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serial: pl011: Avoid assumptions about buffer size when refilling TX DMA 

The existing code assumed that PL011_DMA_BUFFER_SIZE == UART_XMIT_SIZE,
which may not always be the case.  This allows for these two being
different sizes and not copying too much data.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrew Jackson 2014-11-07 14:14:39 +00:00 committed by Greg Kroah-Hartman
parent 4c0be45b18
commit e2a545a6ae
1 changed files with 5 additions and 1 deletions
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6
drivers/tty/serial/amba-pl011.c
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@ -501,7 +501,11 @@ static int pl011_dma_tx_refill(struct uart_amba_port *uap)
memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], count);
else {
size_t first = UART_XMIT_SIZE - xmit->tail;
size_t second = xmit->head;
size_t second;
if (first > count)
first = count;
second = count - first;
memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], first);
if (second)