[PATCH] staging: most: Remove unused mutex from most_video_dev

[PATCH] staging: most: Remove unused mutex from most_video_dev

[Ravi Kumar kairi]

From: Ravi Kumar Kairi <kumarkairiravi@gmail.com>

The `lock` field in struct most_video_dev is never used anywhere in
the codebase. Since it serves no purpose, remove it to clean up the
structure.

Signed-off-by: Ravi Kumar Kairi <kumarkairiravi@gmail.com>
---
 drivers/staging/most/video/video.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/staging/most/video/video.c b/drivers/staging/most/video/video.c
index 2b3cdb1ce1..bd51125698 100644
--- a/drivers/staging/most/video/video.c
+++ b/drivers/staging/most/video/video.c
@@ -40,8 +40,6 @@ struct most_video_dev {
 	struct video_device *vdev;
 	unsigned int ctrl_input;
 
-	struct mutex lock;
-
 	wait_queue_head_t wait_data;
 };
 
-- 
2.48.1

[PATCH] Cleanup of most_video_dev structure

[Ravi Kumar kairi]

From: Ravi Kumar Kairi <kumarkairiravi@gmail.com>

This patch series removes unused synchronization primitives from
struct most_video_dev.

Ravi Kumar Kairi (2):
  staging: most: Remove unused mutex from most_video_dev
  staging: most: Remove unused spinlock from most_video_dev

 drivers/staging/most/video/video.c | 3 ---
 1 file changed, 3 deletions(-)

-- 
2.48.1

[PATCH] staging: most: Remove unused mutex from most_video_dev

[Ravi Kumar kairi]

From: Ravi Kumar Kairi <kumarkairiravi@gmail.com>

The `lock` field in struct most_video_dev is never used anywhere in
the codebase. Since it serves no purpose, remove it to clean up the
structure.

Signed-off-by: Ravi Kumar Kairi <kumarkairiravi@gmail.com>
---
 drivers/staging/most/video/video.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/staging/most/video/video.c b/drivers/staging/most/video/video.c
index 2b3cdb1ce1..bd51125698 100644
--- a/drivers/staging/most/video/video.c
+++ b/drivers/staging/most/video/video.c
@@ -40,8 +40,6 @@ struct most_video_dev {
 	struct video_device *vdev;
 	unsigned int ctrl_input;
 
-	struct mutex lock;
-
 	wait_queue_head_t wait_data;
 };
 
-- 
2.48.1

[PATCH] staging: most: Remove unused spinlock from most_video_dev

[Ravi Kumar kairi]

From: Ravi Kumar Kairi <kumarkairiravi@gmail.com>

The `list_lock` spinlock in struct most_video_dev is never used
anywhere in the codebase. Since it serves no purpose, remove it
to clean up the structure.

Signed-off-by: Ravi Kumar Kairi <kumarkairiravi@gmail.com>
---
 drivers/staging/most/video/video.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/staging/most/video/video.c b/drivers/staging/most/video/video.c
index bd51125698..83b46476ca 100644
--- a/drivers/staging/most/video/video.c
+++ b/drivers/staging/most/video/video.c
@@ -33,7 +33,6 @@ struct most_video_dev {
 	bool mute;
 
 	struct list_head pending_mbos;
-	spinlock_t list_lock;
 
 	struct v4l2_device v4l2_dev;
 	atomic_t access_ref;
-- 
2.48.1

Re: [PATCH] Cleanup of most_video_dev structure

[Greg KH]

On Fri, Feb 21, 2025 at 10:04:24PM +0530, Ravi Kumar kairi wrote:
> From: Ravi Kumar Kairi <kumarkairiravi@gmail.com>
> 
> This patch series removes unused synchronization primitives from
> struct most_video_dev.
> 
> Ravi Kumar Kairi (2):
>   staging: most: Remove unused mutex from most_video_dev
>   staging: most: Remove unused spinlock from most_video_dev
> 
>  drivers/staging/most/video/video.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> -- 
> 2.48.1
> 

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:

- This looks like a new version of a previously submitted patch, but you
  did not list below the --- line any changes from the previous version.
  Please read the section entitled "The canonical patch format" in the
  kernel file, Documentation/process/submitting-patches.rst for what
  needs to be done here to properly describe this.

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] staging: most: Remove unused spinlock from most_video_dev

[kernel test robot]

Hi Ravi,

kernel test robot noticed the following build errors:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/intel-lab-lkp/linux/commits/Ravi-Kumar-kairi/staging-most-Remove-unused-spinlock-from-most_video_dev/20250222-004552
base:   staging/staging-testing
patch link:    https://lore.kernel.org/r/20250221163444.57492-3-kumarkairiravi%40gmail.com
patch subject: [PATCH] staging: most: Remove unused spinlock from most_video_dev
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20250303/202503031028.7ZRlzYcI-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250303/202503031028.7ZRlzYcI-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503031028.7ZRlzYcI-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/staging/most/video/video.c:130:23: error: no member named 'list_lock' in 'struct most_video_dev'
     130 |         spin_lock_irq(&mdev->list_lock);
         |                        ~~~~  ^
   drivers/staging/most/video/video.c:134:26: error: no member named 'list_lock' in 'struct most_video_dev'
     134 |                 spin_unlock_irq(&mdev->list_lock);
         |                                  ~~~~  ^
   drivers/staging/most/video/video.c:136:24: error: no member named 'list_lock' in 'struct most_video_dev'
     136 |                 spin_lock_irq(&mdev->list_lock);
         |                                ~~~~  ^
   drivers/staging/most/video/video.c:138:25: error: no member named 'list_lock' in 'struct most_video_dev'
     138 |         spin_unlock_irq(&mdev->list_lock);
         |                          ~~~~  ^
   drivers/staging/most/video/video.c:191:25: error: no member named 'list_lock' in 'struct most_video_dev'
     191 |                         spin_lock_irq(&mdev->list_lock);
         |                                        ~~~~  ^
   drivers/staging/most/video/video.c:193:27: error: no member named 'list_lock' in 'struct most_video_dev'
     193 |                         spin_unlock_irq(&mdev->list_lock);
         |                                          ~~~~  ^
   drivers/staging/most/video/video.c:392:27: error: no member named 'list_lock' in 'struct most_video_dev'
     392 |         spin_lock_irqsave(&mdev->list_lock, flags);
         |                            ~~~~  ^
   include/linux/spinlock.h:381:39: note: expanded from macro 'spin_lock_irqsave'
     381 |         raw_spin_lock_irqsave(spinlock_check(lock), flags);     \
         |                                              ^~~~
   include/linux/spinlock.h:244:34: note: expanded from macro 'raw_spin_lock_irqsave'
     244 |                 flags = _raw_spin_lock_irqsave(lock);   \
         |                                                ^~~~
   drivers/staging/most/video/video.c:394:33: error: no member named 'list_lock' in 'struct most_video_dev'
     394 |                 spin_unlock_irqrestore(&mdev->list_lock, flags);
         |                                         ~~~~  ^
   drivers/staging/most/video/video.c:399:32: error: no member named 'list_lock' in 'struct most_video_dev'
     399 |         spin_unlock_irqrestore(&mdev->list_lock, flags);
         |                                 ~~~~  ^
   drivers/staging/most/video/video.c:477:24: error: no member named 'list_lock' in 'struct most_video_dev'
     477 |         spin_lock_init(&mdev->list_lock);
         |                         ~~~~  ^
   include/linux/spinlock.h:335:38: note: expanded from macro 'spin_lock_init'
     335 |         __raw_spin_lock_init(spinlock_check(lock),              \
         |                                             ^~~~
   10 errors generated.


