linux-kernel - Re: [PATCH] use mutex instead of semaphore in EDAC core

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Message-ID: <20070425183836.5115.qmail@web50109.mail.re2.yahoo.com>
Date:	Wed, 25 Apr 2007 11:38:36 -0700 (PDT)
From:	Doug Thompson <norsk5@...oo.com>
To:	Matthias Kaehlcke <matthias.kaehlcke@...il.com>,
	norsk5@...ssion.com, bluesmoke-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] use mutex instead of semaphore in EDAC core

Thanks, I will have to modify this, as the edac_mc.c has been
re-written in a patch I have in my queue, but not net pushed up stream.
I will generate a new quilt patch with your named acknowledged.

thanks

doug thompson


--- Matthias Kaehlcke <matthias.kaehlcke@...il.com> wrote:

> the EDAC core code uses a semaphore as mutex. use the mutex API
> instead of the (binary) semaphore
> 
> Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@...il.com>
> 
> --
> diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> index 7b62230..f217750 100644
> --- a/drivers/edac/edac_mc.c
> +++ b/drivers/edac/edac_mc.c
> @@ -50,7 +50,7 @@ static int panic_on_ue;
>  static int poll_msec = 1000;
>  
>  /* lock to memory controller's control array */
> -static DECLARE_MUTEX(mem_ctls_mutex);
> +static DEFINE_MUTEX(mem_ctls_mutex);
>  static struct list_head mc_devices = LIST_HEAD_INIT(mc_devices);
>  
>  static struct task_struct *edac_thread;
> @@ -1489,7 +1489,7 @@ int edac_mc_add_mc(struct mem_ctl_info *mci,
> int mc_idx)
>  		}
>  	}
>  #endif
> -	down(&mem_ctls_mutex);
> +	mutex_lock(&mem_ctls_mutex);
>  
>  	if (add_mc_to_global_list(mci))
>  		goto fail0;
> @@ -1507,14 +1507,14 @@ int edac_mc_add_mc(struct mem_ctl_info *mci,
> int mc_idx)
>  	edac_mc_printk(mci, KERN_INFO, "Giving out device to %s %s: DEV
> %s\n",
>  		mci->mod_name, mci->ctl_name, dev_name(mci->dev));
>  
> -	up(&mem_ctls_mutex);
> +	mutex_unlock(&mem_ctls_mutex);
>  	return 0;
>  
>  fail1:
>  	del_mc_from_global_list(mci);
>  
>  fail0:
> -	up(&mem_ctls_mutex);
> +	mutex_unlock(&mem_ctls_mutex);
>  	return 1;
>  }
>  EXPORT_SYMBOL_GPL(edac_mc_add_mc);
> @@ -1531,16 +1531,16 @@ struct mem_ctl_info * edac_mc_del_mc(struct
> device *dev)
>  	struct mem_ctl_info *mci;
>  
>  	debugf0("MC: %s()\n", __func__);
> -	down(&mem_ctls_mutex);
> +	mutex_lock(&mem_ctls_mutex);
>  
>  	if ((mci = find_mci_by_dev(dev)) == NULL) {
> -		up(&mem_ctls_mutex);
> +		mutex_unlock(&mem_ctls_mutex);
>  		return NULL;
>  	}
>  
>  	edac_remove_sysfs_mci_device(mci);
>  	del_mc_from_global_list(mci);
> -	up(&mem_ctls_mutex);
> +	mutex_unlock(&mem_ctls_mutex);
>  	edac_printk(KERN_INFO, EDAC_MC,
>  		"Removed device %d for %s %s: DEV %s\n", mci->mc_idx,
>  		mci->mod_name, mci->ctl_name, dev_name(mci->dev));
> @@ -1877,7 +1877,7 @@ static inline void check_mc_devices(void)
>  	struct mem_ctl_info *mci;
>  
>  	debugf3("%s()\n", __func__);
> -	down(&mem_ctls_mutex);
> +	mutex_lock(&mem_ctls_mutex);
>  
>  	list_for_each(item, &mc_devices) {
>  		mci = list_entry(item, struct mem_ctl_info, link);
> @@ -1886,7 +1886,7 @@ static inline void check_mc_devices(void)
>  			mci->edac_check(mci);
>  	}
>  
> -	up(&mem_ctls_mutex);
> +	mutex_unlock(&mem_ctls_mutex);
>  }
>  
>  /*
>  
> -- 
> Matthias Kaehlcke
> Linux Application Developer
> Barcelona
> 
>                 Don't walk behind me, I may not lead
>              Don't walk in front of me, I may not follow
>                 Just walk beside me and be my friend
>                           (Albert Camus)
>                                                                 
> .''`.
>     using free software / Debian GNU/Linux | http://debian.org  : :' 
> :
>                                                                 `.
> `'`
> gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4                  `-
> 

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