TTY: synclink: Convert + to | for bit operations

Dan Carpenter noticed a missing set of parentheses
around a multiple field addition.

https://lkml.org/lkml/2013/1/27/166

His original commit message:

There is a kind of precedence problem here, but it doesn't affect how
the code works because ->serial_signals is unsigned char.  We want to
clear two flags here.

#define SerialSignal_RTS            0x20     /* Request to Send */
#define SerialSignal_DTR            0x80     /* Data Terminal Ready */

Without the parenthesis then it does:

	info->serial_signals &= 0x5f;

With the parenthesis it does:

	info->serial_signals &= 0xffffff5f;

info->serial_signals is an unsigned char so the two statements are
equivalent, but it's cleaner to add the parenthesis.  In other dtr_rts()
functions the parenthesis are there so this makes it more consistent.

Other changes:

Convert all + uses to | for these bit operations.

Reorder the multiple fields for consistency.
Update the comments too.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 59 insertions, 59 deletions

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 34e52ed0ea8c..d0c9852ab875 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -1343,7 +1343,7 @@ static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
         reset_device(info);
 
         if (!tty || tty->termios.c_cflag & HUPCL) {
-                info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 set_signals(info);
         }
 
@@ -1405,12 +1405,12 @@ static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
 
         cflag = tty->termios.c_cflag;
 
-        /* if B0 rate (hangup) specified then negate DTR and RTS */
-        /* otherwise assert DTR and RTS */
+        /* if B0 rate (hangup) specified then negate RTS and DTR */
+        /* otherwise assert RTS and DTR */
         if (cflag & CBAUD)
-                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+                info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         else
-                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
 
         /* byte size and parity */
 
@@ -2301,7 +2301,7 @@ static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_term
         /* Handle transition to B0 status */
         if (old_termios->c_cflag & CBAUD &&
             !(tty->termios.c_cflag & CBAUD)) {
-                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 spin_lock_irqsave(&info->lock,flags);
                 set_signals(info);
                 spin_unlock_irqrestore(&info->lock,flags);
@@ -2464,9 +2464,9 @@ static void dtr_rts(struct tty_port *port, int onoff)
 
         spin_lock_irqsave(&info->lock,flags);
         if (onoff)
-                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+                info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         else
-                info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR;
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
         set_signals(info);
         spin_unlock_irqrestore(&info->lock,flags);
 }
@@ -3575,8 +3575,8 @@ static void get_signals(MGSLPC_INFO *info)
 {
         unsigned char status = 0;
 
-        /* preserve DTR and RTS */
-        info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
+        /* preserve RTS and DTR */
+        info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
 
         if (read_reg(info, CHB + VSTR) & BIT7)
                 info->serial_signals |= SerialSignal_DCD;
@@ -3590,7 +3590,7 @@ static void get_signals(MGSLPC_INFO *info)
                 info->serial_signals |= SerialSignal_DSR;
 }
 
-/* Set the state of DTR and RTS based on contents of
+/* Set the state of RTS and DTR based on contents of
  * serial_signals member of device extension.
  */
 static void set_signals(MGSLPC_INFO *info)
@@ -4009,8 +4009,8 @@ static int hdlcdev_open(struct net_device *dev)
                 spin_unlock_irqrestore(&info->netlock, flags);
                 return rc;
         }
-        /* assert DTR and RTS, apply hardware settings */
-        info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        /* assert RTS and DTR, apply hardware settings */
+        info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         mgslpc_program_hw(info, tty);
         tty_kref_put(tty);
 
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 555fdc0ed0f1..8983276aa35e 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -1850,7 +1850,7 @@ static void shutdown(struct mgsl_struct * info)
         usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
 
         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
-                info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 usc_set_serial_signals(info);
         }
 
@@ -1915,12 +1915,12 @@ static void mgsl_change_params(struct mgsl_struct *info)
                          
         cflag = info->port.tty->termios.c_cflag;
 
