diff options
| author | Jonathan Corbet <corbet@lwn.net> | 2008-05-16 13:53:00 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2008-06-20 14:05:51 -0600 |
| commit | b8c71d7ae2a7f723d171d9175212b6d0a727655d (patch) | |
| tree | 26bc87aac3c7f683dfe7c7aadf8ce112a9e48778 /drivers/char | |
| parent | f4943db14f5071ecbf7ca76722e59a2fd22bda4d (diff) | |
tlckl: BKL pushdown
Put explicit lock_kernel calls into tlclk_open()
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tlclk.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/char/tlclk.c b/drivers/char/tlclk.c index 35e58030d296..8f2284be68e1 100644 --- a/drivers/char/tlclk.c +++ b/drivers/char/tlclk.c @@ -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) |