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ARM: davinci: uncompress.h: bail out if uart not initialized

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Bail out of UART access functions in uncompress.h if the uart
port is not setup. This will happen when booting from DT since
machine type matching does not work in this case. This may also
happen if a correct machine type is not setup by bootloader.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Sekhar Nori 2012-08-28 14:38:05 +05:30
parent 5604f69eec
commit 09aaf994e3
1 changed files with 6 additions and 0 deletions
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6
arch/arm/mach-davinci/include/mach/uncompress.h
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@ -32,6 +32,9 @@ u32 *uart;
/* PORT_16C550A, in polled non-fifo mode */
static void putc(char c)
{
if (!uart)
return;
while (!(uart[UART_LSR] & UART_LSR_THRE))
barrier();
uart[UART_TX] = c;
@ -39,6 +42,9 @@ static void putc(char c)
static inline void flush(void)
{
if (!uart)
return;
while (!(uart[UART_LSR] & UART_LSR_THRE))
barrier();
}