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| author | Stefan Agner <stefan@agner.ch> | 2015-01-26 01:10:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-02-02 10:09:55 -0800 |
| commit | bfc2e07f910891516c8eeef61859fa17369fea9f (patch) | |
| tree | dff78a4eb45e351e013a09253e06debddfcb1a81 /tools/perf/scripts/python | |
| parent | serial: fsl-lpuart: disable interrupt when suspend (diff) | |
| download | linux-bfc2e07f910891516c8eeef61859fa17369fea9f.tar.gz linux-bfc2e07f910891516c8eeef61859fa17369fea9f.zip | |
tty: serial: fsl_lpuart: terminate DMA on buffer flush
On uart buffer flush, serial core resets the circular buffer.
If a DMA transfer is in progress at that time, the callback
lpuart_dma_tx_complete will move buffer's tail unconditionally,
hence tail moves beyond head. Use the flush_buffer hook to
terminate the DMA imeaditely and avoid lpuart_dma_tx_complete
being called in this situation.
This bug often showed up while shutdown and lead to duplicate
serial console output.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions