serial: samsung: Use right device for DMA-mapping calls

commit 768d64f491a530062ddad50e016fb27125f8bd7c upstream.

Driver should provide its own struct device for all DMA-mapping calls instead
of extracting device pointer from DMA engine channel. Although this is harmless
from the driver operation perspective on ARM architecture, it is always good
to use the DMA mapping API in a proper way. This patch fixes following DMA API
debug warning:

WARNING: CPU: 0 PID: 0 at lib/dma-debug.c:1241 check_sync+0x520/0x9f4
samsung-uart 12c20000.serial: DMA-API: device driver tries to sync DMA memory it has not allocated [device address=0x000000006df0f580] [size=64 bytes]
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.11.0-rc1-00137-g07ca963 #51
Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[<c011aaa4>] (unwind_backtrace) from [<c01127c0>] (show_stack+0x20/0x24)
[<c01127c0>] (show_stack) from [<c06ba5d8>] (dump_stack+0x84/0xa0)
[<c06ba5d8>] (dump_stack) from [<c0139528>] (__warn+0x14c/0x180)
[<c0139528>] (__warn) from [<c01395a4>] (warn_slowpath_fmt+0x48/0x50)
[<c01395a4>] (warn_slowpath_fmt) from [<c0729058>] (check_sync+0x520/0x9f4)
[<c0729058>] (check_sync) from [<c072967c>] (debug_dma_sync_single_for_device+0x88/0xc8)
[<c072967c>] (debug_dma_sync_single_for_device) from [<c0803c10>] (s3c24xx_serial_start_tx_dma+0x100/0x2f8)
[<c0803c10>] (s3c24xx_serial_start_tx_dma) from [<c0804338>] (s3c24xx_serial_tx_chars+0x198/0x33c)

Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Fixes: 62c37eedb74c8 ("serial: samsung: add dma reqest/release functions")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 3e2ef4fd738251645a6e5d75efb0cd20df41b329..d65f92bcd0f19a3ccf1e6bb7ce5c05d5f72c8428 100644 (file)
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -906,14 +906,13 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
                return -ENOMEM;
        }
 
-       dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
+       dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf,
                                dma->rx_size, DMA_FROM_DEVICE);
 
        spin_lock_irqsave(&p->port.lock, flags);
 
        /* TX buffer */
-       dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
-                               p->port.state->xmit.buf,
+       dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf,
                                UART_XMIT_SIZE, DMA_TO_DEVICE);
 
        spin_unlock_irqrestore(&p->port.lock, flags);
@@ -927,7 +926,7 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
 
        if (dma->rx_chan) {
                dmaengine_terminate_all(dma->rx_chan);
-               dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
+               dma_unmap_single(p->port.dev, dma->rx_addr,
                                dma->rx_size, DMA_FROM_DEVICE);
                kfree(dma->rx_buf);
                dma_release_channel(dma->rx_chan);
@@ -936,7 +935,7 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
 
        if (dma->tx_chan) {
                dmaengine_terminate_all(dma->tx_chan);
-               dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
+               dma_unmap_single(p->port.dev, dma->tx_addr,
                                UART_XMIT_SIZE, DMA_TO_DEVICE);
                dma_release_channel(dma->tx_chan);
                dma->tx_chan = NULL;