vhost: vhost_scsi_handle_vq() should just use copy_from_user()

it has just verified that it asks no more than the length of the
first segment of iovec.

And with that the last user of stuff in lib/iovec.c is gone.
RIP.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Nicholas A. Bellinger <nab@linux-iscsi.org>
Cc: kvm@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index d695b16..dc78d87 100644 (file)
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1079,7 +1079,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
                               req_size, vq->iov[0].iov_len);
                        break;
                }
-               ret = memcpy_fromiovecend(req, &vq->iov[0], 0, req_size);
+               ret = copy_from_user(req, vq->iov[0].iov_base, req_size);
                if (unlikely(ret)) {
                        vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
                        break;

diff --git a/include/linux/uio.h b/include/linux/uio.h
index 02bd8a9..3e0cb4e 100644 (file)
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -135,6 +135,4 @@ static inline void iov_iter_reexpand(struct iov_iter *i, size_t count)
 size_t csum_and_copy_to_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i);
 size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i);
 
-int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
-                       int offset, int len);
 #endif

diff --git a/lib/Makefile b/lib/Makefile
index 3c3b30b..1071d06 100644 (file)
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -24,7 +24,7 @@ obj-y += lockref.o
 
 obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
         bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
-        gcd.o lcm.o list_sort.o uuid.o flex_array.o iovec.o clz_ctz.o \
+        gcd.o lcm.o list_sort.o uuid.o flex_array.o clz_ctz.o \
         bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o kfifo.o \
         percpu-refcount.o percpu_ida.o rhashtable.o reciprocal_div.o
 obj-y += string_helpers.o

diff --git a/lib/iovec.c b/lib/iovec.c
deleted file mode 100644 (file)
index d8f17a9..0000000
--- a/lib/iovec.c
+++ /dev/null
@@ -1,36 +0,0 @@
-#include <linux/uaccess.h>
-#include <linux/export.h>
-#include <linux/uio.h>
-
-/*
- *     Copy iovec to kernel. Returns -EFAULT on error.
- */
-
-int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
-                       int offset, int len)
-{
-       /* No data? Done! */
-       if (len == 0)
-               return 0;
-
-       /* Skip over the finished iovecs */
-       while (offset >= iov->iov_len) {
-               offset -= iov->iov_len;
-               iov++;
-       }
-
-       while (len > 0) {
-               u8 __user *base = iov->iov_base + offset;
-               int copy = min_t(unsigned int, len, iov->iov_len - offset);
-
-               offset = 0;
-               if (copy_from_user(kdata, base, copy))
-                       return -EFAULT;
-               len -= copy;
-               kdata += copy;
-               iov++;
-       }
-
-       return 0;
-}
-EXPORT_SYMBOL(memcpy_fromiovecend);