parisc-kernel-perf: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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1 changed files with 4 additions and 0 deletions
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@ -46,6 +46,7 @@
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/miscdevice.h>
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#include <linux/smp_lock.h>
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#include <linux/spinlock.h>
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#include <asm/uaccess.h>
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@ -260,13 +261,16 @@ printk("Preparing to start counters\n");
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*/
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static int perf_open(struct inode *inode, struct file *file)
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{
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lock_kernel();
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spin_lock(&perf_lock);
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if (perf_enabled) {
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spin_unlock(&perf_lock);
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unlock_kernel();
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return -EBUSY;
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}
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perf_enabled = 1;
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spin_unlock(&perf_lock);
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unlock_kernel();
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return 0;
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}
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