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Message-ID: <2904218.ZgtLmH5Irc@ax5200p>
Date: Tue, 14 Aug 2012 19:24:59 +0200
From: Marc Dietrich <marvin24@....de>
To: Tejun Heo <tj@...nel.org>
Cc: linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
akpm@...ux-foundation.org, mingo@...hat.com,
lauro.venancio@...nbossa.org, jak@...-linux.org,
Stefan Richter <stefanr@...6.in-berlin.de>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Alasdair Kergon <agk@...hat.com>,
Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
Samuel Ortiz <sameo@...ux.intel.com>, Rob Clark <rob@...com>,
Christine Caulfield <ccaulfie@...hat.com>,
Steven Whitehouse <swhiteho@...hat.com>,
Christoph Hellwig <hch@...radead.org>,
Sage Weil <sage@...tank.com>
Subject: Re: [PATCH 6/6] workqueue: deprecate WQ_NON_REENTRANT
Hi Tejun,
On Monday 13 August 2012 18:49:46 Tejun Heo wrote:
> WQ_NON_REENTRANT is now spurious. Make alloc_workqueue() trigger
> WARN_ON() if the flag is specified and drop it from all in-kernel
> users.
>
> If you're cc'd and wondering what's going on: Now all workqueues are
> non-reentrant, so there's no reason to use WQ_NON_REENTRANT.
>
> Some of the conversions in this patch aren't trivial.
>
> * WQ_UNBOUND | WQ_NON_REENTRANT workqueues w/ max_active == 1 are
> converted to alloc_ordered_workqueue().
>
> * NFC was using a lot of WQ_UNBOUND | WQ_NON_REENTRANT |
> WQ_MEM_RECLAIM workqueues w/ max_active == 1. I converted them to
> alloc_ordered_workqueue() but can't understand why NFC would need
> the reclaim flag at all. I added comments above all such
> occurrences. If I'm missing something, please let me know;
> otherwise, please drop the flag. Better, please try to use
> system_wq instead.
>
> * drivers/staging/nvec doesn't seem to need its own workqueue.
> Converted to use system_wq and cancel work items on unload. Plesae
> scream if it's wrong.
the nvec driver had its own workqueue because we found that it reduced some
timimg induced protocol errors. I just tested your patch which uses the system
workqueue and I failed to reproduce these protocol errors under stress
testing, so I think it's ok.
Because this is a single patch affecting many drivers, is this going through
linux-next or some subsystem tree? Maybe it would have been better to split it
in one patch per driver. Otherwise ...
Acked-By: Marc Dietrich <marvin24@....de>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Stefan Richter <stefanr@...6.in-berlin.de>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Alasdair Kergon <agk@...hat.com>
> Cc: Lauro Ramos Venancio <lauro.venancio@...nbossa.org>
> Cc: Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Cc: Julian Andres Klode <jak@...-linux.org>
> Cc: Marc Dietrich <marvin24@....de>
> Cc: Rob Clark <rob@...com>
> Cc: Christine Caulfield <ccaulfie@...hat.com>
> Cc: Steven Whitehouse <swhiteho@...hat.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: Sage Weil <sage@...tank.com>
> ---
> Documentation/workqueue.txt | 14 ++------------
> drivers/firewire/core-transaction.c | 3 +--
> drivers/gpu/drm/i915/i915_dma.c | 6 ++----
> drivers/md/dm-crypt.c | 10 ++--------
> drivers/md/dm-kcopyd.c | 3 +--
> drivers/md/dm-raid1.c | 3 +--
> drivers/md/dm.c | 3 +--
> drivers/mmc/host/dw_mmc.c | 3 +--
> drivers/nfc/pn533.c | 5 ++---
> drivers/staging/nvec/nvec.c | 10 ++++------
> drivers/staging/nvec/nvec.h | 2 --
> drivers/staging/omapdrm/omap_drv.c | 3 +--
> fs/dlm/ast.c | 5 +----
> fs/gfs2/main.c | 2 +-
> fs/xfs/xfs_super.c | 2 +-
> kernel/workqueue.c | 3 +++
> net/ceph/messenger.c | 2 +-
> net/nfc/core.c | 6 +++---
> net/nfc/hci/core.c | 8 ++++----
> net/nfc/hci/shdlc.c | 4 ++--
> net/nfc/llcp/llcp.c | 18 ++++++------------
> 21 files changed, 40 insertions(+), 75 deletions(-)
>
> diff --git a/Documentation/workqueue.txt b/Documentation/workqueue.txt
> index a6ab4b6..1fb8813 100644
> --- a/Documentation/workqueue.txt
> +++ b/Documentation/workqueue.txt
> @@ -100,8 +100,8 @@ Subsystems and drivers can create and queue work items
> through special workqueue API functions as they see fit. They can influence
> some
> aspects of the way the work items are executed by setting flags on the
> workqueue they are putting the work item on. These flags include
> -things like CPU locality, reentrancy, concurrency limits, priority and
> -more. To get a detailed overview refer to the API description of
> +things like CPU locality, concurrency limits, priority and more. To
> +get a detailed overview refer to the API description of
> alloc_workqueue() below.
>
> When a work item is queued to a workqueue, the target gcwq and
> @@ -166,16 +166,6 @@ resources, scheduled and executed.
>
> @flags:
>
> - WQ_NON_REENTRANT
> -
> - By default, a wq guarantees non-reentrance only on the same
> - CPU. A work item may not be executed concurrently on the same
> - CPU by multiple workers but is allowed to be executed
> - concurrently on multiple CPUs. This flag makes sure
> - non-reentrance is enforced across all CPUs. Work items queued
> - to a non-reentrant wq are guaranteed to be executed by at most
> - one worker system-wide at any given time.
> -
> WQ_UNBOUND
>
> Work items queued to an unbound wq are served by a special
> diff --git a/drivers/firewire/core-transaction.c
> b/drivers/firewire/core-transaction.c index 87d6f2d..45acc0f 100644
> --- a/drivers/firewire/core-transaction.c
> +++ b/drivers/firewire/core-transaction.c
> @@ -1257,8 +1257,7 @@ static int __init fw_core_init(void)
> {
> int ret;
>
> - fw_workqueue = alloc_workqueue("firewire",
> - WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
> + fw_workqueue = alloc_workqueue("firewire", WQ_MEM_RECLAIM, 0);
> if (!fw_workqueue)
> return -ENOMEM;
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c
> b/drivers/gpu/drm/i915/i915_dma.c index 9cf7dfe..a55ca7a 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1536,11 +1536,9 @@ int i915_driver_load(struct drm_device *dev, unsigned
> long flags) *
> * All tasks on the workqueue are expected to acquire the dev mutex
> * so there is no point in running more than one instance of the
> - * workqueue at any time: max_active = 1 and NON_REENTRANT.
> + * workqueue at any time. Use an ordered one.
> */
> - dev_priv->wq = alloc_workqueue("i915",
> - WQ_UNBOUND | WQ_NON_REENTRANT,
> - 1);
> + dev_priv->wq = alloc_ordered_workqueue("i915", 0);
> if (dev_priv->wq == NULL) {
> DRM_ERROR("Failed to create our workqueue.\n");
> ret = -ENOMEM;
> diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
> index 664743d..a7472d6 100644
> --- a/drivers/md/dm-crypt.c
> +++ b/drivers/md/dm-crypt.c
> @@ -1674,20 +1674,14 @@ static int crypt_ctr(struct dm_target *ti, unsigned
> int argc, char **argv) }
>
> ret = -ENOMEM;
> - cc->io_queue = alloc_workqueue("kcryptd_io",
> - WQ_NON_REENTRANT|
> - WQ_MEM_RECLAIM,
> - 1);
> + cc->io_queue = alloc_workqueue("kcryptd_io", WQ_MEM_RECLAIM, 1);
> if (!cc->io_queue) {
> ti->error = "Couldn't create kcryptd io queue";
> goto bad;
> }
>
> cc->crypt_queue = alloc_workqueue("kcryptd",
> - WQ_NON_REENTRANT|
> - WQ_CPU_INTENSIVE|
> - WQ_MEM_RECLAIM,
> - 1);
> + WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM, 1);
> if (!cc->crypt_queue) {
> ti->error = "Couldn't create kcryptd queue";
> goto bad;
> diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
> index bed444c..7234f71 100644
> --- a/drivers/md/dm-kcopyd.c
> +++ b/drivers/md/dm-kcopyd.c
> @@ -704,8 +704,7 @@ struct dm_kcopyd_client *dm_kcopyd_client_create(void)
> goto bad_slab;
>
> INIT_WORK(&kc->kcopyd_work, do_work);
> - kc->kcopyd_wq = alloc_workqueue("kcopyd",
> - WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
> + kc->kcopyd_wq = alloc_workqueue("kcopyd", WQ_MEM_RECLAIM, 0);
> if (!kc->kcopyd_wq)
> goto bad_workqueue;
>
> diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
> index fd61f98..c282fc7 100644
> --- a/drivers/md/dm-raid1.c
> +++ b/drivers/md/dm-raid1.c
> @@ -1090,8 +1090,7 @@ static int mirror_ctr(struct dm_target *ti, unsigned
> int argc, char **argv) ti->num_discard_requests = 1;
> ti->discard_zeroes_data_unsupported = true;
>
> - ms->kmirrord_wq = alloc_workqueue("kmirrord",
> - WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
> + ms->kmirrord_wq = alloc_workqueue("kmirrord", WQ_MEM_RECLAIM, 0);
> if (!ms->kmirrord_wq) {
> DMERR("couldn't start kmirrord");
> r = -ENOMEM;
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 4e09b6f..7c5ef85 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1897,8 +1897,7 @@ static struct mapped_device *alloc_dev(int minor)
> add_disk(md->disk);
> format_dev_t(md->name, MKDEV(_major, minor));
>
> - md->wq = alloc_workqueue("kdmflush",
> - WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
> + md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0);
> if (!md->wq)
> goto bad_thread;
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 72dc3cd..119e441 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -2030,8 +2030,7 @@ int dw_mci_probe(struct dw_mci *host)
> mci_writel(host, CLKSRC, 0);
>
> tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
> - host->card_workqueue = alloc_workqueue("dw-mci-card",
> - WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
> + host->card_workqueue = alloc_workqueue("dw-mci-card", WQ_MEM_RECLAIM, 1);
> if (!host->card_workqueue)
> goto err_dmaunmap;
> INIT_WORK(&host->card_work, dw_mci_work_routine_card);
> diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
> index d606f52..7dadcb8 100644
> --- a/drivers/nfc/pn533.c
> +++ b/drivers/nfc/pn533.c
> @@ -2334,9 +2334,8 @@ static int pn533_probe(struct usb_interface
> *interface, INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
> INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
> INIT_WORK(&dev->poll_work, pn533_wq_poll);
> - dev->wq = alloc_workqueue("pn533",
> - WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
> - 1);
> + /* XXX tj - why does NFC need WQ_MEM_RECLAIM? */
> + dev->wq = alloc_ordered_workqueue("pn533", WQ_MEM_RECLAIM);
> if (dev->wq == NULL)
> goto error;
>
> diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
> index 695ea35..9c39d53 100644
> --- a/drivers/staging/nvec/nvec.c
> +++ b/drivers/staging/nvec/nvec.c
> @@ -264,7 +264,7 @@ int nvec_write_async(struct nvec_chip *nvec, const
> unsigned char *data, list_add_tail(&msg->node, &nvec->tx_data);
> spin_unlock_irqrestore(&nvec->tx_lock, flags);
>
> - queue_work(nvec->wq, &nvec->tx_work);
> + schedule_work(&nvec->tx_work);
>
> return 0;
> }
> @@ -470,7 +470,7 @@ static void nvec_rx_completed(struct nvec_chip *nvec)
> if (!nvec_msg_is_event(nvec->rx))
> complete(&nvec->ec_transfer);
>
> - queue_work(nvec->wq, &nvec->rx_work);
> + schedule_work(&nvec->rx_work);
> }
>
> /**
> @@ -791,13 +791,11 @@ static int __devinit tegra_nvec_probe(struct
> platform_device *pdev) INIT_LIST_HEAD(&nvec->tx_data);
> INIT_WORK(&nvec->rx_work, nvec_dispatch);
> INIT_WORK(&nvec->tx_work, nvec_request_master);
> - nvec->wq = alloc_workqueue("nvec", WQ_NON_REENTRANT, 2);
>
> err = devm_gpio_request_one(&pdev->dev, nvec->gpio, GPIOF_OUT_INIT_HIGH,
> "nvec gpio");
> if (err < 0) {
> dev_err(nvec->dev, "couldn't request gpio\n");
