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rt2x00: Fix race conditions in flag handling

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Some of the flags should be accessed atomically to
prevent race conditions. The flags that are most important
are those that can change often and indicate the actual
state of the device, queue or queue entry.

The big flag rename was done to move all state flags to
the same naming type as the other rt2x00dev flags and
made sure all places where the flags were used were changed. ;)

Thanks to Stephen for most of the queue flags updates,
which fixes some of the most obvious consequences of the
race conditions. Among those the notorious:

rt2x00queue_write_tx_frame: Error - Arrived at non-free entry in the non-full queue 0.
rt2x00queue_write_tx_frame: Error - Arrived at non-free entry in the non-full queue 0.
rt2x00queue_write_tx_frame: Error - Arrived at non-free entry in the non-full queue 0.

Signed-off-by: Stephen Blackheath <tramp.enshrine.stephen@blacksapphire.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn
2008-08-29 21:04:26 +02:00
committed by John W. Linville
parent de9cc7a4e6
commit 0262ab0df6
11 changed files with 68 additions and 66 deletions
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6
drivers/net/wireless/rt2x00/rt2x00rfkill.c
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@@ -41,16 +41,16 @@ static int rt2x00rfkill_toggle_radio(void *data, enum rfkill_state state)
/*
* Only continue if there are enabled interfaces.
*/
if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
if (!test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
return 0;
if (state == RFKILL_STATE_UNBLOCKED) {
INFO(rt2x00dev, "Hardware button pressed, enabling radio.\n");
__clear_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
clear_bit(DEVICE_STATE_DISABLED_RADIO_HW, &rt2x00dev->flags);
retval = rt2x00lib_enable_radio(rt2x00dev);
} else if (state == RFKILL_STATE_SOFT_BLOCKED) {
INFO(rt2x00dev, "Hardware button pressed, disabling radio.\n");
__set_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
set_bit(DEVICE_STATE_DISABLED_RADIO_HW, &rt2x00dev->flags);
rt2x00lib_disable_radio(rt2x00dev);
} else {
WARNING(rt2x00dev, "Received unexpected rfkill state %d.\n",