mirror of
https://github.com/proski/madwifi
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5d546c1ea1
Preprocessor flag now used to toggle printk output prior to blocking on a spinlock. There is of course a chance that the spinlock will be taken between the time we check it and print our little message, but this should still be of some assistance troubleshoot locking mistakes that come up in the future. If you turn on the flag, you can find out what locks are being contended for and from which functions... i.e. ath_intr fights for a particular lock, etc. git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2944 0192ed92-7a03-0410-a25b-9323aeb14dbd
86 lines
3.6 KiB
C
86 lines
3.6 KiB
C
/*-
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* Copyright (c) 2007 Michael Taylor
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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*
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* $Id: foo mtaylor $
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*/
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/*
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* This file provides some macros that are used by if_ath_hal.h,
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* if_ath_hal_wrappers.h, and if_ath_hal_wrappers.c.
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*
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* The macros are provided for the HAL lock and for dynamically deciding whether
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* to define the HAL wrapper functions as inline or in the implementation file
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* at build time. i.e. inline for speed, or non-inline for debugging visibility
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* into the HAL methods being called (despite obfuscation).
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*
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* The if_ath_hal.h file is generated from hal/ah.h at build time by the build
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* system.
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*/
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#ifndef _IF_ATH_HAL_MACROS_H_
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#define _IF_ATH_HAL_MACROS_H_
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#define ATH_HAL_LOCK_INIT(_sc) spin_lock_init(&(_sc)->sc_hal_lock)
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#define ATH_HAL_LOCK_DESTROY(_sc)
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#define ATH_HAL_LOCK_IRQ(_sc) do { \
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unsigned long __sc_halLockflags; \
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ATH_HAL_LOCK_CHECK(_sc); \
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spin_lock_irqsave(&(_sc)->sc_hal_lock, __sc_halLockflags);
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#define ATH_HAL_UNLOCK_IRQ(_sc) \
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ATH_HAL_LOCK_ASSERT(_sc); \
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spin_unlock_irqrestore(&(_sc)->sc_hal_lock, __sc_halLockflags); \
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} while(0)
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#define ATH_HAL_UNLOCK_IRQ_EARLY(_sc) \
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ATH_HAL_LOCK_ASSERT(_sc); \
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spin_unlock_irqrestore(&(_sc)->sc_hal_lock, __sc_halLockflags);
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#if (defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)) && defined(spin_is_locked)
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#define ATH_HAL_LOCK_ASSERT(_sc) \
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KASSERT(spin_is_locked(&(_sc)->sc_hal_lock), ("hal not locked!"))
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#if (defined(ATH_DEBUG_SPINLOCKS))
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#define ATH_HAL_LOCK_CHECK(_sc) do { \
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if (spin_is_locked(&(_sc)->sc_hal_lock)) \
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printk("%s:%d - about to block on hal lock!", __func__, __LINE__); \
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} while(0)
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#else /* #if (defined(ATH_DEBUG_SPINLOCKS)) */
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#define ATH_HAL_LOCK_CHECK(_sc)
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#endif /* #if (defined(ATH_DEBUG_SPINLOCKS)) */
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#else
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#define ATH_HAL_LOCK_ASSERT(_sc)
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#define ATH_HAL_LOCK_CHECK(_sc)
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#endif
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#endif /* #ifndef _IF_ATH_HAL_MACROS_H_ */
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