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69049cc87d
With Hansjoerg Lipp <hjlipp@web.de> Replace some atomic_t variables in the Gigaset drivers by non-atomic ones, using spinlocks instead to assure atomicity, as proposed in discussions on the linux-kernel mailing list. Signed-off-by: Hansjoerg Lipp <hjlipp@web.de> Signed-off-by: Tilman Schmidt <tilman@imap.cc> Cc: Karsten Keil <kkeil@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* Stuff used by all variants of the driver
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*
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* Copyright (c) 2001 by Stefan Eilers,
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* Hansjoerg Lipp <hjlipp@web.de>,
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* Tilman Schmidt <tilman@imap.cc>.
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*
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* =====================================================================
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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* =====================================================================
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*/
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#include "gigaset.h"
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#include <linux/ctype.h>
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static ssize_t show_cidmode(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int ret;
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unsigned long flags;
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struct cardstate *cs = dev_get_drvdata(dev);
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spin_lock_irqsave(&cs->lock, flags);
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ret = sprintf(buf, "%u\n", cs->cidmode);
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spin_unlock_irqrestore(&cs->lock, flags);
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return ret;
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}
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static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cardstate *cs = dev_get_drvdata(dev);
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long int value;
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char *end;
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value = simple_strtol(buf, &end, 0);
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while (*end)
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if (!isspace(*end++))
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return -EINVAL;
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if (value < 0 || value > 1)
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return -EINVAL;
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if (mutex_lock_interruptible(&cs->mutex))
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return -ERESTARTSYS; // FIXME -EINTR?
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cs->waiting = 1;
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if (!gigaset_add_event(cs, &cs->at_state, EV_PROC_CIDMODE,
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NULL, value, NULL)) {
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cs->waiting = 0;
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mutex_unlock(&cs->mutex);
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return -ENOMEM;
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}
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gig_dbg(DEBUG_CMD, "scheduling PROC_CIDMODE");
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gigaset_schedule_event(cs);
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wait_event(cs->waitqueue, !cs->waiting);
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mutex_unlock(&cs->mutex);
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return count;
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}
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static DEVICE_ATTR(cidmode, S_IRUGO|S_IWUSR, show_cidmode, set_cidmode);
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/* free sysfs for device */
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void gigaset_free_dev_sysfs(struct cardstate *cs)
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{
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gig_dbg(DEBUG_INIT, "removing sysfs entries");
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device_remove_file(cs->dev, &dev_attr_cidmode);
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}
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/* initialize sysfs for device */
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void gigaset_init_dev_sysfs(struct cardstate *cs)
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{
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gig_dbg(DEBUG_INIT, "setting up sysfs");
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device_create_file(cs->dev, &dev_attr_cidmode);
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}
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