From patchwork Fri May 2 04:29:34 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 4100941 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 04C449F1E1 for ; Fri, 2 May 2014 04:30:08 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1BD5F20377 for ; Fri, 2 May 2014 04:30:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3C66C20380 for ; Fri, 2 May 2014 04:30:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751407AbaEBE3n (ORCPT ); Fri, 2 May 2014 00:29:43 -0400 Received: from xavier.telenet-ops.be ([195.130.132.52]:52778 "EHLO xavier.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751402AbaEBE3m (ORCPT ); Fri, 2 May 2014 00:29:42 -0400 Received: from ayla.of.borg ([84.193.72.141]) by xavier.telenet-ops.be with bizsmtp id wsVg1n00C32ts5g01sVgxg; Fri, 02 May 2014 06:29:41 +0200 Received: from geert by ayla.of.borg with local (Exim 4.76) (envelope-from ) id 1Wg56S-000566-MU; Fri, 02 May 2014 06:29:40 +0200 From: Geert Uytterhoeven To: Mark Brown Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH] spi: core: Protect DMA code by #ifdef CONFIG_HAS_DMA Date: Fri, 2 May 2014 06:29:34 +0200 Message-Id: <1399004974-19566-1-git-send-email-geert@linux-m68k.org> X-Mailer: git-send-email 1.7.9.5 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If NO_DMA=y: drivers/built-in.o: In function `spi_map_buf': spi.c:(.text+0x21bc60): undefined reference to `dma_map_sg' drivers/built-in.o: In function `spi_unmap_buf.isra.33': spi.c:(.text+0x21c32e): undefined reference to `dma_unmap_sg' make[3]: *** [vmlinux] Error 1 Protect the DMA code by #ifdef CONFIG_HAS_DMA to fix this: - Extract __spi_map_msg() from spi_map_msg(), - Provide dummy definitions of __spi_map_msg() and spi_unmap_msg() if !CONFIG_HAS_DMA. Signed-off-by: Geert Uytterhoeven --- drivers/spi/spi.c | 109 ++++++++++++++++++++++++++++++++--------------------- 1 file changed, 65 insertions(+), 44 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 4eb9bf02996c..341942b640e1 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -580,6 +580,7 @@ static void spi_set_cs(struct spi_device *spi, bool enable) spi->master->set_cs(spi, !enable); } +#ifdef CONFIG_HAS_DMA static int spi_map_buf(struct spi_master *master, struct device *dev, struct sg_table *sgt, void *buf, size_t len, enum dma_data_direction dir) @@ -637,55 +638,12 @@ static void spi_unmap_buf(struct spi_master *master, struct device *dev, } } -static int spi_map_msg(struct spi_master *master, struct spi_message *msg) +static int __spi_map_msg(struct spi_master *master, struct spi_message *msg) { struct device *tx_dev, *rx_dev; struct spi_transfer *xfer; - void *tmp; - unsigned int max_tx, max_rx; int ret; - if (master->flags & (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX)) { - max_tx = 0; - max_rx = 0; - - list_for_each_entry(xfer, &msg->transfers, transfer_list) { - if ((master->flags & SPI_MASTER_MUST_TX) && - !xfer->tx_buf) - max_tx = max(xfer->len, max_tx); - if ((master->flags & SPI_MASTER_MUST_RX) && - !xfer->rx_buf) - max_rx = max(xfer->len, max_rx); - } - - if (max_tx) { - tmp = krealloc(master->dummy_tx, max_tx, - GFP_KERNEL | GFP_DMA); - if (!tmp) - return -ENOMEM; - master->dummy_tx = tmp; - memset(tmp, 0, max_tx); - } - - if (max_rx) { - tmp = krealloc(master->dummy_rx, max_rx, - GFP_KERNEL | GFP_DMA); - if (!tmp) - return -ENOMEM; - master->dummy_rx = tmp; - } - - if (max_tx || max_rx) { - list_for_each_entry(xfer, &msg->transfers, - transfer_list) { - if (!xfer->tx_buf) - xfer->tx_buf = master->dummy_tx; - if (!xfer->rx_buf) - xfer->rx_buf = master->dummy_rx; - } - } - } - if (!master->can_dma) return 0; @@ -742,6 +700,69 @@ static int spi_unmap_msg(struct spi_master *master, struct spi_message *msg) return 0; } +#else /* !CONFIG_HAS_DMA */ +static inline int __spi_map_msg(struct spi_master *master, + struct spi_message *msg) +{ + return 0; +} + +static inline int spi_unmap_msg(struct spi_master *master, + struct spi_message *msg) +{ + return 0; +} +#endif /* !CONFIG_HAS_DMA */ + +static int spi_map_msg(struct spi_master *master, struct spi_message *msg) +{ + struct spi_transfer *xfer; + void *tmp; + unsigned int max_tx, max_rx; + + if (master->flags & (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX)) { + max_tx = 0; + max_rx = 0; + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if ((master->flags & SPI_MASTER_MUST_TX) && + !xfer->tx_buf) + max_tx = max(xfer->len, max_tx); + if ((master->flags & SPI_MASTER_MUST_RX) && + !xfer->rx_buf) + max_rx = max(xfer->len, max_rx); + } + + if (max_tx) { + tmp = krealloc(master->dummy_tx, max_tx, + GFP_KERNEL | GFP_DMA); + if (!tmp) + return -ENOMEM; + master->dummy_tx = tmp; + memset(tmp, 0, max_tx); + } + + if (max_rx) { + tmp = krealloc(master->dummy_rx, max_rx, + GFP_KERNEL | GFP_DMA); + if (!tmp) + return -ENOMEM; + master->dummy_rx = tmp; + } + + if (max_tx || max_rx) { + list_for_each_entry(xfer, &msg->transfers, + transfer_list) { + if (!xfer->tx_buf) + xfer->tx_buf = master->dummy_tx; + if (!xfer->rx_buf) + xfer->rx_buf = master->dummy_rx; + } + } + } + + return __spi_map_msg(master, msg); +} /* * spi_transfer_one_message - Default implementation of transfer_one_message()