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serial: fix device name reporting when minor space is shared between drivers 

The multiple drivers share the minor space occupied by a particular major
number, the actual index within the device name's space is indicated by
the tty_driver->name_base + uart_port->line

Another usable formula is (uart_driver->minor - MINOR_BASE) + port->line

Use those to print the device names properly in such situations in
serial_core.c and 8250.c

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David S. Miller 2008-10-13 10:45:26 +01:00 committed by Linus Torvalds
parent a7be18d436
commit 8440838bc5
2 changed files with 20 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/serial/8250.c
View File

@ -57,6 +57,13 @@ static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;
static struct uart_driver serial8250_reg;
static int serial_index(struct uart_port *port)
{
return (serial8250_reg.minor - 64) + port->line;
}
/*
* Debugging.
*/
@ -997,7 +1004,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
return;
DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04x, 0x%p): ",
up->port.line, up->port.iobase, up->port.membase);
serial_index(&up->port), up->port.iobase, up->port.membase);
/*
* We really do need global IRQs disabled here - we're going to
@ -1132,8 +1139,8 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
if (up->capabilities != uart_config[up->port.type].flags) {
printk(KERN_WARNING
"ttyS%d: detected caps %08x should be %08x\n",
up->port.line, up->capabilities,
uart_config[up->port.type].flags);
serial_index(&up->port), up->capabilities,
uart_config[up->port.type].flags);
}
up->port.fifosize = uart_config[up->port.type].fifo_size;
@ -1857,7 +1864,8 @@ static int serial8250_startup(struct uart_port *port)
*/
if (!(up->port.flags & UPF_BUGGY_UART) &&
(serial_inp(up, UART_LSR) == 0xff)) {
printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
printk(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
serial_index(&up->port));
return -ENODEV;
}
@ -1912,7 +1920,8 @@ static int serial8250_startup(struct uart_port *port)
*/
if (!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) {
up->bugs |= UART_BUG_THRE;
pr_debug("ttyS%d - using backup timer\n", port->line);
pr_debug("ttyS%d - using backup timer\n",
serial_index(port));
}
}
@ -1972,7 +1981,7 @@ static int serial8250_startup(struct uart_port *port)
if (!(up->bugs & UART_BUG_TXEN)) {
up->bugs |= UART_BUG_TXEN;
pr_debug("ttyS%d - enabling bad tx status workarounds\n",
port->line);
serial_index(port));
}
} else {
up->bugs &= ~UART_BUG_TXEN;
@ -2633,7 +2642,6 @@ static int serial8250_console_early_setup(void)
return serial8250_find_port_for_earlycon();
}
static struct uart_driver serial8250_reg;
static struct console serial8250_console = {
.name = "ttyS",
.write = serial8250_console_write,

7
drivers/serial/serial_core.c
View File

@ -2051,7 +2051,8 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *port)
"transmitter\n",
port->dev ? port->dev->bus_id : "",
port->dev ? ": " : "",
drv->dev_name, port->line);
drv->dev_name,
drv->tty_driver->name_base + port->line);
ops->shutdown(port);
}
@ -2176,7 +2177,9 @@ uart_report_port(struct uart_driver *drv, struct uart_port *port)
printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n",
port->dev ? port->dev->bus_id : "",
port->dev ? ": " : "",
drv->dev_name, port->line, address, port->irq, uart_type(port));
drv->dev_name,
drv->tty_driver->name_base + port->line,
address, port->irq, uart_type(port));
}
static void