3 files changed, 7 insertions, 7 deletions

diff --git a/drivers/serial/sb1250-duart.c b/drivers/serial/sb1250-duart.c
index a4fb343a08da..319e8b83f6be 100644
--- a/drivers/serial/sb1250-duart.c
+++ b/drivers/serial/sb1250-duart.c
@@ -204,7 +204,7 @@ static int sbd_receive_drain(struct sbd_port *sport)
 {
         int loops = 10000;
 
-        while (sbd_receive_ready(sport) && loops--)
+        while (sbd_receive_ready(sport) && --loops)
                 read_sbdchn(sport, R_DUART_RX_HOLD);
         return loops;
 }
@@ -218,7 +218,7 @@ static int __maybe_unused sbd_transmit_drain(struct sbd_port *sport)
 {
         int loops = 10000;
 
-        while (!sbd_transmit_ready(sport) && loops--)
+        while (!sbd_transmit_ready(sport) && --loops)
                 udelay(2);
         return loops;
 }
@@ -232,7 +232,7 @@ static int sbd_line_drain(struct sbd_port *sport)
 {
         int loops = 10000;
 
-        while (!sbd_transmit_empty(sport) && loops--)
+        while (!sbd_transmit_empty(sport) && --loops)
                 udelay(2);
         return loops;
 }
diff --git a/drivers/serial/sunhv.c b/drivers/serial/sunhv.c
index a94a2ab4b571..1df5325faab2 100644
--- a/drivers/serial/sunhv.c
+++ b/drivers/serial/sunhv.c
@@ -461,7 +461,7 @@ static void sunhv_console_write_paged(struct console *con, const char *s, unsign
                                         break;
                                 udelay(1);
                         }
-                        if (limit <= 0)
+                        if (limit < 0)
                                 break;
                         page_bytes -= written;
                         ra += written;
diff --git a/drivers/serial/zs.c b/drivers/serial/zs.c
index 9e6a873f8203..d8c2809b1ab6 100644
--- a/drivers/serial/zs.c
+++ b/drivers/serial/zs.c
@@ -231,7 +231,7 @@ static int zs_receive_drain(struct zs_port *zport)
 {
         int loops = 10000;
 
-        while ((read_zsreg(zport, R0) & Rx_CH_AV) && loops--)
+        while ((read_zsreg(zport, R0) & Rx_CH_AV) && --loops)
                 read_zsdata(zport);
         return loops;
 }
@@ -241,7 +241,7 @@ static int zs_transmit_drain(struct zs_port *zport, int irq)
         struct zs_scc *scc = zport->scc;
         int loops = 10000;
 
-        while (!(read_zsreg(zport, R0) & Tx_BUF_EMP) && loops--) {
+        while (!(read_zsreg(zport, R0) & Tx_BUF_EMP) && --loops) {
                 zs_spin_unlock_cond_irq(&scc->zlock, irq);
                 udelay(2);
                 zs_spin_lock_cond_irq(&scc->zlock, irq);
@@ -254,7 +254,7 @@ static int zs_line_drain(struct zs_port *zport, int irq)
         struct zs_scc *scc = zport->scc;
         int loops = 10000;
 
-        while (!(read_zsreg(zport, R1) & ALL_SNT) && loops--) {
+        while (!(read_zsreg(zport, R1) & ALL_SNT) && --loops) {
                 zs_spin_unlock_cond_irq(&scc->zlock, irq);
                 udelay(2);
                 zs_spin_lock_cond_irq(&scc->zlock, irq);