[PATCH] serial: sh-sci: Fix panic when serial console and DMA are enabled

From: Takatoshi Akiyama This patch fixes an issue that kernel panic happens when DMA is enabled and we press enter key while the kernel booting on the serial console. * An interrupt may occur after sci_request_irq(). * DMA transfer area is

[PATCH] serial: sh-sci: Fix panic when serial console and DMA are enabled

From: Takatoshi Akiyama This patch fixes an issue that kernel panic happens when DMA is enabled and we press enter key while the kernel booting on the serial console. * An interrupt may occur after sci_request_irq(). * DMA transfer area is initialized by setup_timer() in sci_request_dma() and