wl12xx: Switch to a threaded interrupt handler
authorIdo Yariv <ido@wizery.com>
Tue, 1 Mar 2011 13:14:41 +0000 (15:14 +0200)
committerLuciano Coelho <coelho@ti.com>
Thu, 3 Mar 2011 14:10:46 +0000 (16:10 +0200)
commita620865edf62ea2d024bbfe62162244473badfcb
tree5eb75c0c194cba0e40fa9dc9b6bd01cadff83bf9
parent393fb560d328cc06e6a5c7b7473901ad724f82e7
wl12xx: Switch to a threaded interrupt handler

To achieve maximal throughput, it is very important to react to
interrupts as soon as possible. Currently the interrupt handler wakes up
a worker for handling interrupts in process context. A cleaner and more
efficient design would be to request a threaded interrupt handler.  This
handler's priority is very high, and can do blocking operations such as
SDIO/SPI transactions.

Some work can be deferred, mostly calls to mac80211 APIs
(ieee80211_rx_ni and ieee80211_tx_status). By deferring such work to a
different worker, we can keep the irq handler thread more I/O
responsive. In addition, on multi-core systems the two threads can be
scheduled on different cores, which will improve overall performance.

The use of WL1271_FLAG_IRQ_PENDING & WL1271_FLAG_IRQ_RUNNING was
changed. For simplicity, always query the FW for more pending
interrupts. Since there are relatively long bursts of interrupts, the
extra FW status read overhead is negligible. In addition, this enables
registering the IRQ handler with the ONESHOT option.

Signed-off-by: Ido Yariv <ido@wizery.com>
Reviewed-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
drivers/net/wireless/wl12xx/debugfs.c
drivers/net/wireless/wl12xx/io.h
drivers/net/wireless/wl12xx/main.c
drivers/net/wireless/wl12xx/ps.c
drivers/net/wireless/wl12xx/ps.h
drivers/net/wireless/wl12xx/rx.c
drivers/net/wireless/wl12xx/sdio.c
drivers/net/wireless/wl12xx/spi.c
drivers/net/wireless/wl12xx/tx.c
drivers/net/wireless/wl12xx/wl12xx.h