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Date: Sun, 6 Jun 2010 16:10:21 -0700
From: mark gross <640e9920@...il.com>
To: James Bottomley <James.Bottomley@...e.de>
Cc: pm list <linux-pm@...ts.linux-foundation.org>,
markgross@...gnar.org, netdev@...r.kernel.org,
alsa-devel@...a-project.org, Takashi Iwai <tiwai@...e.de>,
Jaroslav Kysela <perex@...ex.cz>
Subject: Re: [RFC] pm_qos: get rid of the allocation in pm_qos_add_request()
On Sat, Jun 05, 2010 at 02:20:14PM -0500, James Bottomley wrote:
> [alsa-devel says it's a moderated list, so feel free to drop before
> replying]
>
> Since every caller has to squirrel away the returned pointer anyway,
> they might as well supply the memory area. This fixes a bug in a few of
> the call sites where the returned pointer was dereferenced without
> checking it for NULL (which gets returned if the kzalloc failed).
>
> I'd like to hear how sound and netdev feels about this: it will add
> about two more pointers worth of data to struct netdev and struct
> snd_pcm_substream .. but I think it's worth it. If you're OK, I'll add
> your acks and send through the pm tree.
>
> This also looks to me like an android independent clean up (even though
> it renders the request_add atomically callable). I also added include
> guards to include/linux/pm_qos_params.h
>
> James
>
> ---
>
> drivers/net/e1000e/netdev.c | 17 ++++------
> drivers/net/igbvf/netdev.c | 9 ++---
> drivers/net/wireless/ipw2x00/ipw2100.c | 12 +++---
> include/linux/netdevice.h | 2 +-
> include/linux/pm_qos_params.h | 12 +++++--
> include/sound/pcm.h | 2 +-
> kernel/pm_qos_params.c | 55 ++++++++++++++++---------------
> sound/core/pcm_native.c | 12 ++-----
> 8 files changed, 60 insertions(+), 61 deletions(-)
>
> diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
> index 24507f3..47ea62f 100644
> --- a/drivers/net/e1000e/netdev.c
> +++ b/drivers/net/e1000e/netdev.c
> @@ -2901,10 +2901,10 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
> * dropped transactions.
> */
> pm_qos_update_request(
> - adapter->netdev->pm_qos_req, 55);
> + &adapter->netdev->pm_qos_req, 55);
> } else {
> pm_qos_update_request(
> - adapter->netdev->pm_qos_req,
> + &adapter->netdev->pm_qos_req,
> PM_QOS_DEFAULT_VALUE);
> }
> }
> @@ -3196,9 +3196,9 @@ int e1000e_up(struct e1000_adapter *adapter)
>
> /* DMA latency requirement to workaround early-receive/jumbo issue */
> if (adapter->flags & FLAG_HAS_ERT)
> - adapter->netdev->pm_qos_req =
> - pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
> - PM_QOS_DEFAULT_VALUE);
> + pm_qos_add_request(&adapter->netdev->pm_qos_req,
> + PM_QOS_CPU_DMA_LATENCY,
> + PM_QOS_DEFAULT_VALUE);
>
> /* hardware has been reset, we need to reload some things */
> e1000_configure(adapter);
> @@ -3263,11 +3263,8 @@ void e1000e_down(struct e1000_adapter *adapter)
> e1000_clean_tx_ring(adapter);
> e1000_clean_rx_ring(adapter);
>
> - if (adapter->flags & FLAG_HAS_ERT) {
> - pm_qos_remove_request(
> - adapter->netdev->pm_qos_req);
> - adapter->netdev->pm_qos_req = NULL;
> - }
> + if (adapter->flags & FLAG_HAS_ERT)
> + pm_qos_remove_request(&adapter->netdev->pm_qos_req);
>
> /*
> * TODO: for power management, we could drop the link and
> diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
> index 5e2b2a8..5da569f 100644
> --- a/drivers/net/igbvf/netdev.c
> +++ b/drivers/net/igbvf/netdev.c
> @@ -48,7 +48,7 @@
> #define DRV_VERSION "1.0.0-k0"
> char igbvf_driver_name[] = "igbvf";
> const char igbvf_driver_version[] = DRV_VERSION;
> -struct pm_qos_request_list *igbvf_driver_pm_qos_req;
> +struct pm_qos_request_list igbvf_driver_pm_qos_req;
> static const char igbvf_driver_string[] =
