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authorJonathan Corbet <corbet@lwn.net>2008-05-16 14:06:45 -0600
committerJonathan Corbet <corbet@lwn.net>2008-06-20 14:05:51 -0600
commit5e9829ad38c24aa71252e643836e7cedcb1c83d7 (patch)
tree7eaa004d9e4b4f402e45354a37bc6d8d1a69beea /drivers/sbus/char/bpp.c
parent4541b5ec9f631a143cdea862d07ddfc3cdac36f2 (diff)
bpp: bkl pushdown
Put explicit lock_kernel() calls into bpp_open(). It has locking, but I'm not convinced it won't race with ioctl(). Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/sbus/char/bpp.c')
-rw-r--r--drivers/sbus/char/bpp.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/sbus/char/bpp.c b/drivers/sbus/char/bpp.c
index b87037ec980..c1c091a0057 100644
--- a/drivers/sbus/char/bpp.c
+++ b/drivers/sbus/char/bpp.c
@@ -19,6 +19,7 @@
#include <linux/timer.h>
#include <linux/ioport.h>
#include <linux/major.h>
+#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -429,6 +430,7 @@ static int bpp_open(struct inode *inode, struct file *f)
unsigned minor = iminor(inode);
int ret;
+ lock_kernel();
spin_lock(&bpp_open_lock);
ret = 0;
if (minor >= BPP_NO) {
@@ -444,6 +446,7 @@ static int bpp_open(struct inode *inode, struct file *f)
}
}
spin_unlock(&bpp_open_lock);
+ unlock_kernel();
return ret;
}