-        /* if B0 rate (hangup) specified then negate DTR and RTS */
-        /* otherwise assert DTR and RTS */
+        /* if B0 rate (hangup) specified then negate RTS and DTR */
+        /* otherwise assert RTS and DTR */
         if (cflag & CBAUD)
-                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+                info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         else
-                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
         
         /* byte size and parity */
         
@@ -3044,7 +3044,7 @@ static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termio
         /* Handle transition to B0 status */
         if (old_termios->c_cflag & CBAUD &&
             !(tty->termios.c_cflag & CBAUD)) {
-                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 spin_lock_irqsave(&info->irq_spinlock,flags);
                 usc_set_serial_signals(info);
                 spin_unlock_irqrestore(&info->irq_spinlock,flags);
@@ -3243,9 +3243,9 @@ static void dtr_rts(struct tty_port *port, int on)
 
         spin_lock_irqsave(&info->irq_spinlock,flags);
         if (on)
-                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+                info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         else
-                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
         usc_set_serial_signals(info);
         spin_unlock_irqrestore(&info->irq_spinlock,flags);
 }
@@ -6239,8 +6239,8 @@ static void usc_get_serial_signals( struct mgsl_struct *info )
 {
         u16 status;
 
-        /* clear all serial signals except DTR and RTS */
-        info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
+        /* clear all serial signals except RTS and DTR */
+        info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
 
         /* Read the Misc Interrupt status Register (MISR) to get */
         /* the V24 status signals. */
@@ -6265,7 +6265,7 @@ static void usc_get_serial_signals( struct mgsl_struct *info )
 
 /* usc_set_serial_signals()
  *
- *      Set the state of DTR and RTS based on contents of
+ *      Set the state of RTS and DTR based on contents of
  *      serial_signals member of device extension.
  *      
  * Arguments:           info    pointer to device instance data
@@ -7779,8 +7779,8 @@ static int hdlcdev_open(struct net_device *dev)
                 return rc;
         }
 
-        /* assert DTR and RTS, apply hardware settings */
-        info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        /* assert RTS and DTR, apply hardware settings */
+        info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         mgsl_program_hw(info);
 
         /* enable network layer transmit */
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index ac8599a76820..aa9eece35c3b 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -785,7 +785,7 @@ static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
         /* Handle transition to B0 status */
         if (old_termios->c_cflag & CBAUD &&
             !(tty->termios.c_cflag & CBAUD)) {
-                info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 spin_lock_irqsave(&info->lock,flags);
                 set_signals(info);
                 spin_unlock_irqrestore(&info->lock,flags);
@@ -1560,8 +1560,8 @@ static int hdlcdev_open(struct net_device *dev)
                 return rc;
         }
 
-        /* assert DTR and RTS, apply hardware settings */
-        info->signals |= SerialSignal_RTS + SerialSignal_DTR;
+        /* assert RTS and DTR, apply hardware settings */
+        info->signals |= SerialSignal_RTS | SerialSignal_DTR;
         program_hw(info);
 
         /* enable network layer transmit */
@@ -2488,7 +2488,7 @@ static void shutdown(struct slgt_info *info)
         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
 
         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
-                info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 set_signals(info);
         }
 
@@ -2548,12 +2548,12 @@ static void change_params(struct slgt_info *info)
 
         cflag = info->port.tty->termios.c_cflag;
 
-        /* if B0 rate (hangup) specified then negate DTR and RTS */
-        /* otherwise assert DTR and RTS */
+        /* if B0 rate (hangup) specified then negate RTS and DTR */
+        /* otherwise assert RTS and DTR */
         if (cflag & CBAUD)
-                info->signals |= SerialSignal_RTS + SerialSignal_DTR;
+                info->signals |= SerialSignal_RTS | SerialSignal_DTR;
         else
-                info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
 
