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TTY: synclink: Convert + to | for bit operations

浏览代码 
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>
这个提交包含在：
Joe Perches
2013-01-27 18:21:00 -08:00
提交者 Greg Kroah-Hartman
父节点 abd7bacae6
当前提交 9fe8074b82
共修改 4 个文件，包含 59 行新增和 59 行删除
下载 Patch 文件 下载 Diff 文件 展开所有文件 折叠所有文件

26
drivers/char/pcmcia/synclink_cs.c
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@@ -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);