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Date: Wed, 22 Aug 2012 16:36:26 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: greg@...ah.com, linux-serial@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [RF CPATCH] tty: Split the serial_core helpers for setserial into two
For the sysctl work we should I think do something like this. At that point the
sysctl helpers can get/set values via the existing driver interfaces
From: Alan Cox <alan@...ux.intel.com>
We want them split so that we can call them from setserial functionality
where we copy to/from user space and do the locking, but also from sysfs
where in future we'll want to came them within a sysfs context.
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
drivers/tty/serial/serial_core.c | 158 +++++++++++++++++++++-----------------
1 file changed, 87 insertions(+), 71 deletions(-)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 5b308c8..bb5f236 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -634,38 +634,44 @@ static void uart_unthrottle(struct tty_struct *tty)
uart_set_mctrl(port, TIOCM_RTS);
}
-static int uart_get_info(struct uart_state *state,
- struct serial_struct __user *retinfo)
+static void uart_get_info(struct tty_port *port,
+ struct uart_state *state,
+ struct serial_struct *retinfo)
{
struct uart_port *uport = state->uart_port;
- struct tty_port *port = &state->port;
- struct serial_struct tmp;
-
- memset(&tmp, 0, sizeof(tmp));
- /* Ensure the state we copy is consistent and no hardware changes
- occur as we go */
- mutex_lock(&port->mutex);
+ memset(retinfo, 0, sizeof(retinfo));
- tmp.type = uport->type;
- tmp.line = uport->line;
- tmp.port = uport->iobase;
+ retinfo->type = uport->type;
+ retinfo->line = uport->line;
+ retinfo->port = uport->iobase;
if (HIGH_BITS_OFFSET)
- tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET;
- tmp.irq = uport->irq;
- tmp.flags = uport->flags;
- tmp.xmit_fifo_size = uport->fifosize;
- tmp.baud_base = uport->uartclk / 16;
- tmp.close_delay = jiffies_to_msecs(port->close_delay) / 10;
- tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
+ retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET;
+ retinfo->irq = uport->irq;
+ retinfo->flags = uport->flags;
+ retinfo->xmit_fifo_size = uport->fifosize;
+ retinfo->baud_base = uport->uartclk / 16;
+ retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10;
+ retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
ASYNC_CLOSING_WAIT_NONE :
jiffies_to_msecs(port->closing_wait) / 10;
- tmp.custom_divisor = uport->custom_divisor;
- tmp.hub6 = uport->hub6;
- tmp.io_type = uport->iotype;
- tmp.iomem_reg_shift = uport->regshift;
- tmp.iomem_base = (void *)(unsigned long)uport->mapbase;
+ retinfo->custom_divisor = uport->custom_divisor;
+ retinfo->hub6 = uport->hub6;
+ retinfo->io_type = uport->iotype;
+ retinfo->iomem_reg_shift = uport->regshift;
+ retinfo->iomem_base = (void *)(unsigned long)uport->mapbase;
+}
+
+static int uart_get_info_user(struct uart_state *state,
+ struct serial_struct __user *retinfo)
+{
+ struct tty_port *port = &state->port;
+ struct serial_struct tmp;
+ /* Ensure the state we copy is consistent and no hardware changes
+ occur as we go */
+ mutex_lock(&port->mutex);
+ uart_get_info(port, state, &tmp);
mutex_unlock(&port->mutex);
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
@@ -673,42 +679,30 @@ static int uart_get_info(struct uart_state *state,
return 0;
}
-static int uart_set_info(struct tty_struct *tty, struct uart_state *state,
- struct serial_struct __user *newinfo)
+static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
+ struct uart_state *state,
+ struct serial_struct *new_info)
{
- struct serial_struct new_serial;
struct uart_port *uport = state->uart_port;
- struct tty_port *port = &state->port;
unsigned long new_port;
unsigned int change_irq, change_port, closing_wait;
unsigned int old_custom_divisor, close_delay;
upf_t old_flags, new_flags;
int retval = 0;
- if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
- return -EFAULT;
-
- new_port = new_serial.port;
+ new_port = new_info->port;
if (HIGH_BITS_OFFSET)
- new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
+ new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET;
- new_serial.irq = irq_canonicalize(new_serial.irq);
- close_delay = msecs_to_jiffies(new_serial.close_delay * 10);
- closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
+ new_info->irq = irq_canonicalize(new_info->irq);
+ close_delay = msecs_to_jiffies(new_info->close_delay * 10);
+ closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
ASYNC_CLOSING_WAIT_NONE :
- msecs_to_jiffies(new_serial.closing_wait * 10);
+ msecs_to_jiffies(new_info->closing_wait * 10);
- /*
- * This semaphore protects port->count. It is also
- * very useful to prevent opens. Also, take the
- * port configuration semaphore to make sure that a
- * module insertion/removal doesn't change anything
- * under us.
