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serial: tegra: Fix memory leak on DMA setup failure 

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 <acourbot@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jon Hunter 2015-05-20 12:21:04 +01:00 committed by Greg Kroah-Hartman
parent c35b49b716
commit 8f8e48f4d6
1 changed files with 11 additions and 21 deletions
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32
drivers/tty/serial/serial-tegra.c
View File

@ -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)