tree 1fa229f7d23b09b7b4c4e0262ed8e4e232876c26
parent 2354161dd33b204d36caa0bc48c95cc6c1a984fb
author Cindy H Kao <cindy.h.kao@intel.com> 1272068346 -0700
committer Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> 1273611955 -0700

wimax/i2400m: Reset the TX FIFO indices when allocating the TX FIFO in tx_setup()

This patch makes sure whenever tx_setup() is invoked during driver
initialization or device reset where TX FIFO is released and re-allocated,
the indices tx_in, tx_out, tx_msg_size, tx_sequence, tx_msg are properly
initialized.

When a device reset happens and the TX FIFO is released/re-allocated,
a new block of memory may be allocated for the TX FIFO, therefore tx_msg
should be cleared so that no any TX threads (tx_worker, tx) would access
to the out-of-date addresses.

Also, the TX threads use tx_in and tx_out to decide where to put the new
host-to-device messages and from where to copy them to the device HW FIFO,
these indices have to be cleared so after the TX FIFO is re-allocated during
the reset, the indices both refer to the head of the FIFO, ie. a new start.
The same rational applies to tx_msg_size and tx_sequence.

To protect the indices from being accessed by multiple threads simultaneously,
the lock tx_lock has to be obtained before the initializations and released
afterwards.

Signed-off-by: Cindy H Kao <cindy.h.kao@intel.com>