Revision 879d68a445dd7073a8c022fcdd21dc27eca7f192 authored by Ryan Press on 26 March 2013, 23:32:31 UTC, committed by Jason Cooper on 28 March 2013, 17:29:23 UTC
The previous configuration used the wrong "clk" pin. Without this change mv_sdio worked because the bootloader would set the pin up, but with a bootloader that does not set the pin, mv_sdio fails to detect any card. I have tested this change using a mwifiex_sdio wireless network adapter over the SDIO interface. Signed-off-by: Ryan Press <ryan@presslab.us> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
1 parent e0656a9
dec_and_lock.c
#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/atomic.h>
/*
* This is an implementation of the notion of "decrement a
* reference count, and return locked if it decremented to zero".
*
* NOTE NOTE NOTE! This is _not_ equivalent to
*
* if (atomic_dec_and_test(&atomic)) {
* spin_lock(&lock);
* return 1;
* }
* return 0;
*
* because the spin-lock and the decrement must be
* "atomic".
*/
int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
{
/* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
if (atomic_add_unless(atomic, -1, 1))
return 0;
/* Otherwise do it the slow way */
spin_lock(lock);
if (atomic_dec_and_test(atomic))
return 1;
spin_unlock(lock);
return 0;
}
EXPORT_SYMBOL(_atomic_dec_and_lock);
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