From: Cindy H Kao Date: Sat, 24 Apr 2010 00:19:06 +0000 (-0700) Subject: wimax/i2400m: Reset the TX FIFO indices when allocating the TX FIFO in tx_setup() X-Git-Tag: v2.6.35-rc1~473^2~99^2~16 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d94401742dc662747db5bb9e444d353a4feba018;p=pandora-kernel.git 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for the TX FIFO, therefore tx_msg should be cleared so that no any TX threads (tx_worker, tx) would access to the out-of-date addresses.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 --- Reading git-diff-tree failed