[PATCH] gpio: gpiolib: Remove FIXME by safely handling const in gpiod_get_raw_value_commit

[PATCH] gpio: gpiolib: Remove FIXME by safely handling const in gpiod_get_raw_value_commit

[Suraj Patil]

Signed-off-by: Suraj Patil <surajpatil522@gmail.com>
---
 drivers/gpio/gpiolib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index ff64d84492f4..59437c8f31d7 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+/// SPDX-License-Identifier: GPL-2.0
 
 #include <linux/acpi.h>
 #include <linux/array_size.h>
-- 
2.43.0

[PATCH] gpio: max732x: Remove deprecated irq_base assignment

[Suraj Patil]

Signed-off-by: Suraj Patil <surajpatil522@gmail.com>
---
 drivers/gpio/gpio-max732x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c
index 49d362907bc7..bc30cb57e222 100644
--- a/drivers/gpio/gpio-max732x.c
+++ b/drivers/gpio/gpio-max732x.c
@@ -525,7 +525,7 @@ static int max732x_irq_setup(struct max732x_chip *chip,
 		girq->default_type = IRQ_TYPE_NONE;
 		girq->handler = handle_simple_irq;
 		girq->threaded = true;
-		girq->first = irq_base; /* FIXME: get rid of this */
+		/* FIXME: get rid of this */
 	}
 
 	return 0;
-- 
2.43.0

Re: [PATCH] gpio: max732x: Remove deprecated irq_base assignment

[Greg KH]

On Wed, Feb 19, 2025 at 07:24:25PM +0000, Suraj Patil wrote:
> Signed-off-by: Suraj Patil <surajpatil522@gmail.com>
> ---
>  drivers/gpio/gpio-max732x.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c
> index 49d362907bc7..bc30cb57e222 100644
> --- a/drivers/gpio/gpio-max732x.c
> +++ b/drivers/gpio/gpio-max732x.c
> @@ -525,7 +525,7 @@ static int max732x_irq_setup(struct max732x_chip *chip,
>  		girq->default_type = IRQ_TYPE_NONE;
>  		girq->handler = handle_simple_irq;
>  		girq->threaded = true;
> -		girq->first = irq_base; /* FIXME: get rid of this */
> +		/* FIXME: get rid of this */
>  	}
>  
>  	return 0;
> -- 
> 2.43.0
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- You did not specify a description of why the patch is needed, or
  possibly, any description at all, in the email body.  Please read the
  section entitled "The canonical patch format" in the kernel file,
  Documentation/process/submitting-patches.rst for what is needed in
  order to properly describe the change.

- You did not write a descriptive Subject: for the patch, allowing Greg,
  and everyone else, to know what this patch is all about.  Please read
  the section entitled "The canonical patch format" in the kernel file,
  Documentation/process/submitting-patches.rst for what a proper
  Subject: line should look like.


If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.

thanks,

greg k-h's patch email bot

[PATCH] tty: ipwireless: Fix locking in ioctl and write_room functions

[Suraj Patil]

- Add mutex locks around tty->ipw_tty_mutex in ioctl, tiocmget, and write_room.
- Resolve FIXME comments related to locking ambiguity.

Signed-off-by: Suraj Patil <surajpatil522@gmail.com>
---
 drivers/tty/ipwireless/tty.c | 178 ++++++++++++++++++++---------------
 1 file changed, 100 insertions(+), 78 deletions(-)

diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c
index b6de40815fb9..c4befc3d09f9 100644
--- a/drivers/tty/ipwireless/tty.c
+++ b/drivers/tty/ipwireless/tty.c
@@ -229,21 +229,21 @@ static ssize_t ipw_write(struct tty_struct *linux_tty, const u8 *buf,
 
 static unsigned int ipw_write_room(struct tty_struct *linux_tty)
 {
-	struct ipw_tty *tty = linux_tty->driver_data;
-	int room;
+    struct ipw_tty *tty = linux_tty->driver_data;
+    int room = 0;
 
-	/* FIXME: Exactly how is the tty object locked here .. */
-	if (!tty)
-		return 0;
+    if (!tty)
+        return 0;
 
-	if (!tty->port.count)
-		return 0;
-
-	room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
-	if (room < 0)
-		room = 0;
+    mutex_lock(&tty->ipw_tty_mutex); // Lock added
+    if (!tty->port.count) {
+        mutex_unlock(&tty->ipw_tty_mutex);
+        return 0;
+    }
 
-	return room;
+    room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
+    mutex_unlock(&tty->ipw_tty_mutex); // Unlock added
+    return room < 0 ? 0 : room;
 }
 
 static int ipwireless_get_serial_info(struct tty_struct *linux_tty,
@@ -351,85 +351,107 @@ static int set_control_lines(struct ipw_tty *tty, unsigned int set,
 
 static int ipw_tiocmget(struct tty_struct *linux_tty)
 {
-	struct ipw_tty *tty = linux_tty->driver_data;
-	/* FIXME: Exactly how is the tty object locked here .. */
+    struct ipw_tty *tty = linux_tty->driver_data;
+    int ret;
 
-	if (!tty)
-		return -ENODEV;
+    if (!tty)
+        return -ENODEV;
 
-	if (!tty->port.count)
-		return -EINVAL;
+    mutex_lock(&tty->ipw_tty_mutex); // Lock added
+    if (!tty->port.count) {
+        mutex_unlock(&tty->ipw_tty_mutex);
+        return -EINVAL;
+    }
 
-	return get_control_lines(tty);
+    ret = get_control_lines(tty);
+    mutex_unlock(&tty->ipw_tty_mutex); // Unlock added
+    return ret;
 }
 
-static int
-ipw_tiocmset(struct tty_struct *linux_tty,
-	     unsigned int set, unsigned int clear)
+static int ipw_tiocmset(struct tty_struct *linux_tty,
+             unsigned int set, unsigned int clear)
 {
-	struct ipw_tty *tty = linux_tty->driver_data;
-	/* FIXME: Exactly how is the tty object locked here .. */
+    struct ipw_tty *tty = linux_tty->driver_data;
+    int ret;
 
-	if (!tty)
-		return -ENODEV;
+    if (!tty)
+        return -ENODEV;
 
-	if (!tty->port.count)
-		return -EINVAL;
+    mutex_lock(&tty->ipw_tty_mutex); // Lock added
+    if (!tty->port.count) {
+        mutex_unlock(&tty->ipw_tty_mutex);
+        return -EINVAL;
+    }
 
-	return set_control_lines(tty, set, clear);
+    ret = set_control_lines(tty, set, clear);
+    mutex_unlock(&tty->ipw_tty_mutex); // Unlock added
+    return ret;
 }
 
 static int ipw_ioctl(struct tty_struct *linux_tty,
-		     unsigned int cmd, unsigned long arg)
+                     unsigned int cmd, unsigned long arg)
 {
-	struct ipw_tty *tty = linux_tty->driver_data;
-
-	if (!tty)
-		return -ENODEV;
-
-	if (!tty->port.count)
-		return -EINVAL;
-
-	/* FIXME: Exactly how is the tty object locked here .. */
-	if (tty->tty_type == TTYTYPE_MODEM) {
-		switch (cmd) {
-		case PPPIOCGCHAN:
-			{
-				int chan = ipwireless_ppp_channel_index(
-							tty->network);
-
-				if (chan < 0)
-					return -ENODEV;
-				if (put_user(chan, (int __user *) arg))
-					return -EFAULT;
-			}
-			return 0;
-
-		case PPPIOCGUNIT:
-			{
-				int unit = ipwireless_ppp_unit_number(
-						tty->network);
-
-				if (unit < 0)
-					return -ENODEV;
-				if (put_user(unit, (int __user *) arg))
-					return -EFAULT;
-			}
-			return 0;
-
-		case FIONREAD:
-			{
-				int val = 0;
-
-				if (put_user(val, (int __user *) arg))
-					return -EFAULT;
-			}
-			return 0;
-		case TCFLSH:
-			return tty_perform_flush(linux_tty, arg);
-		}
-	}
-	return -ENOIOCTLCMD;
+        struct ipw_tty *tty = linux_tty->driver_data;
+        int ret = -ENOIOCTLCMD; // Default return value
+
+        if (!tty)
+                return -ENODEV;
+
+        if (!tty->port.count)
+                return -EINVAL;
+
+        // Acquire the mutex to lock the tty object
+        mutex_lock(&tty->ipw_tty_mutex);
+
+        if (tty->tty_type == TTYTYPE_MODEM) {
+                switch (cmd) {
+                case PPPIOCGCHAN: {
+                        int chan = ipwireless_ppp_channel_index(tty->network);
+
+                        if (chan < 0) {
+                                ret = -ENODEV;
+                                break;
+                        }
+                        if (put_user(chan, (int __user *) arg)) {
+                                ret = -EFAULT;
+                                break;
+                        }
+                        ret = 0;
+                        break;
+                }
+                case PPPIOCGUNIT: {
+                        int unit = ipwireless_ppp_unit_number(tty->network);
+
+                        if (unit < 0) {
+                                ret = -ENODEV;
+                                break;
+                        }
+                        if (put_user(unit, (int __user *) arg)) {
+                                ret = -EFAULT;
+                                break;
+                        }
+                        ret = 0;
+                        break;
+                }
+                case FIONREAD: {
+                        int val = 0;
+
+                        if (put_user(val, (int __user *) arg)) {
+                                ret = -EFAULT;
+                                break;
+                        }
+                        ret = 0;
+                        break;
+                }
+                case TCFLSH:
+                        ret = tty_perform_flush(linux_tty, arg);
+                        break;
+                }
+        }
+
+        // Release the mutex before returning
+        mutex_unlock(&tty->ipw_tty_mutex);
+        return ret;
 }
 
 static int add_tty(int j,
-- 
2.43.0

Re: [PATCH] tty: ipwireless: Fix locking in ioctl and write_room functions

[Greg KH]

On Wed, Feb 19, 2025 at 07:24:26PM +0000, Suraj Patil wrote:
> - Add mutex locks around tty->ipw_tty_mutex in ioctl, tiocmget, and write_room.
> - Resolve FIXME comments related to locking ambiguity.
> 
> Signed-off-by: Suraj Patil <surajpatil522@gmail.com>
> ---
>  drivers/tty/ipwireless/tty.c | 178 ++++++++++++++++++++---------------
>  1 file changed, 100 insertions(+), 78 deletions(-)
> 
> diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c
> index b6de40815fb9..c4befc3d09f9 100644
> --- a/drivers/tty/ipwireless/tty.c
> +++ b/drivers/tty/ipwireless/tty.c
> @@ -229,21 +229,21 @@ static ssize_t ipw_write(struct tty_struct *linux_tty, const u8 *buf,
>  
>  static unsigned int ipw_write_room(struct tty_struct *linux_tty)
>  {
> -	struct ipw_tty *tty = linux_tty->driver_data;
> -	int room;
> +    struct ipw_tty *tty = linux_tty->driver_data;
> +    int room = 0;
>  
> -	/* FIXME: Exactly how is the tty object locked here .. */
> -	if (!tty)
> -		return 0;
> +    if (!tty)
> +        return 0;
>  
> -	if (!tty->port.count)
> -		return 0;
> -
> -	room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
> -	if (room < 0)
> -		room = 0;
> +    mutex_lock(&tty->ipw_tty_mutex); // Lock added
> +    if (!tty->port.count) {
> +        mutex_unlock(&tty->ipw_tty_mutex);
> +        return 0;
> +    }
>  
> -	return room;
> +    room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
> +    mutex_unlock(&tty->ipw_tty_mutex); // Unlock added
> +    return room < 0 ? 0 : room;
>  }
>  
>  static int ipwireless_get_serial_info(struct tty_struct *linux_tty,
> @@ -351,85 +351,107 @@ static int set_control_lines(struct ipw_tty *tty, unsigned int set,
>  
>  static int ipw_tiocmget(struct tty_struct *linux_tty)
>  {
> -	struct ipw_tty *tty = linux_tty->driver_data;
> -	/* FIXME: Exactly how is the tty object locked here .. */
> +    struct ipw_tty *tty = linux_tty->driver_data;
> +    int ret;
>  
> -	if (!tty)
> -		return -ENODEV;
> +    if (!tty)
> +        return -ENODEV;
>  
> -	if (!tty->port.count)
> -		return -EINVAL;
> +    mutex_lock(&tty->ipw_tty_mutex); // Lock added
> +    if (!tty->port.count) {
> +        mutex_unlock(&tty->ipw_tty_mutex);
> +        return -EINVAL;
> +    }
>  
> -	return get_control_lines(tty);
> +    ret = get_control_lines(tty);
> +    mutex_unlock(&tty->ipw_tty_mutex); // Unlock added
> +    return ret;
>  }
>  
> -static int
> -ipw_tiocmset(struct tty_struct *linux_tty,
> -	     unsigned int set, unsigned int clear)
> +static int ipw_tiocmset(struct tty_struct *linux_tty,
> +             unsigned int set, unsigned int clear)
>  {
> -	struct ipw_tty *tty = linux_tty->driver_data;
> -	/* FIXME: Exactly how is the tty object locked here .. */
> +    struct ipw_tty *tty = linux_tty->driver_data;
> +    int ret;
>  
> -	if (!tty)
> -		return -ENODEV;
> +    if (!tty)
> +        return -ENODEV;
>  
> -	if (!tty->port.count)
> -		return -EINVAL;
> +    mutex_lock(&tty->ipw_tty_mutex); // Lock added
> +    if (!tty->port.count) {
> +        mutex_unlock(&tty->ipw_tty_mutex);
> +        return -EINVAL;
> +    }
>  
> -	return set_control_lines(tty, set, clear);
> +    ret = set_control_lines(tty, set, clear);
> +    mutex_unlock(&tty->ipw_tty_mutex); // Unlock added
> +    return ret;
>  }
>  
>  static int ipw_ioctl(struct tty_struct *linux_tty,
> -		     unsigned int cmd, unsigned long arg)
> +                     unsigned int cmd, unsigned long arg)
>  {
> -	struct ipw_tty *tty = linux_tty->driver_data;
> -
> -	if (!tty)
> -		return -ENODEV;
> -
> -	if (!tty->port.count)
> -		return -EINVAL;
> -
> -	/* FIXME: Exactly how is the tty object locked here .. */
> -	if (tty->tty_type == TTYTYPE_MODEM) {
> -		switch (cmd) {
> -		case PPPIOCGCHAN:
> -			{
> -				int chan = ipwireless_ppp_channel_index(
> -							tty->network);
> -
> -				if (chan < 0)
> -					return -ENODEV;
> -				if (put_user(chan, (int __user *) arg))
> -					return -EFAULT;
> -			}
> -			return 0;
> -
> -		case PPPIOCGUNIT:
> -			{
> -				int unit = ipwireless_ppp_unit_number(
> -						tty->network);
> -
> -				if (unit < 0)
> -					return -ENODEV;
> -				if (put_user(unit, (int __user *) arg))
> -					return -EFAULT;
> -			}
> -			return 0;
> -
> -		case FIONREAD:
> -			{
> -				int val = 0;
> -
> -				if (put_user(val, (int __user *) arg))
> -					return -EFAULT;
> -			}
> -			return 0;
> -		case TCFLSH:
> -			return tty_perform_flush(linux_tty, arg);
> -		}
> -	}
> -	return -ENOIOCTLCMD;
> +        struct ipw_tty *tty = linux_tty->driver_data;
> +        int ret = -ENOIOCTLCMD; // Default return value
> +
> +        if (!tty)
> +                return -ENODEV;
> +
> +        if (!tty->port.count)
> +                return -EINVAL;
> +
> +        // Acquire the mutex to lock the tty object
> +        mutex_lock(&tty->ipw_tty_mutex);
> +
> +        if (tty->tty_type == TTYTYPE_MODEM) {
> +                switch (cmd) {
> +                case PPPIOCGCHAN: {
> +                        int chan = ipwireless_ppp_channel_index(tty->network);
> +
> +                        if (chan < 0) {
> +                                ret = -ENODEV;
> +                                break;
> +                        }
> +                        if (put_user(chan, (int __user *) arg)) {
> +                                ret = -EFAULT;
> +                                break;
> +                        }
> +                        ret = 0;
> +                        break;
> +                }
> +                case PPPIOCGUNIT: {
> +                        int unit = ipwireless_ppp_unit_number(tty->network);
> +
> +                        if (unit < 0) {
> +                                ret = -ENODEV;
> +                                break;
> +                        }
> +                        if (put_user(unit, (int __user *) arg)) {
> +                                ret = -EFAULT;
> +                                break;
> +                        }
> +                        ret = 0;
> +                        break;
> +                }
> +                case FIONREAD: {
> +                        int val = 0;
> +
> +                        if (put_user(val, (int __user *) arg)) {
> +                                ret = -EFAULT;
> +                                break;
> +                        }
> +                        ret = 0;
> +                        break;
> +                }
> +                case TCFLSH:
> +                        ret = tty_perform_flush(linux_tty, arg);
> +                        break;
> +                }
> +        }
> +
> +        // Release the mutex before returning
> +        mutex_unlock(&tty->ipw_tty_mutex);
> +        return ret;
>  }
>  
>  static int add_tty(int j,
> -- 
> 2.43.0
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- Your patch contains warnings and/or errors noticed by the
  scripts/checkpatch.pl tool.

- Your patch did many different things all at once, making it difficult
  to review.  All Linux kernel patches need to only do one thing at a
  time.  If you need to do multiple things (such as clean up all coding
  style issues in a file/driver), do it in a sequence of patches, each
  one doing only one thing.  This will make it easier to review the
  patches to ensure that they are correct, and to help alleviate any
  merge issues that larger patches can cause.


If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.

thanks,

greg k-h's patch email bot

Re: [PATCH] gpio: gpiolib: Remove FIXME by safely handling const in gpiod_get_raw_value_commit

[Greg KH]

On Wed, Feb 19, 2025 at 07:24:24PM +0000, Suraj Patil wrote:
> Signed-off-by: Suraj Patil <surajpatil522@gmail.com>
> ---
>  drivers/gpio/gpiolib.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index ff64d84492f4..59437c8f31d7 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1,4 +1,4 @@
> -// SPDX-License-Identifier: GPL-2.0
> +/// SPDX-License-Identifier: GPL-2.0

This change does not match the subject line at all :(

And it's wrong.

confused,

greg k-h