tree 4451c62fde6d0ca954d6d329fbe63468fc55abeb
parent d92aca3a76662d2da8fe843ab124c45b47ea127d
author Jon Hunter <jonathanh@nvidia.com> 1430835479 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1431277939 +0200

serial: tegra: Correct error handling on DMA setup

Function tegra_uart_dma_channel_allocate() does not check that
dma_map_single() mapped the DMA buffer correctly. Add a check for this
and appropriate error handling.

Furthermore, if dmaengine_slave_config() (called by
tegra_uart_dma_channel_allocate()) fails, then memory allocated/mapped
is not freed/unmapped. Therefore, call tegra_uart_dma_channel_free()
instead of just dma_release_channel() if  dmaengine_slave_config() fails.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>