ANDROID: tty: hvc_dcc: Save irq flags when locking
Disable interrupts when using DCC fifo to prevent deadlock if interrupt occurs that causes a console write. Bug: 175415911 Fixes: 61d87acb ("FROMLIST: hvc_dcc: bind driver to core0 for reads and writes") Change-Id: I645bafef1d8bc58ee93b086b46d822c046aece2d Signed-off-by:Elliot Berman <eberman@codeaurora.org>
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