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efc176929a
We should validate if the 'sup' is NULL or not before freeing DMA memory, to fix below warning. "drivers/tty/serial/sprd_serial.c:1141 sprd_remove() error: we previously assumed 'sup' could be null (see line 1132)" Fixes: f4487db58eb7 ("serial: sprd: Add DMA mode support") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Lanqing Liu <liuhhome@gmail.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/e2bd92691538e95b04a2c2a728f3292e1617018f.1584325957.git.liuhhome@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>