         /* byte size and parity */
 
@@ -3256,9 +3256,9 @@ static void dtr_rts(struct tty_port *port, int on)
 
         spin_lock_irqsave(&info->lock,flags);
         if (on)
-                info->signals |= SerialSignal_RTS + SerialSignal_DTR;
+                info->signals |= SerialSignal_RTS | SerialSignal_DTR;
         else
-                info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
         set_signals(info);
         spin_unlock_irqrestore(&info->lock,flags);
 }
@@ -4119,7 +4119,7 @@ static void reset_port(struct slgt_info *info)
         tx_stop(info);
         rx_stop(info);
 
-        info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+        info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
         set_signals(info);
 
         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
@@ -4546,8 +4546,8 @@ static void get_signals(struct slgt_info *info)
 {
         unsigned short status = rd_reg16(info, SSR);
 
-        /* clear all serial signals except DTR and RTS */
-        info->signals &= SerialSignal_DTR + SerialSignal_RTS;
+        /* clear all serial signals except RTS and DTR */
+        info->signals &= SerialSignal_RTS | SerialSignal_DTR;
 
         if (status & BIT3)
                 info->signals |= SerialSignal_DSR;
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index 545402509cab..6d5780cf1d57 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -882,7 +882,7 @@ static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
         /* Handle transition to B0 status */
         if (old_termios->c_cflag & CBAUD &&
             !(tty->termios.c_cflag & CBAUD)) {
-                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 spin_lock_irqsave(&info->lock,flags);
                 set_signals(info);
                 spin_unlock_irqrestore(&info->lock,flags);
@@ -1676,8 +1676,8 @@ static int hdlcdev_open(struct net_device *dev)
                 return rc;
         }
 
-        /* assert DTR and RTS, apply hardware settings */
-        info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        /* assert RTS and DTR, apply hardware settings */
+        info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         program_hw(info);
 
         /* enable network layer transmit */
@@ -2706,7 +2706,7 @@ static void shutdown(SLMP_INFO * info)
         reset_port(info);
 
         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
-                info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 set_signals(info);
         }
 
@@ -2768,12 +2768,12 @@ static void change_params(SLMP_INFO *info)
 
         cflag = info->port.tty->termios.c_cflag;
 
-        /* if B0 rate (hangup) specified then negate DTR and RTS */
-        /* otherwise assert DTR and RTS */
+        /* if B0 rate (hangup) specified then negate RTS and DTR */
+        /* otherwise assert RTS and DTR */
         if (cflag & CBAUD)
-                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+                info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         else
-                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
 
         /* byte size and parity */
 
@@ -3212,12 +3212,12 @@ static int tiocmget(struct tty_struct *tty)
         get_signals(info);
         spin_unlock_irqrestore(&info->lock,flags);
 
-        result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
-                ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
-                ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
-                ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
-                ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
-                ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
+        result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
+                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
+                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
+                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG : 0) |
+                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
+                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
 
         if (debug_level >= DEBUG_LEVEL_INFO)
                 printk("%s(%d):%s tiocmget() value=%08X\n",
@@ -3272,9 +3272,9 @@ static void dtr_rts(struct tty_port *port, int on)
 
         spin_lock_irqsave(&info->lock,flags);
         if (on)
-                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+                info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
         else
-                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
         set_signals(info);
         spin_unlock_irqrestore(&info->lock,flags);
 }
@@ -4354,7 +4354,7 @@ static void reset_port(SLMP_INFO *info)
                 tx_stop(info);
                 rx_stop(info);
 
-                info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
                 set_signals(info);
 
                 /* disable all port interrupts */
@@ -4750,8 +4750,8 @@ static void get_signals(SLMP_INFO *info)
         u16 gpstatus = read_status_reg(info);
         u16 testbit;
 
-        /* clear all serial signals except DTR and RTS */
-        info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
+        /* clear all serial signals except RTS and DTR */
+        info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
 
         /* set serial signal bits to reflect MISR */
 
@@ -4770,7 +4770,7 @@ static void get_signals(SLMP_INFO *info)
                 info->serial_signals |= SerialSignal_DSR;
 }
 
-/* Set the state of DTR and RTS based on contents of
+/* Set the state of RTS and DTR based on contents of
  * serial_signals member of device context.
  */
 static void set_signals(SLMP_INFO *info)