From 8981be9b2fe5553af35a43865d9ab4271c3aa2e2 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Sun, 9 Feb 2014 20:59:24 -0500 Subject: [PATCH] Bluetooth: Fix write_room() calculation The skb truesize of a 12-byte payload with a 10-byte head/tail reserve is 768 bytes. Consequently, even with 40 tx_credits, at most 6 packets could be queued at any one time: 40 tx_credits * 127-byte mtu < 768-byte truesize * 7 This error could also cause the tx queue to apparently stall if credit flow control is disabled (where tx_credits is fixed at 5), or if the receiver only granted a limited number of tx credits (eg., less than 7). Instead, track the outstanding number of queued packets not yet sent in wmem_alloc and allow for a maximum of 40 queued packets. Report the space avail for a single write() as the mtu * number of packets left before reaching the maximum. Signed-off-by: Peter Hurley Tested-By: Alexander Holler Signed-off-by: Marcel Holtmann --- Reading git-format-patch failed