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authorMathias Nyman <mathias.nyman@linux.intel.com>2021-01-29 15:00:29 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-01-29 14:16:50 +0100
commit0353810a047ef0101af01665f60597d7f5cc6b02 (patch)
tree57dfb5e32ef43466986f38c12ed6598a13c5a0fa /drivers/usb/host/xhci.h
parent55f6153d8cc8eff0852d108f80087fdf41dc2169 (diff)
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xhci: avoid DMA double fetch when reading event trb type.
Instead of re-reading, masking and endianness correcting the same trb several times to get the trb type from an event, just do it once and store it in a local variable. Also pass the trb_type directly to the vendor specific event handler, avoiding one more similar read. In addition to the security benefit this also cleans up the code and helps readability. Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20210129130044.206855-13-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci.h')
-rw-r--r--drivers/usb/host/xhci.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index b28a2d9fe35e..87af91447985 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1419,7 +1419,7 @@ union xhci_trb {
/* MFINDEX Wrap Event - microframe counter wrapped */
#define TRB_MFINDEX_WRAP 39
/* TRB IDs 40-47 reserved, 48-63 is vendor-defined */
-
+#define TRB_VENDOR_DEFINED_LOW 48
/* Nec vendor-specific command completion event. */
#define TRB_NEC_CMD_COMP 48
/* Get NEC firmware revision. */