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| author | Thomas Gleixner <tglx@linutronix.de> | 2009-10-09 19:02:20 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-10-14 17:04:48 +0200 |
| commit | 05d86412eab6a18cf57697474cc4f8fbfcd6936f (patch) | |
| tree | cc80927fe5be3f3fd5959ebb97a06a96c20392cb /arch/x86/kernel/apm_32.c | |
| parent | ac06ea2cd06291e63951b51dd7c9a23e6a1f2683 (diff) | |
| download | linux-stable-05d86412eab6a18cf57697474cc4f8fbfcd6936f.tar.gz linux-stable-05d86412eab6a18cf57697474cc4f8fbfcd6936f.tar.bz2 linux-stable-05d86412eab6a18cf57697474cc4f8fbfcd6936f.zip | |
x86: Remove BKL from apm_32
The lock/unlock kernel pair in do_open() got there with the BKL push
down and protects nothing. Remove it.
Replace the lock/unlock kernel in the ioctl code with a mutex to
protect standbys_pending and suspends_pending.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <20091010153349.365236337@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/apm_32.c')
| -rw-r--r-- | arch/x86/kernel/apm_32.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c index 151ace69a5aa..b5b6b23bce53 100644 --- a/arch/x86/kernel/apm_32.c +++ b/arch/x86/kernel/apm_32.c @@ -204,7 +204,6 @@ #include <linux/module.h> #include <linux/poll.h> -#include <linux/smp_lock.h> #include <linux/types.h> #include <linux/stddef.h> #include <linux/timer.h> @@ -403,6 +402,7 @@ static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue); static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue); static struct apm_user *user_list; static DEFINE_SPINLOCK(user_list_lock); +static DEFINE_MUTEX(apm_mutex); /* * Set up a segment that references the real mode segment 0x40 @@ -1531,7 +1531,7 @@ static long do_ioctl(struct file *filp, u_int cmd, u_long arg) return -EPERM; switch (cmd) { case APM_IOC_STANDBY: - lock_kernel(); + mutex_lock(&apm_mutex); if (as->standbys_read > 0) { as->standbys_read--; as->standbys_pending--; @@ -1540,10 +1540,10 @@ static long do_ioctl(struct file *filp, u_int cmd, u_long arg) queue_event(APM_USER_STANDBY, as); if (standbys_pending <= 0) standby(); - unlock_kernel(); + mutex_unlock(&apm_mutex); break; case APM_IOC_SUSPEND: - lock_kernel(); + mutex_lock(&apm_mutex); if (as->suspends_read > 0) { as->suspends_read--; as->suspends_pending--; @@ -1552,13 +1552,14 @@ static long do_ioctl(struct file *filp, u_int cmd, u_long arg) queue_event(APM_USER_SUSPEND, as); if (suspends_pending <= 0) { ret = suspend(1); + mutex_unlock(&apm_mutex); } else { as->suspend_wait = 1; + mutex_unlock(&apm_mutex); wait_event_interruptible(apm_suspend_waitqueue, as->suspend_wait == 0); ret = as->suspend_result; } - unlock_kernel(); return ret; default: return -ENOTTY; @@ -1608,12 +1609,10 @@ static int do_open(struct inode *inode, struct file *filp) { struct apm_user *as; - lock_kernel(); as = kmalloc(sizeof(*as), GFP_KERNEL); if (as == NULL) { printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n", sizeof(*as)); - unlock_kernel(); return -ENOMEM; } as->magic = APM_BIOS_MAGIC; @@ -1635,7 +1634,6 @@ static int do_open(struct inode *inode, struct file *filp) user_list = as; spin_unlock(&user_list_lock); filp->private_data = as; - unlock_kernel(); return 0; } |