[PATCH 2/2] USB: ehci-tegra: fix inefficient copy of unaligned buffers

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Make sure only to copy any actual data rather than the whole buffer,
when releasing the temporary buffer used for unaligned transfer buffers.

Note that the corresponding fix of musb also fixes a lockup on
disconnect, where repeated failed transfers would starve the hub
workqueue from processing the disconnect, which would have prevented the
urbs from being resubmitted. In this case there is no data to forward,
but the full buffer length was being copied nonetheless.

Compile-tested only.

Fixes: fbf9865c6d96 ("USB: ehci: tegra: Align DMA transfers to 32 bytes")
Cc: stable <stable@xxxxxxxxxxxxxxx>	# v2.6.39
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
 drivers/usb/host/ehci-tegra.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index ff9af29b4e9f..dfe2a7abc36d 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -313,7 +313,7 @@ static void free_dma_aligned_buffer(struct urb *urb)
 
 	if (usb_urb_dir_in(urb))
 		memcpy(temp->old_xfer_buffer, temp->data,
-		       urb->transfer_buffer_length);
+		       urb->actual_length);
 	urb->transfer_buffer = temp->old_xfer_buffer;
 	kfree(temp->kmalloc_ptr);
 
-- 
2.0.5

--
To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [ARM Kernel]     [Linux ARM]     [Linux ARM MSM]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux