[PATCH] hso: fix debug routines

[PATCH] hso: fix debug routines

[Antti Kaijanmäki]

On Mon, 2009-10-26 at 12:40 -0700, Greg KH wrote:
> Yes, that should be a new patch, especially as it would not be needed
> to fix older kernels for the original bug.
> 
> So, care to send 2 patches?  The debug one isn't needed to be sent to
> the stable@kernel.org address.


Signed-off-by: Antti Kaijanmäki <antti.kaijanmaki@nomovok.com>
---
 drivers/net/usb/hso.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index fa4e581..746839b 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -378,7 +378,7 @@ static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
 }
 
 #define DUMP(buf_, len_)	\
-	dbg_dump(__LINE__, __func__, buf_, len_)
+	dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
 
 #define DUMP1(buf_, len_)			\
 	do {					\
@@ -1527,7 +1527,7 @@ static void tiocmget_intr_callback(struct urb *urb)
 		dev_warn(&usb->dev,
 			 "hso received invalid serial state notification\n");
 		DUMP(serial_state_notification,
-		     sizeof(hso_serial_state_notifation))
+		     sizeof(struct hso_serial_state_notification));
 	} else {
 
 		UART_state_bitmap = le16_to_cpu(serial_state_notification->
-- 
1.6.3.3

[PATCH] hso: fix soft-lockup

[Antti Kaijanmäki]

On Mon, 2009-10-26 at 12:40 -0700, Greg KH wrote:
> Yes, that should be a new patch, especially as it would not be needed
> to fix older kernels for the original bug.
> 
> So, care to send 2 patches?  The debug one isn't needed to be sent to
> the stable@kernel.org address.


Fix soft-lockup in hso.c which is triggered on SMP machine when
modem is removed while file descriptor(s) under /dev are still open:

  old version called kref_put() too early which resulted in destroying
  hso_serial and hso_device objects which were still used later on.

Signed-off-by: Antti Kaijanmäki <antti.kaijanmaki@nomovok.com>
---
 drivers/net/usb/hso.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 746839b..43bc3fc 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -1363,7 +1363,7 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)
 	/* reset the rts and dtr */
 	/* do the actual close */
 	serial->open_count--;
-	kref_put(&serial->parent->ref, hso_serial_ref_free);
+
 	if (serial->open_count <= 0) {
 		serial->open_count = 0;
 		spin_lock_irq(&serial->serial_lock);
@@ -1383,6 +1383,8 @@ static void hso_serial_close(struct tty_struct *tty, struct file *filp)
 		usb_autopm_put_interface(serial->parent->interface);
 
 	mutex_unlock(&serial->parent->mutex);
+
+	kref_put(&serial->parent->ref, hso_serial_ref_free);
 }
 
 /* close the requested serial port */
-- 
1.6.3.3

Re: [PATCH] hso: fix debug routines

[Andrew Morton]

On Tue, 27 Oct 2009 16:26:55 +0200
Antti Kaijanmäki <antti.kaijanmaki@nomovok.com> wrote:

> On Mon, 2009-10-26 at 12:40 -0700, Greg KH wrote:
> > Yes, that should be a new patch, especially as it would not be needed
> > to fix older kernels for the original bug.
> > 
> > So, care to send 2 patches?  The debug one isn't needed to be sent to
> > the stable@kernel.org address.
> 
> 
> Signed-off-by: Antti Kaijanmäki <antti.kaijanmaki@nomovok.com>
> ---
>  drivers/net/usb/hso.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
> index fa4e581..746839b 100644
> --- a/drivers/net/usb/hso.c
> +++ b/drivers/net/usb/hso.c
> @@ -378,7 +378,7 @@ static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
>  }
>  
>  #define DUMP(buf_, len_)	\
> -	dbg_dump(__LINE__, __func__, buf_, len_)
> +	dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
>  
>  #define DUMP1(buf_, len_)			\
>  	do {					\
> @@ -1527,7 +1527,7 @@ static void tiocmget_intr_callback(struct urb *urb)
>  		dev_warn(&usb->dev,
>  			 "hso received invalid serial state notification\n");
>  		DUMP(serial_state_notification,
> -		     sizeof(hso_serial_state_notifation))
> +		     sizeof(struct hso_serial_state_notification));
>  	} else {
>  
>  		UART_state_bitmap = le16_to_cpu(serial_state_notification->

This patch has no changelog, and I'm not seeing any description of what
it fixes and how it fixes it up-thread.

Re: [PATCH] hso: fix debug routines

[Antti Kaijanmäki]

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On Wed, 2009-10-28 at 16:16 -0700, Andrew Morton wrote:
> This patch has no changelog, and I'm not seeing any description of what
> it fixes and how it fixes it up-thread.

The patch fixes debug routines of the hso driver. Debug has to be
enabled manually with a #define so this patch has 0 impact by default.

Broken down from original patch:
http://bugzilla.kernel.org/show_bug.cgi?id=14469
http://lkml.org/lkml/2009/10/22/37


 -- Antti



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