6.6-stable review patch. If anyone has any objections, please let me know.
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From: Michał Mirosław mirq-linux@rere.qmqm.pl
[ Upstream commit 2ae61a2562c0d1720545b0845829a65fb6a9c2c6 ]
The USB host on Tegra3 works with 32-bit alignment. Previous code tried to align the buffer, but it did align the wrapper struct instead, so the buffer was at a constant offset of 8 bytes (two pointers) from expected alignment. Since kmalloc() guarantees at least 8-byte alignment already, the alignment-extending is removed.
Fixes: fc53d5279094 ("usb: chipidea: tegra: Support host mode") Signed-off-by: Michał Mirosław mirq-linux@rere.qmqm.pl Link: https://lore.kernel.org/r/a0d917d492b1f91ee0019e68b8e8bca9c585393f.169593494... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/chipidea/host.c | 45 +++++++++++++++---------------------- 1 file changed, 18 insertions(+), 27 deletions(-)
diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c index abddd39d1ff1e..0cce192083701 100644 --- a/drivers/usb/chipidea/host.c +++ b/drivers/usb/chipidea/host.c @@ -30,8 +30,7 @@ struct ehci_ci_priv { };
struct ci_hdrc_dma_aligned_buffer { - void *kmalloc_ptr; - void *old_xfer_buffer; + void *original_buffer; u8 data[]; };
@@ -380,60 +379,52 @@ static int ci_ehci_bus_suspend(struct usb_hcd *hcd) return 0; }
-static void ci_hdrc_free_dma_aligned_buffer(struct urb *urb) +static void ci_hdrc_free_dma_aligned_buffer(struct urb *urb, bool copy_back) { struct ci_hdrc_dma_aligned_buffer *temp; - size_t length;
if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) return; + urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
temp = container_of(urb->transfer_buffer, struct ci_hdrc_dma_aligned_buffer, data); + urb->transfer_buffer = temp->original_buffer; + + if (copy_back && usb_urb_dir_in(urb)) { + size_t length;
- if (usb_urb_dir_in(urb)) { if (usb_pipeisoc(urb->pipe)) length = urb->transfer_buffer_length; else length = urb->actual_length;
- memcpy(temp->old_xfer_buffer, temp->data, length); + memcpy(temp->original_buffer, temp->data, length); } - urb->transfer_buffer = temp->old_xfer_buffer; - kfree(temp->kmalloc_ptr);
- urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER; + kfree(temp); }
static int ci_hdrc_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) { - struct ci_hdrc_dma_aligned_buffer *temp, *kmalloc_ptr; - const unsigned int ci_hdrc_usb_dma_align = 32; - size_t kmalloc_size; + struct ci_hdrc_dma_aligned_buffer *temp;
if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0) return 0; - if (!((uintptr_t)urb->transfer_buffer & (ci_hdrc_usb_dma_align - 1)) && !(urb->transfer_buffer_length & 3)) + if (IS_ALIGNED((uintptr_t)urb->transfer_buffer, 4) + && IS_ALIGNED(urb->transfer_buffer_length, 4)) return 0;
- /* Allocate a buffer with enough padding for alignment */ - kmalloc_size = ALIGN(urb->transfer_buffer_length, 4) + - sizeof(struct ci_hdrc_dma_aligned_buffer) + - ci_hdrc_usb_dma_align - 1; - - kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); - if (!kmalloc_ptr) + temp = kmalloc(sizeof(*temp) + ALIGN(urb->transfer_buffer_length, 4), mem_flags); + if (!temp) return -ENOMEM;
- /* Position our struct dma_aligned_buffer such that data is aligned */ - temp = PTR_ALIGN(kmalloc_ptr + 1, ci_hdrc_usb_dma_align) - 1; - temp->kmalloc_ptr = kmalloc_ptr; - temp->old_xfer_buffer = urb->transfer_buffer; if (usb_urb_dir_out(urb)) memcpy(temp->data, urb->transfer_buffer, urb->transfer_buffer_length); - urb->transfer_buffer = temp->data;
+ temp->original_buffer = urb->transfer_buffer; + urb->transfer_buffer = temp->data; urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
return 0; @@ -450,7 +441,7 @@ static int ci_hdrc_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); if (ret) - ci_hdrc_free_dma_aligned_buffer(urb); + ci_hdrc_free_dma_aligned_buffer(urb, false);
return ret; } @@ -458,7 +449,7 @@ static int ci_hdrc_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, static void ci_hdrc_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) { usb_hcd_unmap_urb_for_dma(hcd, urb); - ci_hdrc_free_dma_aligned_buffer(urb); + ci_hdrc_free_dma_aligned_buffer(urb, true); }
#ifdef CONFIG_PM_SLEEP