Revision 3c77d5137d3f4ff41721e9b4f4812db56a6065c0 authored by Elina Pasheva on 16 October 2009, 19:04:54 UTC, committed by Greg Kroah-Hartman on 30 October 2009, 21:57:33 UTC
This patch presents a fix for the autosuspend feature implementation in sierra usb serial driver for function sierra_send_setup(). Because it is possible to call sierra_send_setup() before sierra_open() or after sierra_close() we added a get/put interface activity to assure that the usb control can happen even when the device is autosuspended. Signed-off-by: Elina Pasheva <epasheva@sierrawireless.com> Tested-by: Matthew Safar <msafar@sierrawireless.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 parent 40ac7b6
dec_and_lock.c
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/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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