serial: tegra: Correct error handling on DMA setup

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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>

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Jon Hunter 2015-05-05 15:17:59 +01:00 • committed by Greg Kroah-Hartman

parent d92aca3a76

commit ad909b3f8b

1 changed files with 28 additions and 23 deletions

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drivers/tty/serial/serial-tegra.c

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