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tty: serial: 8250: omap: synchronize rx_running
The rx_running flag should show if DMA is currently active. However there is a window between when the flag is set/cleared and when the DMA is started/stopped. Because the flag is queried from both hard and soft irq contexts, the driver can make incorrect decisions and do things like start a DMA transfer using a buffer that is already setup to be used for a DMA transfer. This patch adds a spinlock to synchronize the rx_running flag and close the above mentioned window. Signed-off-by: John Ogness <john.ogness@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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John Ogness
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Greg Kroah-Hartman
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May 6, 2015
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