USB Monitor: BKL pushdown

Add explicit lock_kernel() calls to mon_bin_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c
index 4914553..293a462 100644 (file)
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -15,6 +15,7 @@
 #include <linux/poll.h>
 #include <linux/compat.h>
 #include <linux/mm.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -527,14 +528,17 @@ static int mon_bin_open(struct inode *inode, struct file *file)
        size_t size;
        int rc;
 
+       lock_kernel();
        mutex_lock(&mon_lock);
        if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) {
                mutex_unlock(&mon_lock);
+               unlock_kernel();
                return -ENODEV;
        }
        if (mbus != &mon_bus0 && mbus->u_bus == NULL) {
                printk(KERN_ERR TAG ": consistency error on open\n");
                mutex_unlock(&mon_lock);
+               unlock_kernel();
                return -ENODEV;
        }
 
@@ -568,6 +572,7 @@ static int mon_bin_open(struct inode *inode, struct file *file)
 
        file->private_data = rp;
        mutex_unlock(&mon_lock);
+       unlock_kernel();
        return 0;
 
 err_allocbuff:
@@ -576,6 +581,7 @@ err_allocvec:
        kfree(rp);
 err_alloc:
        mutex_unlock(&mon_lock);
+       unlock_kernel();
        return rc;
 }