We have some code in udbg_uart_getc_poll that tries to protect
against a NULL udbg_uart_in, but gets it all wrong.
Found with the LLVM static analyzer (scan-build).
Fixes: 309257484cc1 ("powerpc: Cleanup udbg_16550 and add support for LPC
PIO-only UARTs")
Cc: sta...@vger.kernel.org
Signed-off-by: Anton Blanchard <an...@samba.org>
---
arch/powerpc/kernel/udbg_16550.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c
index 6e7c492..3faf393 100644
--- a/arch/powerpc/kernel/udbg_16550.c
+++ b/arch/powerpc/kernel/udbg_16550.c
@@ -69,7 +69,9 @@ static void udbg_uart_putc(char c)
static int udbg_uart_getc_poll(void)
{
- if (!udbg_uart_in || !(udbg_uart_in(UART_LSR) & LSR_DR))
+ if (!udbg_uart_in)
+ return -1;
+ if (!(udbg_uart_in(UART_LSR) & LSR_DR))
return udbg_uart_in(UART_RBR);
return -1;
}
--
1.9.1
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