wimax/i2400m: USB specific TX queue's minimum buffer room required for new message

This patch specifies the TX queue's buffer room required by the
USB bus driver while allocating header space for a new message.
Please refer the documentation in the code.

Signed-off-by: Prasanna S. Panchamukhi <prasannax.s.panchamukhi@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/wimax/i2400m/usb.c b/drivers/net/wimax/i2400m/usb.c
index d8c4d6497fdf..6fd8cf541d08 100644
--- a/drivers/net/wimax/i2400m/usb.c
+++ b/drivers/net/wimax/i2400m/usb.c
@@ -467,6 +467,13 @@ int i2400mu_probe(struct usb_interface *iface,
         usb_set_intfdata(iface, i2400mu);
 
         i2400m->bus_tx_block_size = I2400MU_BLK_SIZE;
+        /*
+         * Room required in the Tx queue for USB message to accommodate
+         * a smallest payload while allocating header space is 16 bytes.
+         * Adding this room  for the new tx message increases the
+         * possibilities of including any payload with size <= 16 bytes.
+         */
+        i2400m->bus_tx_room_min = I2400MU_BLK_SIZE;
         i2400m->bus_pl_size_max = I2400MU_PL_SIZE_MAX;
         i2400m->bus_setup = NULL;
         i2400m->bus_dev_start = i2400mu_bus_dev_start;