usb: wusbcore: change WA_SEGS_MAX to a legal value

change WA_SEGS_MAX to a number that is legal according to the WUSB
spec.

Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/usb/wusbcore/wa-xfer.c b/drivers/usb/wusbcore/wa-xfer.c
index 090ac308c756..ed5abe87b049 100644
--- a/drivers/usb/wusbcore/wa-xfer.c
+++ b/drivers/usb/wusbcore/wa-xfer.c
@@ -91,7 +91,8 @@
 #include "wusbhc.h"
 
 enum {
-        WA_SEGS_MAX = 255,
+        /* [WUSB] section 8.3.3 allocates 7 bits for the segment index. */
+        WA_SEGS_MAX = 128,
 };
 
 enum wa_seg_status {
@@ -588,7 +589,7 @@ static ssize_t __wa_xfer_setup_sizes(struct wa_xfer *xfer,
                         xfer->segs = 1;
         }
 
-        if (xfer->segs >= WA_SEGS_MAX) {
+        if (xfer->segs > WA_SEGS_MAX) {
                 dev_err(dev, "BUG? oops, number of segments %zu bigger than %d\n",
                         (urb->transfer_buffer_length/xfer->seg_size),
                         WA_SEGS_MAX);