Staging: vme: llseek support in user driver
Provide vme_user_llseek() implementation.
Signed-off-by: Arthur Benilov <arthur.benilov@iba-group.com>
Signed-off-by: Vincent Bossier <vincent.bossier@iba-group.com>
Acked-by: Martyn Welch <martyn.welch@ge.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/vme/devices/vme_user.c b/drivers/staging/vme/devices/vme_user.c
index 48d46ca..ddecbe5 100644
--- a/drivers/staging/vme/devices/vme_user.c
+++ b/drivers/staging/vme/devices/vme_user.c
@@ -400,8 +400,39 @@
static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
{
- printk(KERN_ERR "Llseek currently incomplete\n");
- return -EINVAL;
+ loff_t absolute = -1;
+ unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
+ size_t image_size;
+
+ down(&image[minor].sem);
+ image_size = vme_get_size(image[minor].resource);
+
+ switch (whence) {
+ case SEEK_SET:
+ absolute = off;
+ break;
+ case SEEK_CUR:
+ absolute = file->f_pos + off;
+ break;
+ case SEEK_END:
+ absolute = image_size + off;
+ break;
+ default:
+ up(&image[minor].sem);
+ return -EINVAL;
+ break;
+ }
+
+ if ((absolute < 0) || (absolute >= image_size)) {
+ up(&image[minor].sem);
+ return -EINVAL;
+ }
+
+ file->f_pos = absolute;
+
+ up(&image[minor].sem);
+
+ return absolute;
}
/*