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

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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to the out-of-date addresses.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>

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This commit is contained in:

Cindy H Kao 2010-04-23 17:19:06 -07:00 • committed by Inaky Perez-Gonzalez

parent 2354161dd3

commit d94401742d

1 changed files with 21 additions and 8 deletions

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drivers/net/wimax/i2400m/tx.c

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