> - destroy_workqueue(nvec->wq);
> return -ENODEV;
> }
>
> @@ -805,7 +803,6 @@ static int __devinit tegra_nvec_probe(struct
> platform_device *pdev) "nvec", nvec);
> if (err) {
> dev_err(nvec->dev, "couldn't request irq\n");
> - destroy_workqueue(nvec->wq);
> return -ENODEV;
> }
> disable_irq(nvec->irq);
> @@ -859,7 +856,8 @@ static int __devexit tegra_nvec_remove(struct
> platform_device *pdev)
>
> nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3);
> mfd_remove_devices(nvec->dev);
> - destroy_workqueue(nvec->wq);
> + cancel_work_sync(&nvec->rx_work);
> + cancel_work_sync(&nvec->tx_work);
>
> return 0;
> }
> diff --git a/drivers/staging/nvec/nvec.h b/drivers/staging/nvec/nvec.h
> index ba6ed8f..f522dbd 100644
> --- a/drivers/staging/nvec/nvec.h
> +++ b/drivers/staging/nvec/nvec.h
> @@ -139,7 +139,6 @@ struct nvec_platform_data {
> * @nvec_status_notifier: Internal notifier (see nvec_status_notifier())
> * @rx_work: A work structure for the RX worker nvec_dispatch()
> * @tx_work: A work structure for the TX worker nvec_request_master()
> - * @wq: The work queue in which @rx_work and @tx_work are executed
> * @rx: The message currently being retrieved or %NULL
> * @msg_pool: A pool of messages for allocation
> * @tx: The message currently being transferred
> @@ -165,7 +164,6 @@ struct nvec_chip {
> struct list_head rx_data, tx_data;
> struct notifier_block nvec_status_notifier;
> struct work_struct rx_work, tx_work;
> - struct workqueue_struct *wq;
> struct nvec_msg msg_pool[NVEC_POOL_SIZE];
> struct nvec_msg *rx;
>
> diff --git a/drivers/staging/omapdrm/omap_drv.c
> b/drivers/staging/omapdrm/omap_drv.c index 4beab94..672cb3a 100644
> --- a/drivers/staging/omapdrm/omap_drv.c
> +++ b/drivers/staging/omapdrm/omap_drv.c
> @@ -571,8 +571,7 @@ static int dev_load(struct drm_device *dev, unsigned
> long flags)
>
> dev->dev_private = priv;
>
> - priv->wq = alloc_workqueue("omapdrm",
> - WQ_UNBOUND | WQ_NON_REENTRANT, 1);
> + priv->wq = alloc_ordered_workqueue("omapdrm", 0);
>
> INIT_LIST_HEAD(&priv->obj_list);
>
> diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
> index 63dc19c..cd24afd 100644
> --- a/fs/dlm/ast.c
> +++ b/fs/dlm/ast.c
> @@ -267,10 +267,7 @@ void dlm_callback_work(struct work_struct *work)
> int dlm_callback_start(struct dlm_ls *ls)
> {
> ls->ls_callback_wq = alloc_workqueue("dlm_callback",
> - WQ_UNBOUND |
> - WQ_MEM_RECLAIM |
> - WQ_NON_REENTRANT,
> - 0);
> + WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
> if (!ls->ls_callback_wq) {
> log_print("can't start dlm_callback workqueue");
> return -ENOMEM;
> diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
> index e04d0e0..7b0f504 100644
> --- a/fs/gfs2/main.c
> +++ b/fs/gfs2/main.c
> @@ -155,7 +155,7 @@ static int __init init_gfs2_fs(void)
> goto fail_wq;
>
> gfs2_control_wq = alloc_workqueue("gfs2_control",
> - WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0);
> + WQ_UNBOUND | WQ_FREEZABLE, 0);
> if (!gfs2_control_wq)
> goto fail_recovery;
>
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index e8e6be4..c7199a4 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -1531,7 +1531,7 @@ xfs_init_workqueues(void)
> * competing for ressources. Use the default large max_active value
> * so that even lots of filesystems can perform these task in parallel.