vim +130 drivers/staging/most/video/video.c

3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  114  
1b10a0316e2d5e drivers/staging/most/video/video.c    Christian Gromm 2017-11-21  115  static int comp_vdev_close(struct file *filp)
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  116  {
1b10a0316e2d5e drivers/staging/most/video/video.c    Christian Gromm 2017-11-21  117  	struct comp_fh *fh = filp->private_data;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  118  	struct most_video_dev *mdev = fh->mdev;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  119  	struct mbo *mbo, *tmp;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  120  
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  121  	/*
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  122  	 * We need to put MBOs back before we call most_stop_channel()
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  123  	 * to deallocate MBOs.
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  124  	 * From the other hand mostcore still calling rx_completion()
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  125  	 * to deliver MBOs until most_stop_channel() is called.
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  126  	 * Use mute to work around this issue.
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  127  	 * This must be implemented in core.
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  128  	 */
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  129  
e494df039df0fc drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06 @130  	spin_lock_irq(&mdev->list_lock);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  131  	mdev->mute = true;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  132  	list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  133  		list_del(&mbo->list);
e494df039df0fc drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  134  		spin_unlock_irq(&mdev->list_lock);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  135  		most_put_mbo(mbo);
e494df039df0fc drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  136  		spin_lock_irq(&mdev->list_lock);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  137  	}
e494df039df0fc drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  138  	spin_unlock_irq(&mdev->list_lock);
1b10a0316e2d5e drivers/staging/most/video/video.c    Christian Gromm 2017-11-21  139  	most_stop_channel(mdev->iface, mdev->ch_idx, &comp);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  140  	mdev->mute = false;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  141  
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  142  	v4l2_fh_del(&fh->fh);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  143  	v4l2_fh_exit(&fh->fh);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  144  
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  145  	atomic_dec(&mdev->access_ref);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  146  	kfree(fh);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  147  	return 0;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  148  }
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  149  

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https://github.com/intel/lkp-tests/wiki

Re: [PATCH] staging: most: Remove unused mutex from most_video_dev

[kernel test robot]

Hi Ravi,

kernel test robot noticed the following build errors:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/intel-lab-lkp/linux/commits/Ravi-Kumar-kairi/staging-most-Remove-unused-mutex-from-most_video_dev/20250222-004322
base:   staging/staging-testing
patch link:    https://lore.kernel.org/r/20250221163444.57492-2-kumarkairiravi%40gmail.com
patch subject: [PATCH] staging: most: Remove unused mutex from most_video_dev
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20250303/202503031448.eqB11EdG-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250303/202503031448.eqB11EdG-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503031448.eqB11EdG-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/staging/most/video/video.c:417:28: error: no member named 'lock' in 'struct most_video_dev'
     417 |         mdev->vdev->lock = &mdev->lock;
         |                             ~~~~  ^
   drivers/staging/most/video/video.c:474:20: error: no member named 'lock' in 'struct most_video_dev'
     474 |         mutex_init(&mdev->lock);
         |                     ~~~~  ^
   include/linux/mutex.h:64:16: note: expanded from macro 'mutex_init'
      64 |         __mutex_init((mutex), #mutex, &__key);                          \
         |                       ^~~~~
   2 errors generated.


vim +417 drivers/staging/most/video/video.c

3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  402  
1b10a0316e2d5e drivers/staging/most/video/video.c    Christian Gromm 2017-11-21  403  static int comp_register_videodev(struct most_video_dev *mdev)
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  404  {
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  405  	int ret;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  406  
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  407  	init_waitqueue_head(&mdev->wait_data);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  408  
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  409  	/* allocate and fill v4l2 video struct */
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  410  	mdev->vdev = video_device_alloc();
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  411  	if (!mdev->vdev)
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  412  		return -ENOMEM;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  413  
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  414  	/* Fill the video capture device struct */
1b10a0316e2d5e drivers/staging/most/video/video.c    Christian Gromm 2017-11-21  415  	*mdev->vdev = comp_videodev_template;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  416  	mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24 @417  	mdev->vdev->lock = &mdev->lock;
323977d5d33a8d drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  418  	snprintf(mdev->vdev->name, sizeof(mdev->vdev->name), "MOST: %s",
323977d5d33a8d drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  419  		 mdev->v4l2_dev.name);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  420  
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  421  	/* Register the v4l2 device */
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  422  	video_set_drvdata(mdev->vdev, mdev);
e653614ee1832c drivers/staging/most/video/video.c    Hans Verkuil    2020-02-03  423  	ret = video_register_device(mdev->vdev, VFL_TYPE_VIDEO, -1);
b23e8e51e6dc40 drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  424  	if (ret) {
8f6f9ed15d679a drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  425  		v4l2_err(&mdev->v4l2_dev, "video_register_device failed (%d)\n",
b23e8e51e6dc40 drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  426  			 ret);
eab231c0398a91 drivers/staging/most/aim-v4l2/video.c Christian Gromm 2016-06-06  427  		video_device_release(mdev->vdev);
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  428  	}
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  429  
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  430  	return ret;
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  431  }
3d31c0cb6c127b drivers/staging/most/aim-v4l2/video.c Christian Gromm 2015-07-24  432  

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