When the number of HTT packets in the endpoint TxQueue is more
than MaxTxQueueDepth, we hit the overflow condition. If the
overflow condition is hit, in htc_try_send(), when EpSendFull()
returns HTC_SEND_FULL_KEEP, we try to send all the excess packets.
As part of this logic, we are calling restore_tx_packet(); the
intention of calling resotre_tx_packet() is to just perform
skb_pull_head(), but restore_tx_packet() will also unmap the
HTT packet. Later, when we try to send the excess packets, these
would be already unmapped and when the HW/FW try to access this
unmapped location, it would lead to SMMU fault.
Change-Id: Ie60a302d6a2736f7aa12944b7016d2bdb9ffb10d
CRs-Fixed: 2836444
ade01cf0de