If the call to dmaengine_slave_config() fails, then the DMA buffer will
not be freed/unmapped. Fix this by moving the code that stores the
address of the buffer in the tegra_uart_port structure to before the
call to dmaengine_slave_config().
Reported-by: Alexandre Courbot <acour...@nvidia.com>
Signed-off-by: Jon Hunter <jonath...@nvidia.com>
---
drivers/tty/serial/serial-tegra.c | 32 +++++++++++---------------------
1 file changed, 11 insertions(+), 21 deletions(-)
diff --git a/drivers/tty/serial/serial-tegra.c
b/drivers/tty/serial/serial-tegra.c
index 3b63f103f0c9..cf0133ae762d 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -999,6 +999,12 @@ static int tegra_uart_dma_channel_allocate(struct
tegra_uart_port *tup,
dma_release_channel(dma_chan);
return -ENOMEM;
}
+ dma_sconfig.src_addr = tup->uport.mapbase;
+ dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ dma_sconfig.src_maxburst = 4;
+ tup->rx_dma_chan = dma_chan;
+ tup->rx_dma_buf_virt = dma_buf;
+ tup->rx_dma_buf_phys = dma_phys;
} else {
dma_phys = dma_map_single(tup->uport.dev,
tup->uport.state->xmit.buf, UART_XMIT_SIZE,
@@ -1009,39 +1015,23 @@ static int tegra_uart_dma_channel_allocate(struct
tegra_uart_port *tup,
return -ENOMEM;
}
dma_buf = tup->uport.state->xmit.buf;
- }
-
- if (dma_to_memory) {
- dma_sconfig.src_addr = tup->uport.mapbase;
- dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- dma_sconfig.src_maxburst = 4;
- } else {
dma_sconfig.dst_addr = tup->uport.mapbase;
dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_sconfig.dst_maxburst = 16;
+ tup->tx_dma_chan = dma_chan;
+ tup->tx_dma_buf_virt = dma_buf;
+ tup->tx_dma_buf_phys = dma_phys;
}
ret = dmaengine_slave_config(dma_chan, &dma_sconfig);
if (ret < 0) {
dev_err(tup->uport.dev,
"Dma slave config failed, err = %d\n", ret);
- goto scrub;
+ tegra_uart_dma_channel_free(tup, dma_to_memory);
+ return ret;
}
- if (dma_to_memory) {
- tup->rx_dma_chan = dma_chan;
- tup->rx_dma_buf_virt = dma_buf;
- tup->rx_dma_buf_phys = dma_phys;
- } else {
- tup->tx_dma_chan = dma_chan;
- tup->tx_dma_buf_virt = dma_buf;
- tup->tx_dma_buf_phys = dma_phys;
- }
return 0;
-
-scrub:
- tegra_uart_dma_channel_free(tup, dma_to_memory);
- return ret;
}
static int tegra_uart_startup(struct uart_port *u)
--
1.9.1
--
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