[S390] tape: remove BKL from tape driver

Replace BLK with a per device mutex.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h
index fbe41e0..7a242f0 100644 (file)
--- a/drivers/s390/char/tape.h
+++ b/drivers/s390/char/tape.h
@@ -212,6 +212,9 @@ struct tape_device {
        struct tape_class_device *      nt;
        struct tape_class_device *      rt;
 
+       /* Device mutex to serialize tape commands. */
+       struct mutex                    mutex;
+
        /* Device discipline information. */
        struct tape_discipline *        discipline;
        void *                          discdata;

diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index c97c6aa..4799cc2 100644 (file)
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -54,7 +54,7 @@ static const struct block_device_operations tapeblock_fops = {
        .owner           = THIS_MODULE,
        .open            = tapeblock_open,
        .release         = tapeblock_release,
-       .locked_ioctl           = tapeblock_ioctl,
+       .ioctl           = tapeblock_ioctl,
        .media_changed   = tapeblock_medium_changed,
        .revalidate_disk = tapeblock_revalidate_disk,
 };

diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c
index d44e698..23d773a 100644 (file)
--- a/drivers/s390/char/tape_char.c
+++ b/drivers/s390/char/tape_char.c
@@ -33,8 +33,7 @@ static ssize_t tapechar_read(struct file *, char __user *, size_t, loff_t *);
 static ssize_t tapechar_write(struct file *, const char __user *, size_t, loff_t *);
 static int tapechar_open(struct inode *,struct file *);
 static int tapechar_release(struct inode *,struct file *);
-static int tapechar_ioctl(struct inode *, struct file *, unsigned int,
-                         unsigned long);
+static long tapechar_ioctl(struct file *, unsigned int, unsigned long);
 static long tapechar_compat_ioctl(struct file *, unsigned int,
                          unsigned long);
 
@@ -43,7 +42,7 @@ static const struct file_operations tape_fops =
        .owner = THIS_MODULE,
        .read = tapechar_read,
        .write = tapechar_write,
-       .ioctl = tapechar_ioctl,
+       .unlocked_ioctl = tapechar_ioctl,
        .compat_ioctl = tapechar_compat_ioctl,
        .open = tapechar_open,
        .release = tapechar_release,
@@ -284,26 +283,20 @@ tapechar_open (struct inode *inode, struct file *filp)
        if (imajor(filp->f_path.dentry->d_inode) != tapechar_major)
                return -ENODEV;
 
-       lock_kernel();
        minor = iminor(filp->f_path.dentry->d_inode);
        device = tape_find_device(minor / TAPE_MINORS_PER_DEV);
        if (IS_ERR(device)) {
                DBF_EVENT(3, "TCHAR:open: tape_find_device() failed\n");
-               rc = PTR_ERR(device);
-               goto out;
+               return PTR_ERR(device);
        }
 
-
        rc = tape_open(device);
        if (rc == 0) {
                filp->private_data = device;
-               rc = nonseekable_open(inode, filp);
-       }
-       else
+               nonseekable_open(inode, filp);
+       } else
                tape_put_device(device);
 
-out:
-       unlock_kernel();
        return rc;
 }
 
@@ -350,16 +343,11 @@ tapechar_release(struct inode *inode, struct file *filp)
  * Tape device io controls.
  */
 static int
-tapechar_ioctl(struct inode *inp, struct file *filp,
-              unsigned int no, unsigned long data)
+__tapechar_ioctl(struct tape_device *device,
+                unsigned int no, unsigned long data)
 {
-       struct tape_device *device;
        int rc;
 
-       DBF_EVENT(6, "TCHAR:ioct\n");
-
-       device = (struct tape_device *) filp->private_data;
-
        if (no == MTIOCTOP) {
                struct mtop op;
 
@@ -452,15 +440,30 @@ tapechar_ioctl(struct inode *inp, struct file *filp,
 }
 
 static long
+tapechar_ioctl(struct file *filp, unsigned int no, unsigned long data)
+{
+       struct tape_device *device;
+       long rc;
+
+       DBF_EVENT(6, "TCHAR:ioct\n");
+
+       device = (struct tape_device *) filp->private_data;
+       mutex_lock(&device->mutex);
+       rc = __tapechar_ioctl(device, no, data);
+       mutex_unlock(&device->mutex);
+       return rc;
+}
+
+static long
 tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data)
 {
        struct tape_device *device = filp->private_data;
        int rval = -ENOIOCTLCMD;
 
        if (device->discipline->ioctl_fn) {
-               lock_kernel();
+               mutex_lock(&device->mutex);
                rval = device->discipline->ioctl_fn(device, no, data);
-               unlock_kernel();
+               mutex_unlock(&device->mutex);
                if (rval == -EINVAL)
                        rval = -ENOIOCTLCMD;
        }

diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c
index a7b7e72..f5d6802 100644 (file)
--- a/drivers/s390/char/tape_core.c
+++ b/drivers/s390/char/tape_core.c
@@ -492,6 +492,7 @@ tape_alloc_device(void)
                kfree(device);
                return ERR_PTR(-ENOMEM);
        }
+       mutex_init(&device->mutex);
        INIT_LIST_HEAD(&device->req_queue);
        INIT_LIST_HEAD(&device->node);
        init_waitqueue_head(&device->state_change_wq);