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Date: Thu, 22 Aug 2019 10:08:40 +0000
From: <Claudiu.Beznea@...rochip.com>
To: <poeschel@...onage.de>, <gregkh@...uxfoundation.org>,
<allison@...utok.net>, <swinslow@...il.com>, <tglx@...utronix.de>,
<kstewart@...uxfoundation.org>, <gustavo@...eddedor.com>,
<keescook@...omium.org>, <opensource@...ayne.com>,
<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <johan@...nel.org>
Subject: Re: [PATCH v6 4/7] nfc: pn533: Split pn533 init & nfc_register
On 20.08.2019 15:03, Lars Poeschel wrote:
> There is a problem in the initialisation and setup of the pn533: It
> registers with nfc too early. It could happen, that it finished
> registering with nfc and someone starts using it. But setup of the pn533
> is not yet finished. Bad or at least unintended things could happen.
> So I split out nfc registering (and unregistering) to seperate functions
> that have to be called late in probe then.
>
> Cc: Johan Hovold <johan@...nel.org>
> Signed-off-by: Lars Poeschel <poeschel@...onage.de>
> ---
> Changes in v6:
> - Rebased the patch series on v5.3-rc5
>
> Changes in v5:
> - This patch is new in v5
>
> drivers/nfc/pn533/i2c.c | 17 +++++-----
> drivers/nfc/pn533/pn533.c | 66 ++++++++++++++++++++-------------------
> drivers/nfc/pn533/pn533.h | 11 ++++---
> drivers/nfc/pn533/usb.c | 12 +++++--
> 4 files changed, 59 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/nfc/pn533/i2c.c b/drivers/nfc/pn533/i2c.c
> index 1abd40398a5a..e9e5a1ec8857 100644
> --- a/drivers/nfc/pn533/i2c.c
> +++ b/drivers/nfc/pn533/i2c.c
> @@ -193,12 +193,10 @@ static int pn533_i2c_probe(struct i2c_client *client,
> phy->i2c_dev = client;
> i2c_set_clientdata(client, phy);
>
> - priv = pn533_register_device(PN533_DEVICE_PN532,
> - PN533_NO_TYPE_B_PROTOCOLS,
> + priv = pn53x_common_init(PN533_DEVICE_PN532,
> PN533_PROTO_REQ_ACK_RESP,
> phy, &i2c_phy_ops, NULL,
> - &phy->i2c_dev->dev,
> - &client->dev);
> + &phy->i2c_dev->dev);
>
> if (IS_ERR(priv)) {
> r = PTR_ERR(priv);
> @@ -220,13 +218,17 @@ static int pn533_i2c_probe(struct i2c_client *client,
> if (r)
> goto fn_setup_err;
>
> - return 0;
> + r = pn53x_register_nfc(priv, PN533_NO_TYPE_B_PROTOCOLS, &client->dev);
> + if (r)
> + goto fn_setup_err;
> +
> + return r;
>
> fn_setup_err:
> free_irq(client->irq, phy);
>
> irq_rqst_err:
> - pn533_unregister_device(phy->priv);
> + pn53x_common_clean(phy->priv);
>
> return r;
> }
> @@ -239,7 +241,8 @@ static int pn533_i2c_remove(struct i2c_client *client)
>
> free_irq(client->irq, phy);
>
> - pn533_unregister_device(phy->priv);
> + pn53x_unregister_nfc(phy->priv);
> + pn53x_common_clean(phy->priv);
>
> return 0;
> }
> diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
> index 64836c727aee..a8c756caa678 100644
> --- a/drivers/nfc/pn533/pn533.c
> +++ b/drivers/nfc/pn533/pn533.c
> @@ -2590,14 +2590,12 @@ int pn533_finalize_setup(struct pn533 *dev)
> }
> EXPORT_SYMBOL_GPL(pn533_finalize_setup);
>
> -struct pn533 *pn533_register_device(u32 device_type,
> - u32 protocols,
> +struct pn533 *pn53x_common_init(u32 device_type,
> enum pn533_protocol_type protocol_type,
> void *phy,
> struct pn533_phy_ops *phy_ops,
> struct pn533_frame_ops *fops,
> - struct device *dev,
> - struct device *parent)
> + struct device *dev)
> {
> struct pn533 *priv;
> int rc = -ENOMEM;
> @@ -2638,43 +2636,18 @@ struct pn533 *pn533_register_device(u32 device_type,
> skb_queue_head_init(&priv->fragment_skb);
>
> INIT_LIST_HEAD(&priv->cmd_queue);
> -
> - priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
> - priv->ops->tx_header_len +
> - PN533_CMD_DATAEXCH_HEAD_LEN,
> - priv->ops->tx_tail_len);
> - if (!priv->nfc_dev) {
> - rc = -ENOMEM;
> - goto destroy_wq;
> - }
> -
> - nfc_set_parent_dev(priv->nfc_dev, parent);
> - nfc_set_drvdata(priv->nfc_dev, priv);
> -
> - rc = nfc_register_device(priv->nfc_dev);
> - if (rc)
> - goto free_nfc_dev;
> -
> return priv;
>
> -free_nfc_dev:
> - nfc_free_device(priv->nfc_dev);
> -
> -destroy_wq:
> - destroy_workqueue(priv->wq);
> error:
> kfree(priv);
> return ERR_PTR(rc);
> }
> -EXPORT_SYMBOL_GPL(pn533_register_device);
> +EXPORT_SYMBOL_GPL(pn53x_common_init);
>
> -void pn533_unregister_device(struct pn533 *priv)
> +void pn53x_common_clean(struct pn533 *priv)
> {
> struct pn533_cmd *cmd, *n;
>
> - nfc_unregister_device(priv->nfc_dev);
> - nfc_free_device(priv->nfc_dev);
> -
> flush_delayed_work(&priv->poll_work);
> destroy_workqueue(priv->wq);
>
> @@ -2689,8 +2662,37 @@ void pn533_unregister_device(struct pn533 *priv)
>
> kfree(priv);
> }
> -EXPORT_SYMBOL_GPL(pn533_unregister_device);
> +EXPORT_SYMBOL_GPL(pn53x_common_clean);
> +
> +int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
> + struct device *parent)
> +{
> + int rc = -ENOMEM;
No need to initialize rc here... or just return rc below.
