Revision 00b4703f03ce04bd7f2f912fd05a243096ab826f authored by Ondrej Zary on 29 July 2010, 20:32:20 UTC, committed by Russell King on 30 July 2010, 22:29:33 UTC
I was testing two CyberPro 2000 based PCI cards on x86 and the machine always hanged completely when the cyber2000fb module was loaded. It seems that the card hangs when some registers are accessed too quickly after writing RAMDAC control register. With this patch, both card work. Add delay after RAMDAC control register write to prevent hangs on module load. Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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grace.c
/*
* Common code for control of lockd and nfsv4 grace periods.
*/
#include <linux/module.h>
#include <linux/lockd/bind.h>
static LIST_HEAD(grace_list);
static DEFINE_SPINLOCK(grace_lock);
/**
* locks_start_grace
* @lm: who this grace period is for
*
* A grace period is a period during which locks should not be given
* out. Currently grace periods are only enforced by the two lock
* managers (lockd and nfsd), using the locks_in_grace() function to
* check when they are in a grace period.
*
* This function is called to start a grace period.
*/
void locks_start_grace(struct lock_manager *lm)
{
spin_lock(&grace_lock);
list_add(&lm->list, &grace_list);
spin_unlock(&grace_lock);
}
EXPORT_SYMBOL_GPL(locks_start_grace);
/**
* locks_end_grace
* @lm: who this grace period is for
*
* Call this function to state that the given lock manager is ready to
* resume regular locking. The grace period will not end until all lock
* managers that called locks_start_grace() also call locks_end_grace().
* Note that callers count on it being safe to call this more than once,
* and the second call should be a no-op.
*/
void locks_end_grace(struct lock_manager *lm)
{
spin_lock(&grace_lock);
list_del_init(&lm->list);
spin_unlock(&grace_lock);
}
EXPORT_SYMBOL_GPL(locks_end_grace);
/**
* locks_in_grace
*
* Lock managers call this function to determine when it is OK for them
* to answer ordinary lock requests, and when they should accept only
* lock reclaims.
*/
int locks_in_grace(void)
{
return !list_empty(&grace_list);
}
EXPORT_SYMBOL_GPL(locks_in_grace);
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