- */
- mutex_lock(&port->mutex);
change_irq = !(uport->flags & UPF_FIXED_PORT)
- && new_serial.irq != uport->irq;
+ && new_info->irq != uport->irq;
/*
* Since changing the 'type' of the port changes its resource
@@ -717,29 +711,29 @@ static int uart_set_info(struct tty_struct *tty, struct uart_state *state,
*/
change_port = !(uport->flags & UPF_FIXED_PORT)
&& (new_port != uport->iobase ||
- (unsigned long)new_serial.iomem_base != uport->mapbase ||
- new_serial.hub6 != uport->hub6 ||
- new_serial.io_type != uport->iotype ||
- new_serial.iomem_reg_shift != uport->regshift ||
- new_serial.type != uport->type);
+ (unsigned long)new_info->iomem_base != uport->mapbase ||
+ new_info->hub6 != uport->hub6 ||
+ new_info->io_type != uport->iotype ||
+ new_info->iomem_reg_shift != uport->regshift ||
+ new_info->type != uport->type);
old_flags = uport->flags;
- new_flags = new_serial.flags;
+ new_flags = new_info->flags;
old_custom_divisor = uport->custom_divisor;
if (!capable(CAP_SYS_ADMIN)) {
retval = -EPERM;
if (change_irq || change_port ||
- (new_serial.baud_base != uport->uartclk / 16) ||
+ (new_info->baud_base != uport->uartclk / 16) ||
(close_delay != port->close_delay) ||
(closing_wait != port->closing_wait) ||
- (new_serial.xmit_fifo_size &&
- new_serial.xmit_fifo_size != uport->fifosize) ||
+ (new_info->xmit_fifo_size &&
+ new_info->xmit_fifo_size != uport->fifosize) ||
(((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0))
goto exit;
uport->flags = ((uport->flags & ~UPF_USR_MASK) |
(new_flags & UPF_USR_MASK));
- uport->custom_divisor = new_serial.custom_divisor;
+ uport->custom_divisor = new_info->custom_divisor;
goto check_and_exit;
}
@@ -747,10 +741,10 @@ static int uart_set_info(struct tty_struct *tty, struct uart_state *state,
* Ask the low level driver to verify the settings.
*/
if (uport->ops->verify_port)
- retval = uport->ops->verify_port(uport, &new_serial);
+ retval = uport->ops->verify_port(uport, new_info);
- if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) ||
- (new_serial.baud_base < 9600))
+ if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) ||
+ (new_info->baud_base < 9600))
retval = -EINVAL;
if (retval)
@@ -790,11 +784,11 @@ static int uart_set_info(struct tty_struct *tty, struct uart_state *state,
uport->ops->release_port(uport);
uport->iobase = new_port;
- uport->type = new_serial.type;
- uport->hub6 = new_serial.hub6;
- uport->iotype = new_serial.io_type;
- uport->regshift = new_serial.iomem_reg_shift;
- uport->mapbase = (unsigned long)new_serial.iomem_base;
+ uport->type = new_info->type;
+ uport->hub6 = new_info->hub6;
+ uport->iotype = new_info->io_type;
+ uport->regshift = new_info->iomem_reg_shift;
+ uport->mapbase = (unsigned long)new_info->iomem_base;
/*
* Claim and map the new regions
@@ -835,16 +829,16 @@ static int uart_set_info(struct tty_struct *tty, struct uart_state *state,
}
if (change_irq)
- uport->irq = new_serial.irq;
+ uport->irq = new_info->irq;
if (!(uport->flags & UPF_FIXED_PORT))
- uport->uartclk = new_serial.baud_base * 16;
+ uport->uartclk = new_info->baud_base * 16;
uport->flags = (uport->flags & ~UPF_CHANGE_MASK) |
(new_flags & UPF_CHANGE_MASK);
- uport->custom_divisor = new_serial.custom_divisor;
+ uport->custom_divisor = new_info->custom_divisor;
port->close_delay = close_delay;
port->closing_wait = closing_wait;
- if (new_serial.xmit_fifo_size)
- uport->fifosize = new_serial.xmit_fifo_size;
+ if (new_info->xmit_fifo_size)
+ uport->fifosize = new_info->xmit_fifo_size;
if (port->tty)
port->tty->low_latency =
(uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
@@ -873,6 +867,28 @@ static int uart_set_info(struct tty_struct *tty, struct uart_state *state,
} else
retval = uart_startup(tty, state, 1);
exit:
+ return retval;
+}
+
+static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state,
+ struct serial_struct __user *newinfo)
+{
+ struct serial_struct new_serial;
+ struct tty_port *port = &state->port;
+ int retval;
+
+ if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
+ return -EFAULT;
+
+ /*
+ * This semaphore protects port->count. It is also
+ * very useful to prevent opens. Also, take the
+ * port configuration semaphore to make sure that a
+ * module insertion/removal doesn't change anything
+ * under us.
+ */
+ mutex_lock(&port->mutex);
+ retval = uart_set_info(tty, port, state, &new_serial);
mutex_unlock(&port->mutex);
return retval;
}
@@ -1115,11 +1131,11 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd,
*/
switch (cmd) {
case TIOCGSERIAL:
- ret = uart_get_info(state, uarg);
+ ret = uart_get_info_user(state, uarg);
break;
case TIOCSSERIAL:
- ret = uart_set_info(tty, state, uarg);
+ ret = uart_set_info_user(tty, state, uarg);
break;
case TIOCSERCONFIG:
--
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