DMAENGINE: COH 901 318 fix bytesleft
[linux-2.6.git] / drivers / dma / iovlock.c
index d637555..c0a272c 100644 (file)
@@ -55,7 +55,6 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
        int nr_iovecs = 0;
        int iovec_len_used = 0;
        int iovec_pages_used = 0;
-       long err;
 
        /* don't pin down non-user-based iovecs */
        if (segment_eq(get_fs(), KERNEL_DS))
@@ -72,23 +71,21 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
        local_list = kmalloc(sizeof(*local_list)
                + (nr_iovecs * sizeof (struct dma_page_list))
                + (iovec_pages_used * sizeof (struct page*)), GFP_KERNEL);
-       if (!local_list) {
-               err = -ENOMEM;
+       if (!local_list)
                goto out;
-       }
 
        /* list of pages starts right after the page list array */
        pages = (struct page **) &local_list->page_list[nr_iovecs];
 
+       local_list->nr_iovecs = 0;
+
        for (i = 0; i < nr_iovecs; i++) {
                struct dma_page_list *page_list = &local_list->page_list[i];
 
                len -= iov[i].iov_len;
 
-               if (!access_ok(VERIFY_WRITE, iov[i].iov_base, iov[i].iov_len)) {
-                       err = -EFAULT;
+               if (!access_ok(VERIFY_WRITE, iov[i].iov_base, iov[i].iov_len))
                        goto unpin;
-               }
 
                page_list->nr_pages = num_pages_spanned(&iov[i]);
                page_list->base_address = iov[i].iov_base;
@@ -109,10 +106,8 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
                        NULL);
                up_read(&current->mm->mmap_sem);
 
-               if (ret != page_list->nr_pages) {
-                       err = -ENOMEM;
+               if (ret != page_list->nr_pages)
                        goto unpin;
-               }
 
                local_list->nr_iovecs = i + 1;
        }
@@ -122,7 +117,7 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len)
 unpin:
        dma_unpin_iovec_pages(local_list);
 out:
-       return ERR_PTR(err);
+       return NULL;
 }
 
 void dma_unpin_iovec_pages(struct dma_pinned_list *pinned_list)
@@ -143,29 +138,6 @@ void dma_unpin_iovec_pages(struct dma_pinned_list *pinned_list)
        kfree(pinned_list);
 }
 
-static dma_cookie_t dma_memcpy_to_kernel_iovec(struct dma_chan *chan, struct
-       iovec *iov, unsigned char *kdata, size_t len)
-{
-       dma_cookie_t dma_cookie = 0;
-
-       while (len > 0) {
-               if (iov->iov_len) {
-                       int copy = min_t(unsigned int, iov->iov_len, len);
-                       dma_cookie = dma_async_memcpy_buf_to_buf(
-                                       chan,
-                                       iov->iov_base,
-                                       kdata,
-                                       copy);
-                       kdata += copy;
-                       len -= copy;
-                       iov->iov_len -= copy;
-                       iov->iov_base += copy;
-               }
-               iov++;
-       }
-
-       return dma_cookie;
-}
 
 /*
  * We have already pinned down the pages we will be using in the iovecs.
@@ -187,10 +159,6 @@ dma_cookie_t dma_memcpy_to_iovec(struct dma_chan *chan, struct iovec *iov,
        if (!chan)
                return memcpy_toiovec(iov, kdata, len);
 
-       /* -> kernel copies (e.g. smbfs) */
-       if (!pinned_list)
-               return dma_memcpy_to_kernel_iovec(chan, iov, kdata, len);
-
        iovec_idx = 0;
        while (iovec_idx < pinned_list->nr_iovecs) {
                struct dma_page_list *page_list;
@@ -215,6 +183,11 @@ dma_cookie_t dma_memcpy_to_iovec(struct dma_chan *chan, struct iovec *iov,
                                        iov_byte_offset,
                                        kdata,
                                        copy);
+                       /* poll for a descriptor slot */
+                       if (unlikely(dma_cookie < 0)) {
+                               dma_async_issue_pending(chan);
+                               continue;
+                       }
 
                        len -= copy;
                        iov[iovec_idx].iov_len -= copy;
@@ -280,6 +253,11 @@ dma_cookie_t dma_memcpy_pg_to_iovec(struct dma_chan *chan, struct iovec *iov,
                                        page,
                                        offset,
                                        copy);
+                       /* poll for a descriptor slot */
+                       if (unlikely(dma_cookie < 0)) {
+                               dma_async_issue_pending(chan);
+                               continue;
+                       }
 
                        len -= copy;
                        iov[iovec_idx].iov_len -= copy;