[PATCH 1/2] serial: bfin_5xx: add missing spin_lock init

[PATCH 1/2] serial: bfin_5xx: add missing spin_lock init

[Mike Frysinger]

The Blackfin serial driver never initialized the spin_lock that is part of
the serial core structure, but we never noticed because spin_lock's are
rarely enabled on UP systems.  Yeah lockdep and friends.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 drivers/serial/bfin_5xx.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index e2f6b1b..d7fcca1 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -1110,6 +1110,7 @@ static void __init bfin_serial_init_ports(void)
 	bfin_serial_hw_init();
 
 	for (i = 0; i < nr_active_ports; i++) {
+		spin_lock_init(&bfin_serial_ports[i].port.lock);
 		bfin_serial_ports[i].port.uartclk   = get_sclk();
 		bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
 		bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
-- 
1.6.3.1

[PATCH 2/2] serial: bfin_5xx: fix building as module when early printk is enabled

[Mike Frysinger]

Since early printk only makes sense/works when the serial driver is built
into the kernel, disable the option for this driver when it is going to be
built as a module.  Otherwise we get build failures due to the ifdef
handling.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 drivers/serial/bfin_5xx.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index d7fcca1..b4a7650 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -38,6 +38,10 @@
 #include <asm/cacheflush.h>
 #endif
 
+#ifdef CONFIG_SERIAL_BFIN_MODULE
+# undef CONFIG_EARLY_PRINTK
+#endif
+
 /* UART name and device definitions */
 #define BFIN_SERIAL_NAME	"ttyBF"
 #define BFIN_SERIAL_MAJOR	204
-- 
1.6.3.1

Re: [PATCH 2/2] serial: bfin_5xx: fix building as module when early printk is enabled

[Andrew Morton]

On Fri, 12 Jun 2009 20:48:13 -0400
Mike Frysinger <vapier@gentoo.org> wrote:

> Since early printk only makes sense/works when the serial driver is built
> into the kernel, disable the option for this driver when it is going to be
> built as a module.  Otherwise we get build failures due to the ifdef
> handling.
> 
> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
> ---
>  drivers/serial/bfin_5xx.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
> index d7fcca1..b4a7650 100644
> --- a/drivers/serial/bfin_5xx.c
> +++ b/drivers/serial/bfin_5xx.c
> @@ -38,6 +38,10 @@
>  #include <asm/cacheflush.h>
>  #endif
>  
> +#ifdef CONFIG_SERIAL_BFIN_MODULE
> +# undef CONFIG_EARLY_PRINTK
> +#endif
> +
>  /* UART name and device definitions */
>  #define BFIN_SERIAL_NAME	"ttyBF"
>  #define BFIN_SERIAL_MAJOR	204

And that _does_ look like -stable material.

Alan, I queued both these as to-be-merged-by-you.  So if you want me to
stfu and merge them, please let me know.

Re: [PATCH 1/2] serial: bfin_5xx: add missing spin_lock init

[Andrew Morton]

On Fri, 12 Jun 2009 20:48:12 -0400
Mike Frysinger <vapier@gentoo.org> wrote:

> The Blackfin serial driver never initialized the spin_lock that is part of
> the serial core structure, but we never noticed because spin_lock's are
> rarely enabled on UP systems.  Yeah lockdep and friends.
> 

I'm sitting here wondering if we need this in -stable, but the changlog
failed to provide sufficient information to determine this.

>  drivers/serial/bfin_5xx.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
> index e2f6b1b..d7fcca1 100644
> --- a/drivers/serial/bfin_5xx.c
> +++ b/drivers/serial/bfin_5xx.c
> @@ -1110,6 +1110,7 @@ static void __init bfin_serial_init_ports(void)
>  	bfin_serial_hw_init();
>  
>  	for (i = 0; i < nr_active_ports; i++) {
> +		spin_lock_init(&bfin_serial_ports[i].port.lock);
>  		bfin_serial_ports[i].port.uartclk   = get_sclk();
>  		bfin_serial_ports[i].port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
>  		bfin_serial_ports[i].port.ops       = &bfin_serial_pops;

It _should_ be possible to do this initialisation at compile-time.  But
I expect it would be hard and/or ugly.