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| author | Mathias Nyman <[email protected]> | 2021-02-03 11:37:02 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2021-02-03 12:14:45 +0000 |
| commit | d4a610635400ccc382792f6be69427078541c678 (patch) | |
| tree | c7a11e18f8862b084d6cf7e5761f1bc0e0d22ea7 /drivers/usb/cdns3/cdns3-imx.c | |
| parent | usb: host: xhci: mvebu: make USB 3.0 PHY optional for Armada 3720 (diff) | |
| download | kernel-d4a610635400ccc382792f6be69427078541c678.tar.gz kernel-d4a610635400ccc382792f6be69427078541c678.zip | |
xhci: fix bounce buffer usage for non-sg list case
xhci driver may in some special cases need to copy small amounts
of payload data to a bounce buffer in order to meet the boundary
and alignment restrictions set by the xHCI specification.
In the majority of these cases the data is in a sg list, and
driver incorrectly assumed data is always in urb->sg when using
the bounce buffer.
If data instead is contiguous, and in urb->transfer_buffer, we may still
need to bounce buffer a small part if data starts very close (less than
packet size) to a 64k boundary.
Check if sg list is used before copying data to/from it.
Fixes: f9c589e142d0 ("xhci: TD-fragment, align the unsplittable case with a bounce buffer")
Cc: [email protected]
Reported-by: Andreas Hartmann <[email protected]>
Tested-by: Andreas Hartmann <[email protected]>
Signed-off-by: Mathias Nyman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'drivers/usb/cdns3/cdns3-imx.c')
0 files changed, 0 insertions, 0 deletions