2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Maciej Sosnowski commit c2c0b4c5434c0a25f7f7796b29155d53805909f5 upstream Error handling needs to be modified in dma_pin_iovec_pages(). It should return NULL instead of ERR_PTR (pinned_list is checked for NULL in tcp_recvmsg() to determine if iovec pages have been successfully pinned down). In case of error for the first iovec, local_list->nr_iovecs needs to be initialized. Signed-off-by: Maciej Sosnowski Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/dma/iovlock.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) --- a/drivers/dma/iovlock.c +++ b/drivers/dma/iovlock.c @@ -55,7 +55,6 @@ struct dma_pinned_list *dma_pin_iovec_pa 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_pa 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_pa NULL); up_read(¤t->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_pa 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) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/