sonypi: BKL pushdown

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/drivers/char/sonypi.c b/drivers/char/sonypi.c
index 58533de..85e0eb7 100644 (file)
--- a/drivers/char/sonypi.c
+++ b/drivers/char/sonypi.c
@@ -49,6 +49,7 @@
 #include <linux/err.h>
 #include <linux/kfifo.h>
 #include <linux/platform_device.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -906,12 +907,14 @@ static int sonypi_misc_release(struct inode *inode, struct file *file)
 
 static int sonypi_misc_open(struct inode *inode, struct file *file)
 {
+       lock_kernel();
        mutex_lock(&sonypi_device.lock);
        /* Flush input queue on first open */
        if (!sonypi_device.open_count)
                kfifo_reset(sonypi_device.fifo);
        sonypi_device.open_count++;
        mutex_unlock(&sonypi_device.lock);
+       unlock_kernel();
        return 0;
 }