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Ian Jackson authored
Do not read IIR in serial8250_start_tx when UART_BUG_TXEN Reading the IIR clears some oustanding interrupts so it is not safe. Instead, simply transmit immediately if the buffer is empty without regard to IIR. Signed-off-by:
Ian Jackson <ian.jackson@eu.citrix.com> Reviewed-by:
Markus Armbruster <armbru@redhat.com> Reviewed-by:
Jiri Kosina <jkosina@suse.cz> Cc: Alan Cox <alan@linux.intel.com> Cc: stable <stable@kernel.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
68cb4f8e