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List: ipfire-scm
Subject: [git.ipfire.org] IPFire 2.x development tree branch, core126, updated. ed4bbe44d121480e56c817f42f797
From: Arne Fitzenreiter <git () ipfire ! org>
Date: 2018-12-10 19:46:43
Message-ID: 20181210194643.DBF7184FDD5 () people01 ! i ! ipfire ! org
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from ede4314397661889ce05f6a9d4dcdd5cc88ffb40 (commit)
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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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