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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/scsi
parent0b2806768899dba5967bcd4a3b93eaed9a1dc4f3 (diff)
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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/scsi')
-rw-r--r--drivers/scsi/3w-9xxx.c5
-rw-r--r--drivers/scsi/3w-xxxx.c5
-rw-r--r--drivers/scsi/megaraid.c4
-rw-r--r--drivers/scsi/megaraid/megaraid_sas.c3
4 files changed, 10 insertions, 7 deletions
diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index 2239d16..eaa805d 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -84,6 +84,7 @@
#include <linux/pci.h>
#include <linux/time.h>
#include <linux/mutex.h>
+#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
@@ -862,13 +863,13 @@ out:
} /* End twa_chrdev_ioctl() */
/* This function handles open for the character device */
-/* NOTE that this function will race with remove; adding BKL
- will not help. */
+/* NOTE that this function will race with remove. */
static int twa_chrdev_open(struct inode *inode, struct file *file)
{
unsigned int minor_number;
int retval = TW_IOCTL_ERROR_OS_ENODEV;
+ cycle_kernel_lock();
minor_number = iminor(inode);
if (minor_number >= twa_device_extension_count)
goto out;
diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index bbff029..a0537f0 100644
--- a/drivers/scsi/3w-xxxx.c
+++ b/drivers/scsi/3w-xxxx.c
@@ -198,6 +198,7 @@
#include <linux/module.h>
#include <linux/reboot.h>
+#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/moduleparam.h>
@@ -1027,12 +1028,12 @@ out:
} /* End tw_chrdev_ioctl() */
/* This function handles open for the character device */
-/* NOTE that this function races with remove - adding BKL
- won't help */
+/* NOTE that this function races with remove. */
static int tw_chrdev_open(struct inode *inode, struct file *file)
{
unsigned int minor_number;
+ cycle_kernel_lock();
dprintk(KERN_WARNING "3w-xxxx: tw_ioctl_open()\n");
minor_number = iminor(inode);
diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index c9aa2c4..28c9da7 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -46,6 +46,7 @@
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
+#include <linux/smp_lock.h>
#include <scsi/scsicam.h>
#include "scsi.h"
@@ -3273,12 +3274,11 @@ mega_init_scb(adapter_t *adapter)
*
* Routines for the character/ioctl interface to the driver. Find out if this
* is a valid open.
- *
- * No BKL needed here.
*/
static int
megadev_open (struct inode *inode, struct file *filep)
{
+ cycle_kernel_lock();
/*
* Only allow superuser to access private ioctl interface
*/
diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 81374b7..fc7ac15 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -33,6 +33,7 @@
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
+#include <linux/smp_lock.h>
#include <linux/uio.h>
#include <asm/uaccess.h>
#include <linux/fs.h>
@@ -2860,10 +2861,10 @@ static void megasas_shutdown(struct pci_dev *pdev)
/**
* megasas_mgmt_open - char node "open" entry point
- * No BKL is needed here.
*/
static int megasas_mgmt_open(struct inode *inode, struct file *filep)
{
+ cycle_kernel_lock();
/*
* Allow only those users with admin rights
*/