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authorJonathan Corbet <corbet@lwn.net>2008-05-18 15:32:43 -0600
committerJonathan Corbet <corbet@lwn.net>2008-06-20 14:05:53 -0600
commitf2b9857eee17797541b845782ade4d7a9d50f843 (patch)
tree914a00afee2ff953199f99f7cf869e3fd83b36bd /drivers/char/vr41xx_giu.c
parent0b2806768899dba5967bcd4a3b93eaed9a1dc4f3 (diff)
downloadblackbird-op-linux-f2b9857eee17797541b845782ade4d7a9d50f843.tar.gz
blackbird-op-linux-f2b9857eee17797541b845782ade4d7a9d50f843.zip
Add a bunch of cycle_kernel_lock() calls
All of the open() functions which don't need the BKL on their face may still depend on its acquisition to serialize opens against driver initialization. So make those functions acquire then release the BKL to be on the safe side. Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/char/vr41xx_giu.c')
-rw-r--r--drivers/char/vr41xx_giu.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/vr41xx_giu.c b/drivers/char/vr41xx_giu.c
index 412937fdb958..ffe9b4e3072e 100644
--- a/drivers/char/vr41xx_giu.c
+++ b/drivers/char/vr41xx_giu.c
@@ -27,6 +27,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/types.h>
@@ -543,12 +544,11 @@ static ssize_t gpio_write(struct file *file, const char __user *data,
return i;
}
-/* No BKL needed here; only global (giu_nr_pins) is only set
- at probe time */
static int gpio_open(struct inode *inode, struct file *file)
{
unsigned int pin;
+ cycle_kernel_lock();
pin = iminor(inode);
if (pin >= giu_nr_pins)
return -EBADF;
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