> */
> - xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_NON_REENTRANT, 0);
> + xfs_syncd_wq = alloc_workqueue("xfssyncd", 0, 0);
> if (!xfs_syncd_wq)
> return -ENOMEM;
>
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index ce39467..910b1ee 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -3195,6 +3195,9 @@ struct workqueue_struct *__alloc_workqueue_key(const
> char *fmt, unsigned int cpu;
> size_t namelen;
>
> + WARN(flags & WQ_NON_REENTRANT,
> + "workqueue: WQ_NON_REENTRANT is deprecated, all workqueues are
> non-reentrant\n"); +
> /* determine namelen, allocate wq and format name */
> va_start(args, lock_name);
> va_copy(args1, args);
> diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
> index b979675..fe1bd47 100644
> --- a/net/ceph/messenger.c
> +++ b/net/ceph/messenger.c
> @@ -190,7 +190,7 @@ int ceph_msgr_init(void)
> zero_page = ZERO_PAGE(0);
> page_cache_get(zero_page);
>
> - ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
> + ceph_msgr_wq = alloc_workqueue("ceph-msgr", 0, 0);
> if (ceph_msgr_wq)
> return 0;
>
> diff --git a/net/nfc/core.c b/net/nfc/core.c
> index ff74979..b071f97 100644
> --- a/net/nfc/core.c
> +++ b/net/nfc/core.c
> @@ -791,9 +791,9 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
>
> INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
> snprintf(name, sizeof(name), "nfc%d_check_pres_wq", dev->idx);
> - dev->check_pres_wq = alloc_workqueue(name, WQ_NON_REENTRANT |
> - WQ_UNBOUND |
> - WQ_MEM_RECLAIM, 1);
> + /* XXX tj - why does NFC need WQ_MEM_RECLAIM? */
> + dev->check_pres_wq = alloc_ordered_workqueue(name,
> + WQ_MEM_RECLAIM);
> if (dev->check_pres_wq == NULL) {
> kfree(dev);
> return NULL;
> diff --git a/net/nfc/hci/core.c b/net/nfc/hci/core.c
> index 1ac7b3f..5e48792 100644
> --- a/net/nfc/hci/core.c
> +++ b/net/nfc/hci/core.c
> @@ -670,8 +670,8 @@ int nfc_hci_register_device(struct nfc_hci_dev *hdev)
>
> INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
> snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname);
> - hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
> - WQ_MEM_RECLAIM, 1);
> + /* XXX tj - why does NFC need WQ_MEM_RECLAIM? */
> + hdev->msg_tx_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
> if (hdev->msg_tx_wq == NULL) {
> r = -ENOMEM;
> goto exit;
> @@ -685,8 +685,8 @@ int nfc_hci_register_device(struct nfc_hci_dev *hdev)
>
> INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
> snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname);
> - hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
> - WQ_MEM_RECLAIM, 1);
> + /* XXX tj - why does NFC need WQ_MEM_RECLAIM? */
> + hdev->msg_rx_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
> if (hdev->msg_rx_wq == NULL) {
> r = -ENOMEM;
> goto exit;
> diff --git a/net/nfc/hci/shdlc.c b/net/nfc/hci/shdlc.c
> index 6f840c1..04405101 100644
> --- a/net/nfc/hci/shdlc.c
> +++ b/net/nfc/hci/shdlc.c
> @@ -877,8 +877,8 @@ struct nfc_shdlc *nfc_shdlc_allocate(struct
> nfc_shdlc_ops *ops,
>
> INIT_WORK(&shdlc->sm_work, nfc_shdlc_sm_work);
> snprintf(name, sizeof(name), "%s_shdlc_sm_wq", devname);
> - shdlc->sm_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
> - WQ_MEM_RECLAIM, 1);
> + /* XXX tj - why does NFC need WQ_MEM_RECLAIM? */
> + shdlc->sm_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
> if (shdlc->sm_wq == NULL)
> goto err_allocwq;
>
> diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
> index 82f0f75..57d5df2 100644
> --- a/net/nfc/llcp/llcp.c
> +++ b/net/nfc/llcp/llcp.c
> @@ -1150,10 +1150,8 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
> skb_queue_head_init(&local->tx_queue);
> INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
> snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
> - local->tx_wq =
> - alloc_workqueue(name,
> - WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
> - 1);
> + /* XXX tj - why does NFC need WQ_MEM_RECLAIM? */
> + local->tx_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
> if (local->tx_wq == NULL) {
> err = -ENOMEM;
> goto err_local;
> @@ -1162,10 +1160,8 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
> local->rx_pending = NULL;
> INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
> snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
> - local->rx_wq =
> - alloc_workqueue(name,
> - WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
> - 1);
> + /* XXX tj - why does NFC need WQ_MEM_RECLAIM? */
> + local->rx_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
> if (local->rx_wq == NULL) {
> err = -ENOMEM;
> goto err_tx_wq;
> @@ -1173,10 +1169,8 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
>
> INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
> snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
> - local->timeout_wq =
> - alloc_workqueue(name,
> - WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
> - 1);
> + /* XXX tj - why does NFC need WQ_MEM_RECLAIM? */
> + local->timeout_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
> if (local->timeout_wq == NULL) {
> err = -ENOMEM;
> goto err_rx_wq;
--
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