AcoSail/kernel_optimize_test
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tlckl: BKL pushdown

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Put explicit lock_kernel calls into tlclk_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jonathan Corbet 2008-05-16 13:53:00 -06:00
parent f4943db14f
commit b8c71d7ae2
1 changed files with 12 additions and 7 deletions
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19
drivers/char/tlclk.c
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@ -36,6 +36,7 @@
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/timer.h>
#include <linux/sysfs.h>
#include <linux/device.h>
@ -204,11 +205,14 @@ static int tlclk_open(struct inode *inode, struct file *filp)
{
int result;
if (test_and_set_bit(0, &useflags))
return -EBUSY;
lock_kernel();
if (test_and_set_bit(0, &useflags)) {
result = -EBUSY;
/* this legacy device is always one per system and it doesn't
* know how to handle multiple concurrent clients.
*/
goto out;
}
/* Make sure there is no interrupt pending while
* initialising interrupt handler */
@ -218,13 +222,14 @@ static int tlclk_open(struct inode *inode, struct file *filp)
* we can't share this IRQ */
result = request_irq(telclk_interrupt, &tlclk_interrupt,
IRQF_DISABLED, "telco_clock", tlclk_interrupt);
if (result == -EBUSY) {
if (result == -EBUSY)
printk(KERN_ERR "tlclk: Interrupt can't be reserved.\n");
return -EBUSY;
}
inb(TLCLK_REG6); /* Clear interrupt events */
else
inb(TLCLK_REG6); /* Clear interrupt events */
return 0;
out:
unlock_kernel();
return result;
}
static int tlclk_release(struct inode *inode, struct file *filp)