The ioctl handler is called with the BKL held. Registering
unlocked_ioctl handler instead of registering ioctl handler.
Signed-off-by: Nikanth Karthikesan <knikanth@xxxxxxx>
---
diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c
b/arch/x86/kernel/cpu/mcheck/mce_64.c
diff --git a/drivers/block/paride/pt.c b/drivers/block/paride/pt.c
index b91accf..d4fa468 100644
--- a/drivers/block/paride/pt.c
+++ b/drivers/block/paride/pt.c
@@ -236,7 +236,7 @@ static const struct file_operations pt_fops = {
.owner = THIS_MODULE,
.read = pt_read,
.write = pt_write,
- .ioctl = pt_ioctl,
+ .unlocked_ioctl = pt_ioctl,
.open = pt_open,
.release = pt_release,
};
@@ -685,36 +685,43 @@ out:
return err;
}
-static int pt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long
arg)
{
struct pt_unit *tape = file->private_data;
struct mtop __user *p = (void __user *)arg;
struct mtop mtop;
+ lock_kernel();
+
switch (cmd) {
case MTIOCTOP:
- if (copy_from_user(&mtop, p, sizeof(struct mtop)))
+ if (copy_from_user(&mtop, p, sizeof(struct mtop))) {
+ unlock_kernel();
return -EFAULT;
+ }
switch (mtop.mt_op) {
case MTREW:
pt_rewind(tape);
+ unlock_kernel();
return 0;
case MTWEOF:
pt_write_fm(tape);
+ unlock_kernel();
return 0;
default:
printk("%s: Unimplemented mt_op %d\n", tape->name,
mtop.mt_op);
+ unlock_kernel();
return -EINVAL;
}
default:
printk("%s: Unimplemented ioctl 0x%x\n", tape->name, cmd);
+ unlock_kernel();
return -EINVAL;
}
-
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