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mISDN: improve bitops usage

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This improves bitops usages in several points:

- Convert u64 to a proper bitmap declaration.  This enables to remove
  superfluous typecasting from 'u64' to 'unsigned long *'.

- Convert superfluous atomic bitops to non atomic bitops.  The bitmap
  is allocated on the stack and it is not accessed by any other threads,
  so using atomic bitops is not necessary.

- Use find_next_zero_bit and find_next_zero_bit instead of calling
  test_bit() for each bit.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Akinobu Mita 2012-11-29 01:27:45 +00:00 committed by David S. Miller
parent 6e22ce2c6e
commit 481af03bfb
1 changed files with 10 additions and 10 deletions
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20
drivers/isdn/mISDN/tei.c
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@ -250,7 +250,7 @@ tei_debug(struct FsmInst *fi, char *fmt, ...)
static int
get_free_id(struct manager *mgr)
{
u64 ids = 0;
DECLARE_BITMAP(ids, 64) = { [0 ... BITS_TO_LONGS(64) - 1] = 0 };
int i;
struct layer2 *l2;
@ -261,11 +261,11 @@ get_free_id(struct manager *mgr)
__func__);
return -EBUSY;
}
test_and_set_bit(l2->ch.nr, (u_long *)&ids);
__set_bit(l2->ch.nr, ids);
}
for (i = 1; i < 64; i++)
if (!test_bit(i, (u_long *)&ids))
return i;
i = find_next_zero_bit(ids, 64, 1);
if (i < 64)
return i;
printk(KERN_WARNING "%s: more as 63 layer2 for one device\n",
__func__);
return -EBUSY;
@ -274,7 +274,7 @@ get_free_id(struct manager *mgr)
static int
get_free_tei(struct manager *mgr)
{
u64 ids = 0;
DECLARE_BITMAP(ids, 64) = { [0 ... BITS_TO_LONGS(64) - 1] = 0 };
int i;
struct layer2 *l2;
@ -288,11 +288,11 @@ get_free_tei(struct manager *mgr)
continue;
i -= 64;
test_and_set_bit(i, (u_long *)&ids);
__set_bit(i, ids);
}
for (i = 0; i < 64; i++)
if (!test_bit(i, (u_long *)&ids))
return i + 64;
i = find_first_zero_bit(ids, 64);
if (i < 64)
return i + 64;
printk(KERN_WARNING "%s: more as 63 dynamic tei for one device\n",
__func__);
return -1;