------------------------------------------------- commit ed4bbe44d121480e56c817f42f797423507c7630 Author: Arne Fitzenreiter arne_f@ipfire.org Date: Mon Dec 10 20:45:54 2018 +0100

kernel: fix dwc2 (usb) dma crashes on RPi1-3

Signed-off-by: Arne Fitzenreiter arne_f@ipfire.org

-----------------------------------------------------------------------

Summary of changes: lfs/linux | 3 + ...ux-4.14-Revert-usb-dwc2-Fix-DMA-alignment.patch | 99 ++++++++++++++++++++++ 2 files changed, 102 insertions(+) create mode 100644 src/patches/linux/linux-4.14-Revert-usb-dwc2-Fix-DMA-alignment.patch

Difference in files: diff --git a/lfs/linux b/lfs/linux index 0994e3e56..346378819 100644 --- a/lfs/linux +++ b/lfs/linux @@ -157,10 +157,13 @@ endif ifeq "$(KCFG)" "-multi" # Apply Arm-multiarch kernel patches. cd $(DIR_APP) && xzcat $(DIR_DL)/arm-multi-patches-$(ARM_PATCHES).patch.xz | patch -Np1 + cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/linux/linux-4.14-Revert-usb-dwc2-Fix-DMA-alignment.patch + endif ifeq "$(BUILD_ARCH)" "aarch64" # Apply Arm-multiarch kernel patches. cd $(DIR_APP) && xzcat $(DIR_DL)/arm-multi-patches-$(ARM_PATCHES).patch.xz | patch -Np1 + cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/linux/linux-4.14-Revert-usb-dwc2-Fix-DMA-alignment.patch endif cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/linux/linux-3.14.79-amba-fix.patch

diff --git a/src/patches/linux/linux-4.14-Revert-usb-dwc2-Fix-DMA-alignment.patch b/src/patches/linux/linux-4.14-Revert-usb-dwc2-Fix-DMA-alignment.patch new file mode 100644 index 000000000..e4c8b9982 --- /dev/null +++ b/src/patches/linux/linux-4.14-Revert-usb-dwc2-Fix-DMA-alignment.patch @@ -0,0 +1,99 @@ +From a44147a09baf8c46cc0b02332df3a4656e0659d5 Mon Sep 17 00:00:00 2001 +From: Arne Fitzenreiter arne_f@ipfire.org +Date: Mon, 10 Dec 2018 13:12:00 +0100 +Subject: [PATCH] Revert "usb: dwc2: Fix DMA alignment to start at allocated + boundary" + +This reverts commit 68fc92a0f3913d539d1ac68a861f895e34099e46. +--- + drivers/usb/dwc2/hcd.c | 44 +++++++++++++++++++++----------------------- + 1 file changed, 21 insertions(+), 23 deletions(-) + +diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c +index fa20ec4..4b81d08 100644 +--- a/drivers/usb/dwc2/hcd.c ++++ b/drivers/usb/dwc2/hcd.c +@@ -2644,29 +2644,34 @@ static int dwc2_alloc_split_dma_aligned_buf(struct dwc2_hsotg *hsotg, + + #define DWC2_USB_DMA_ALIGN 4 + ++struct dma_aligned_buffer { ++ void *kmalloc_ptr; ++ void *old_xfer_buffer; ++ u8 data[0]; ++}; ++ + static void dwc2_free_dma_aligned_buffer(struct urb *urb) + { +- void *stored_xfer_buffer; ++ struct dma_aligned_buffer *temp; + + if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) + 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)); ++ temp = container_of(urb->transfer_buffer, ++ struct dma_aligned_buffer, data); + + if (usb_urb_dir_in(urb)) +- memcpy(stored_xfer_buffer, urb->transfer_buffer, ++ memcpy(temp->old_xfer_buffer, temp->data, + urb->transfer_buffer_length); +- kfree(urb->transfer_buffer); +- urb->transfer_buffer = stored_xfer_buffer; ++ urb->transfer_buffer = temp->old_xfer_buffer; ++ kfree(temp->kmalloc_ptr); + + urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER; + } + + static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) + { +- void *kmalloc_ptr; ++ struct dma_aligned_buffer *temp, *kmalloc_ptr; + size_t kmalloc_size; + + if (urb->num_sgs || urb->sg || +@@ -2674,29 +2679,22 @@ static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) + !((uintptr_t)urb->transfer_buffer & (DWC2_USB_DMA_ALIGN - 1))) + return 0; + +- /* +- * Allocate a buffer with enough padding for original transfer_buffer +- * pointer. This allocation is guaranteed to be aligned properly for +- * DMA +- */ ++ /* Allocate a buffer with enough padding for alignment */ + kmalloc_size = urb->transfer_buffer_length + +- sizeof(urb->transfer_buffer); ++ sizeof(struct dma_aligned_buffer) + DWC2_USB_DMA_ALIGN - 1; + + kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); + if (!kmalloc_ptr) + return -ENOMEM; + +- /* +- * Position value of original urb->transfer_buffer pointer to the end +- * of allocation for later referencing +- */ +- memcpy(kmalloc_ptr + urb->transfer_buffer_length, +- &urb->transfer_buffer, sizeof(urb->transfer_buffer)); +- ++ /* Position our struct dma_aligned_buffer such that data is aligned */ ++ temp = PTR_ALIGN(kmalloc_ptr + 1, DWC2_USB_DMA_ALIGN) - 1; ++ temp->kmalloc_ptr = kmalloc_ptr; ++ temp->old_xfer_buffer = urb->transfer_buffer; + if (usb_urb_dir_out(urb)) +- memcpy(kmalloc_ptr, urb->transfer_buffer, ++ memcpy(temp->data, urb->transfer_buffer, + urb->transfer_buffer_length); +- urb->transfer_buffer = kmalloc_ptr; ++ urb->transfer_buffer = temp->data; + + urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER; + +-- +2.7.4 +

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