As of now, compat_ioctl already runs without the BKL, whereas ioctl runs
with the BKL. This patch first converts changer_fops to use a .unlocked_ioctl
member. It applies the same locking rationale than ch_ioctl_compat() uses
to ch_ioctl().
Signed-off-by: Mathieu Segaud <mathieu.segaud@xxxxxxxxx>
---
drivers/scsi/ch.c | 19 +++++++++----------
1 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 2311019..b8e005d 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -21,6 +21,7 @@
#include <linux/compat.h>
#include <linux/chio.h> /* here are all the ioctls */
#include <linux/mutex.h>
+#include <linux/smp_lock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@@ -92,8 +93,7 @@ static int ch_probe(struct device *);
static int ch_remove(struct device *);
static int ch_open(struct inode * inode, struct file * filp);
static int ch_release(struct inode * inode, struct file * filp);
-static int ch_ioctl(struct inode * inode, struct file * filp,
- unsigned int cmd, unsigned long arg);
+static long ch_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
#ifdef CONFIG_COMPAT
static long ch_ioctl_compat(struct file * filp,
unsigned int cmd, unsigned long arg);
@@ -130,12 +130,12 @@ static struct scsi_driver ch_template =
static const struct file_operations changer_fops =
{
- .owner = THIS_MODULE,
- .open = ch_open,
- .release = ch_release,
- .ioctl = ch_ioctl,
+ .owner = THIS_MODULE,
+ .open = ch_open,
+ .release = ch_release,
+ .unlocked_ioctl = ch_ioctl,
#ifdef CONFIG_COMPAT
- .compat_ioctl = ch_ioctl_compat,
+ .compat_ioctl = ch_ioctl_compat,
#endif
};
@@ -626,7 +626,7 @@ ch_checkrange(scsi_changer *ch, unsigned int type, unsigned int unit)
return 0;
}
-static int ch_ioctl(struct inode * inode, struct file * file,
+static long ch_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
scsi_changer *ch = file->private_data;
@@ -887,8 +887,7 @@ static long ch_ioctl_compat(struct file * file,
case CHIOINITELEM:
case CHIOSVOLTAG:
/* compatible */
- return ch_ioctl(NULL /* inode, unused */,
- file, cmd, arg);
+ return ch_ioctl(file, cmd, arg);
case CHIOGSTATUS32:
{
struct changer_element_status32 ces32;
--
1.5.3.8
-
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