> "Intel(R) Virtual Function Network Driver";
> static const char igbvf_copyright[] = "Copyright (c) 2009 Intel Corporation.";
> @@ -2902,8 +2902,8 @@ static int __init igbvf_init_module(void)
> printk(KERN_INFO "%s\n", igbvf_copyright);
>
> ret = pci_register_driver(&igbvf_driver);
> - igbvf_driver_pm_qos_req = pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
> - PM_QOS_DEFAULT_VALUE);
> + pm_qos_add_request(igbvf_driver_pm_qos_req, PM_QOS_CPU_DMA_LATENCY,
should be:
+ pm_qos_add_request(&igbvf_driver_pm_qos_req, PM_QOS_CPU_DMA_LATENCY,
--mgross
> + PM_QOS_DEFAULT_VALUE);
>
> return ret;
> }
> @@ -2918,8 +2918,7 @@ module_init(igbvf_init_module);
> static void __exit igbvf_exit_module(void)
> {
> pci_unregister_driver(&igbvf_driver);
> - pm_qos_remove_request(igbvf_driver_pm_qos_req);
> - igbvf_driver_pm_qos_req = NULL;
> + pm_qos_remove_request(&igbvf_driver_pm_qos_req);
> }
> module_exit(igbvf_exit_module);
>
> diff --git a/drivers/net/wireless/ipw2x00/ipw2100.c b/drivers/net/wireless/ipw2x00/ipw2100.c
> index 0bd4dfa..7f0d98b 100644
> --- a/drivers/net/wireless/ipw2x00/ipw2100.c
> +++ b/drivers/net/wireless/ipw2x00/ipw2100.c
> @@ -174,7 +174,7 @@ that only one external action is invoked at a time.
> #define DRV_DESCRIPTION "Intel(R) PRO/Wireless 2100 Network Driver"
> #define DRV_COPYRIGHT "Copyright(c) 2003-2006 Intel Corporation"
>
> -struct pm_qos_request_list *ipw2100_pm_qos_req;
> +struct pm_qos_request_list ipw2100_pm_qos_req;
>
> /* Debugging stuff */
> #ifdef CONFIG_IPW2100_DEBUG
> @@ -1741,7 +1741,7 @@ static int ipw2100_up(struct ipw2100_priv *priv, int deferred)
> /* the ipw2100 hardware really doesn't want power management delays
> * longer than 175usec
> */
> - pm_qos_update_request(ipw2100_pm_qos_req, 175);
> + pm_qos_update_request(&ipw2100_pm_qos_req, 175);
>
> /* If the interrupt is enabled, turn it off... */
> spin_lock_irqsave(&priv->low_lock, flags);
> @@ -1889,7 +1889,7 @@ static void ipw2100_down(struct ipw2100_priv *priv)
> ipw2100_disable_interrupts(priv);
> spin_unlock_irqrestore(&priv->low_lock, flags);
>
> - pm_qos_update_request(ipw2100_pm_qos_req, PM_QOS_DEFAULT_VALUE);
> + pm_qos_update_request(&ipw2100_pm_qos_req, PM_QOS_DEFAULT_VALUE);
>
> /* We have to signal any supplicant if we are disassociating */
> if (associated)
> @@ -6669,8 +6669,8 @@ static int __init ipw2100_init(void)
> if (ret)
> goto out;
>
> - ipw2100_pm_qos_req = pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
> - PM_QOS_DEFAULT_VALUE);
> + pm_qos_add_request(&ipw2100_pm_qos_req, PM_QOS_CPU_DMA_LATENCY,
> + PM_QOS_DEFAULT_VALUE);
> #ifdef CONFIG_IPW2100_DEBUG
> ipw2100_debug_level = debug;
> ret = driver_create_file(&ipw2100_pci_driver.driver,
> @@ -6692,7 +6692,7 @@ static void __exit ipw2100_exit(void)
> &driver_attr_debug_level);
> #endif
> pci_unregister_driver(&ipw2100_pci_driver);
> - pm_qos_remove_request(ipw2100_pm_qos_req);
> + pm_qos_remove_request(&ipw2100_pm_qos_req);
> }
>
> module_init(ipw2100_init);
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 40291f3..393555a 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -779,7 +779,7 @@ struct net_device {
> */
> char name[IFNAMSIZ];
>
> - struct pm_qos_request_list *pm_qos_req;
> + struct pm_qos_request_list pm_qos_req;
>
> /* device name hash chain */
> struct hlist_node name_hlist;
> diff --git a/include/linux/pm_qos_params.h b/include/linux/pm_qos_params.h
> index 8ba440e..d823cc0 100644
> --- a/include/linux/pm_qos_params.h
> +++ b/include/linux/pm_qos_params.h
> @@ -1,8 +1,10 @@
> +#ifndef _LINUX_PM_QOS_PARAMS_H
> +#define _LINUX_PM_QOS_PARAMS_H
> /* interface for the pm_qos_power infrastructure of the linux kernel.