> +
> + priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
> + priv->ops->tx_header_len +
> + PN533_CMD_DATAEXCH_HEAD_LEN,
> + priv->ops->tx_tail_len);
> + if (!priv->nfc_dev)
> + return -ENOMEM;
> +
> + nfc_set_parent_dev(priv->nfc_dev, parent);
> + nfc_set_drvdata(priv->nfc_dev, priv);
> +
> + rc = nfc_register_device(priv->nfc_dev);
> + if (rc)
> + nfc_free_device(priv->nfc_dev);
> +
> + return rc;
> +}
> +EXPORT_SYMBOL_GPL(pn53x_register_nfc);
>
> +void pn53x_unregister_nfc(struct pn533 *priv)
> +{
> + nfc_unregister_device(priv->nfc_dev);
> + nfc_free_device(priv->nfc_dev);
> +}
> +EXPORT_SYMBOL_GPL(pn53x_unregister_nfc);
>
> MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@...nbossa.org>");
> MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>");
> diff --git a/drivers/nfc/pn533/pn533.h b/drivers/nfc/pn533/pn533.h
> index 570ee0a3e832..510ddebbd896 100644
> --- a/drivers/nfc/pn533/pn533.h
> +++ b/drivers/nfc/pn533/pn533.h
> @@ -219,18 +219,19 @@ struct pn533_phy_ops {
> };
>
>
> -struct pn533 *pn533_register_device(u32 device_type,
> - u32 protocols,
> +struct pn533 *pn53x_common_init(u32 device_type,
> enum pn533_protocol_type protocol_type,
> void *phy,
> struct pn533_phy_ops *phy_ops,
> struct pn533_frame_ops *fops,
> - struct device *dev,
> - struct device *parent);
> + struct device *dev);
>
> int pn533_finalize_setup(struct pn533 *dev);
> -void pn533_unregister_device(struct pn533 *priv);
> +void pn53x_common_clean(struct pn533 *priv);
> void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status);
> +int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
> + struct device *parent);
> +void pn53x_unregister_nfc(struct pn533 *priv);
>
> bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame);
> bool pn533_rx_frame_is_ack(void *_frame);
> diff --git a/drivers/nfc/pn533/usb.c b/drivers/nfc/pn533/usb.c
> index c5289eaf17ee..a1c6a41944c6 100644
> --- a/drivers/nfc/pn533/usb.c
> +++ b/drivers/nfc/pn533/usb.c
> @@ -534,9 +534,9 @@ static int pn533_usb_probe(struct usb_interface *interface,
> goto error;
> }
>
> - priv = pn533_register_device(id->driver_info, protocols, protocol_type,
> + priv = pn53x_common_init(id->driver_info, protocol_type,
> phy, &usb_phy_ops, fops,
> - &phy->udev->dev, &interface->dev);
> + &phy->udev->dev);
>
> if (IS_ERR(priv)) {
> rc = PTR_ERR(priv);
> @@ -550,9 +550,14 @@ static int pn533_usb_probe(struct usb_interface *interface,
> goto error;
>
> usb_set_intfdata(interface, phy);
Above this instruction there is this code:
rc = pn533_finalize_setup(priv);
if (rc)
goto error;
Instead of "goto error;" you should have "goto err_clean;"
> + rc = pn53x_register_nfc(priv, protocols, &interface->dev);
> + if (rc)
> + goto err_clean;
>
> return 0;
>
> +err_clean:
> + pn53x_common_clean(priv);
> error:
> usb_free_urb(phy->in_urb);
> usb_free_urb(phy->out_urb);
> @@ -570,7 +575,8 @@ static void pn533_usb_disconnect(struct usb_interface *interface)
> if (!phy)
> return;
>
> - pn533_unregister_device(phy->priv);
> + pn53x_unregister_nfc(phy->priv);
> + pn53x_common_clean(phy->priv);
>
> usb_set_intfdata(interface, NULL);
>
>
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