Revert "pktcdvd: push BKL down into driver"

This reverts commit 5b6155ee70e9c4d2ad7e6f514c8eee06e2711c3a, because
the block device ioctl's really aren't ready for it.

In particular, the "struct file *" and the "struct inode *" arguments do
not necessarily match, which means that the unlocked version of the
ioctl (that only gets a "struct file *") isn't actually able to handle
the cases it needs to handle.

This fixes bugzilla

	http://bugzilla.kernel.org/show_bug.cgi?id=11401

Reported-and-bisected-by: Laurent Riffard <laurent.riffard@free.fr>
Acked-by: Peter Osterlund <petero2@telia.com>
Cc: Alan Cox <alan@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 25 deletions

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 158eed4d5161..29b7a648cc6e 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -49,7 +49,6 @@
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/kthread.h>
-#include <linux/smp_lock.h>
 #include <linux/errno.h>
 #include <linux/spinlock.h>
 #include <linux/file.h>
@@ -2798,14 +2797,9 @@ out_mem:
         return ret;
 }
 
-static long pkt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 {
-        struct inode *inode = file->f_path.dentry->d_inode;
-        struct pktcdvd_device *pd;
-        long ret;
-
-        lock_kernel();
-        pd = inode->i_bdev->bd_disk->private_data;
+        struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
 
         VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
 
@@ -2818,8 +2812,7 @@ static long pkt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
         case CDROM_LAST_WRITTEN:
         case CDROM_SEND_PACKET:
         case SCSI_IOCTL_SEND_COMMAND:
-                ret = blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
-                break;
+                return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
 
         case CDROMEJECT:
                 /*
@@ -2828,15 +2821,14 @@ static long pkt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                  */
                 if (pd->refcnt == 1)
                         pkt_lock_door(pd, 0);
-                ret = blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
-                break;
+                return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
 
         default:
                 VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
-                ret = -ENOTTY;
+                return -ENOTTY;
         }
-        unlock_kernel();
-        return ret;
+
+        return 0;
 }
 
 static int pkt_media_changed(struct gendisk *disk)
@@ -2858,7 +2850,7 @@ static struct block_device_operations pktcdvd_ops = {
         .owner =                THIS_MODULE,
         .open =                 pkt_open,
         .release =              pkt_close,
-        .unlocked_ioctl =       pkt_ioctl,
+        .ioctl =                pkt_ioctl,
         .media_changed =        pkt_media_changed,
 };
 
@@ -3023,8 +3015,7 @@ static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
         mutex_unlock(&ctl_mutex);
 }
 
-static long pkt_ctl_ioctl(struct file *file, unsigned int cmd,
-                                                unsigned long arg)
+static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 {
         void __user *argp = (void __user *)arg;
         struct pkt_ctrl_command ctrl_cmd;
@@ -3041,22 +3032,16 @@ static long pkt_ctl_ioctl(struct file *file, unsigned int cmd,
         case PKT_CTRL_CMD_SETUP:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                lock_kernel();
                 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
                 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
-                unlock_kernel();
                 break;
         case PKT_CTRL_CMD_TEARDOWN:
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
-                lock_kernel();
                 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
-                unlock_kernel();
                 break;
         case PKT_CTRL_CMD_STATUS:
-                lock_kernel();
                 pkt_get_status(&ctrl_cmd);
-                unlock_kernel();
                 break;
         default:
                 return -ENOTTY;
@@ -3069,7 +3054,7 @@ static long pkt_ctl_ioctl(struct file *file, unsigned int cmd,
 
 
 static const struct file_operations pkt_ctl_fops = {
-        .unlocked_ioctl  = pkt_ctl_ioctl,
+        .ioctl   = pkt_ctl_ioctl,
         .owner   = THIS_MODULE,
 };