> *
> * Mark Gross <mgross@...ux.intel.com>
> */
> -#include <linux/list.h>
> +#include <linux/plist.h>
> #include <linux/notifier.h>
> #include <linux/miscdevice.h>
>
> @@ -14,9 +16,12 @@
> #define PM_QOS_NUM_CLASSES 4
> #define PM_QOS_DEFAULT_VALUE -1
>
> -struct pm_qos_request_list;
> +struct pm_qos_request_list {
> + struct plist_node list;
> + int pm_qos_class;
> +};
>
> -struct pm_qos_request_list *pm_qos_add_request(int pm_qos_class, s32 value);
> +void pm_qos_add_request(struct pm_qos_request_list *l, int pm_qos_class, s32 value);
> void pm_qos_update_request(struct pm_qos_request_list *pm_qos_req,
> s32 new_value);
> void pm_qos_remove_request(struct pm_qos_request_list *pm_qos_req);
> @@ -25,3 +30,4 @@ int pm_qos_request(int pm_qos_class);
> int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
> int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
>
> +#endif
> diff --git a/include/sound/pcm.h b/include/sound/pcm.h
> index dd76cde..6e3a297 100644
> --- a/include/sound/pcm.h
> +++ b/include/sound/pcm.h
> @@ -366,7 +366,7 @@ struct snd_pcm_substream {
> int number;
> char name[32]; /* substream name */
> int stream; /* stream (direction) */
> - struct pm_qos_request_list *latency_pm_qos_req; /* pm_qos request */
> + struct pm_qos_request_list latency_pm_qos_req; /* pm_qos request */
> size_t buffer_bytes_max; /* limit ring buffer size */
> struct snd_dma_buffer dma_buffer;
> unsigned int dma_buf_id;
> diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
> index 241fa79..f1d3d23 100644
> --- a/kernel/pm_qos_params.c
> +++ b/kernel/pm_qos_params.c
> @@ -30,7 +30,6 @@
> /*#define DEBUG*/
>
> #include <linux/pm_qos_params.h>
> -#include <linux/plist.h>
> #include <linux/sched.h>
> #include <linux/spinlock.h>
> #include <linux/slab.h>
> @@ -49,11 +48,6 @@
> * or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock
> * held, taken with _irqsave. One lock to rule them all
> */
> -struct pm_qos_request_list {
> - struct plist_node list;
> - int pm_qos_class;
> -};
> -
> enum pm_qos_type {
> PM_QOS_MAX, /* return the largest value */
> PM_QOS_MIN, /* return the smallest value */
> @@ -195,6 +189,11 @@ int pm_qos_request(int pm_qos_class)
> }
> EXPORT_SYMBOL_GPL(pm_qos_request);
>
> +static int pm_qos_request_active(struct pm_qos_request_list *req)
> +{
> + return req->pm_qos_class != 0;
> +}
> +
> /**
> * pm_qos_add_request - inserts new qos request into the list
> * @pm_qos_class: identifies which list of qos request to us
> @@ -206,25 +205,22 @@ EXPORT_SYMBOL_GPL(pm_qos_request);
> * element as a handle for use in updating and removal. Call needs to save
> * this handle for later use.
