diff options
| -rw-r--r-- | drivers/staging/vme/devices/vme_user.c | 73 |
1 files changed, 24 insertions, 49 deletions
diff --git a/drivers/staging/vme/devices/vme_user.c b/drivers/staging/vme/devices/vme_user.c index 3467cde..a2345db 100644 --- a/drivers/staging/vme/devices/vme_user.c +++ b/drivers/staging/vme/devices/vme_user.c @@ -120,75 +120,50 @@ struct vme_user_vma_priv { atomic_t refcnt; }; -/* - * We are going ot alloc a page during init per window for small transfers. - * Small transfers will go VME -> buffer -> user space. Larger (more than a - * page) transfers will lock the user space buffer into memory and then - * transfer the data directly into the user space buffers. - */ static ssize_t resource_to_user(int minor, char __user *buf, size_t count, loff_t *ppos) { ssize_t retval; ssize_t copied = 0; - if (count <= image[minor].size_buf) { - /* We copy to kernel buffer */ - copied = vme_master_read(image[minor].resource, - image[minor].kern_buf, count, *ppos); - if (copied < 0) - return (int)copied; - - retval = __copy_to_user(buf, image[minor].kern_buf, - (unsigned long)copied); - if (retval != 0) { - copied = (copied - retval); - pr_info("User copy failed\n"); - return -EINVAL; - } + if (count > image[minor].size_buf) + count = image[minor].size_buf; - } else { - /* XXX Need to write this */ - pr_info("Currently don't support large transfers\n"); - /* Map in pages from userspace */ + /* We copy to kernel buffer */ + copied = vme_master_read(image[minor].resource, image[minor].kern_buf, + count, *ppos); + if (copied < 0) + return (int)copied; - /* Call vme_master_read to do the transfer */ + retval = __copy_to_user(buf, image[minor].kern_buf, + (unsigned long)copied); + if (retval != 0) { + copied = (copied - retval); + pr_info("User copy failed\n"); return -EINVAL; } return copied; } -/* - * We are going to alloc a page during init per window for small transfers. - * Small transfers will go user space -> buffer -> VME. Larger (more than a - * page) transfers will lock the user space buffer into memory and then - * transfer the data directly from the user space buffers out to VME. - */ static ssize_t resource_from_user(unsigned int minor, const char __user *buf, size_t count, loff_t *ppos) { ssize_t retval; ssize_t copied = 0; - if (count <= image[minor].size_buf) { - retval = __copy_from_user(image[minor].kern_buf, buf, - (unsigned long)count); - if (retval != 0) - copied = (copied - retval); - else - copied = count; - - copied = vme_master_write(image[minor].resource, - image[minor].kern_buf, copied, *ppos); - } else { - /* XXX Need to write this */ - pr_info("Currently don't support large transfers\n"); - /* Map in pages from userspace */ - - /* Call vme_master_write to do the transfer */ - return -EINVAL; - } + if (count > image[minor].size_buf) + count = image[minor].size_buf; + + retval = __copy_from_user(image[minor].kern_buf, buf, + (unsigned long)count); + if (retval != 0) + copied = (copied - retval); + else + copied = count; + + copied = vme_master_write(image[minor].resource, image[minor].kern_buf, + copied, *ppos); return copied; } |