sparc: prom: Sanitize return value from prom_nbputchar()

Signed-off-by: Julian Calaby <julian.calaby@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/sparc/prom/console_32.c b/arch/sparc/prom/console_32.c
index 48863108a44c..b05e3db5fa63 100644
--- a/arch/sparc/prom/console_32.c
+++ b/arch/sparc/prom/console_32.c
@@ -27,13 +27,14 @@ static int prom_nbputchar(const char *buf)
         spin_lock_irqsave(&prom_lock, flags);
         switch(prom_vers) {
         case PROM_V0:
-                i = (*(romvec->pv_nbputchar))(*buf);
+                if ((*(romvec->pv_nbputchar))(*buf))
+                        i = 1;
                 break;
         case PROM_V2:
         case PROM_V3:
                 if ((*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout,
                                                           buf, 0x1) == 1)
-                        i = 0;
+                        i = 1;
                 break;
         default:
                 break;
@@ -47,7 +48,7 @@ void prom_console_write_buf(const char *buf, int len)
 {
         while (len) {
                 int n = prom_nbputchar(buf);
-                if (n)
+                if (n < 0)
                         continue;
                 len--;
                 buf++;