> */
> -struct pm_qos_request_list *pm_qos_add_request(int pm_qos_class, s32 value)
> +void pm_qos_add_request(struct pm_qos_request_list *dep,
> + int pm_qos_class, s32 value)
> {
> - struct pm_qos_request_list *dep;
> -
> - dep = kzalloc(sizeof(struct pm_qos_request_list), GFP_KERNEL);
> - if (dep) {
> - struct pm_qos_object *o = pm_qos_array[pm_qos_class];
> - int new_value;
> -
> - if (value == PM_QOS_DEFAULT_VALUE)
> - new_value = o->default_value;
> - else
> - new_value = value;
> - plist_node_init(&dep->list, new_value);
> - dep->pm_qos_class = pm_qos_class;
> - update_target(o, &dep->list, 0);
> - }
> + struct pm_qos_object *o = pm_qos_array[pm_qos_class];
> + int new_value;
> +
> + if (pm_qos_request_active(dep))
> + return;
>
> - return dep;
> + if (value == PM_QOS_DEFAULT_VALUE)
> + new_value = o->default_value;
> + else
> + new_value = value;
> + plist_node_init(&dep->list, new_value);
> + dep->pm_qos_class = pm_qos_class;
> + update_target(o, &dep->list, 0);
> }
> EXPORT_SYMBOL_GPL(pm_qos_add_request);
>
> @@ -286,7 +282,7 @@ void pm_qos_remove_request(struct pm_qos_request_list *pm_qos_req)
>
> o = pm_qos_array[pm_qos_req->pm_qos_class];
> update_target(o, &pm_qos_req->list, 1);
> - kfree(pm_qos_req);
> + memset(pm_qos_req, 0, sizeof(*pm_qos_req));
> }
> EXPORT_SYMBOL_GPL(pm_qos_remove_request);
>
> @@ -334,8 +330,12 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
>
> pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
> if (pm_qos_class >= 0) {
> - filp->private_data = (void *) pm_qos_add_request(pm_qos_class,
> - PM_QOS_DEFAULT_VALUE);
> + struct pm_qos_request_list *req = kzalloc(GFP_KERNEL, sizeof(*req));
> + if (!req)
> + return -ENOMEM;
> +
> + pm_qos_add_request(req, pm_qos_class, PM_QOS_DEFAULT_VALUE);
> + filp->private_data = req;
>
> if (filp->private_data)
> return 0;
> @@ -347,8 +347,9 @@ static int pm_qos_power_release(struct inode *inode, struct file *filp)
> {
> struct pm_qos_request_list *req;
>
> - req = (struct pm_qos_request_list *)filp->private_data;
> + req = filp->private_data;
> pm_qos_remove_request(req);
> + kfree(req);
>
> return 0;
> }
> diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
> index 303ac04..d3b8b51 100644
> --- a/sound/core/pcm_native.c
> +++ b/sound/core/pcm_native.c
> @@ -451,13 +451,10 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
> snd_pcm_timer_resolution_change(substream);
> runtime->status->state = SNDRV_PCM_STATE_SETUP;
>
> - if (substream->latency_pm_qos_req) {
> - pm_qos_remove_request(substream->latency_pm_qos_req);
> - substream->latency_pm_qos_req = NULL;
> - }
> + pm_qos_remove_request(&substream->latency_pm_qos_req);
> if ((usecs = period_to_usecs(runtime)) >= 0)
> - substream->latency_pm_qos_req = pm_qos_add_request(
> - PM_QOS_CPU_DMA_LATENCY, usecs);
> + pm_qos_add_request(&substream->latency_pm_qos_req,
> + PM_QOS_CPU_DMA_LATENCY, usecs);
> return 0;
> _error:
> /* hardware might be unuseable from this time,
> @@ -512,8 +509,7 @@ static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
> if (substream->ops->hw_free)
> result = substream->ops->hw_free(substream);
> runtime->status->state = SNDRV_PCM_STATE_OPEN;
> - pm_qos_remove_request(substream->latency_pm_qos_req);
> - substream->latency_pm_qos_req = NULL;
> + pm_qos_remove_request(&substream->latency_pm_qos_req);
> return result;
> }
>
>
>
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