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hwmon: convert idr to ida and use ida_simple interface

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hwmon was using an idr with a NULL pointer, so convert to an
ida which then allows use of Rusty's ida_simple_get.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jonathan Cameron 2011-10-31 17:10:09 -07:00 committed by Linus Torvalds
parent c51eaacce2
commit 4ca5f468cc
1 changed files with 8 additions and 24 deletions
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32
drivers/hwmon/hwmon.c
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@ -27,8 +27,7 @@
static struct class *hwmon_class;
static DEFINE_IDR(hwmon_idr);
static DEFINE_SPINLOCK(idr_lock);
static DEFINE_IDA(hwmon_ida);
/**
* hwmon_device_register - register w/ hwmon
@ -42,30 +41,17 @@ static DEFINE_SPINLOCK(idr_lock);
struct device *hwmon_device_register(struct device *dev)
{
struct device *hwdev;
int id, err;
int id;
again:
if (unlikely(idr_pre_get(&hwmon_idr, GFP_KERNEL) == 0))
return ERR_PTR(-ENOMEM);
id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
if (id < 0)
return ERR_PTR(id);
spin_lock(&idr_lock);
err = idr_get_new(&hwmon_idr, NULL, &id);
spin_unlock(&idr_lock);
if (unlikely(err == -EAGAIN))
goto again;
else if (unlikely(err))
return ERR_PTR(err);
id = id & MAX_ID_MASK;
hwdev = device_create(hwmon_class, dev, MKDEV(0, 0), NULL,
HWMON_ID_FORMAT, id);
if (IS_ERR(hwdev)) {
spin_lock(&idr_lock);
idr_remove(&hwmon_idr, id);
spin_unlock(&idr_lock);
}
if (IS_ERR(hwdev))
ida_simple_remove(&hwmon_ida, id);
return hwdev;
}
@ -81,9 +67,7 @@ void hwmon_device_unregister(struct device *dev)
if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
device_unregister(dev);
spin_lock(&idr_lock);
idr_remove(&hwmon_idr, id);
spin_unlock(&idr_lock);
ida_simple_remove(&hwmon_ida, id);
} else
dev_dbg(dev->parent,
"hwmon_device_unregister() failed: bad class ID!\n");