* [PATCH v2 1/6] staging: wfx: fix init/remove vs IRQ race
2020-02-11 10:34 [PATCH v2 0/6] staging: WF200 driver fixes Michał Mirosław
@ 2020-02-11 10:35 ` Michał Mirosław
2020-02-11 11:19 ` Jérôme Pouiller
2020-02-11 10:35 ` [PATCH v2 2/6] staging: wfx: annotate nested gc_list vs tx queue locking Michał Mirosław
` (4 subsequent siblings)
5 siblings, 1 reply; 10+ messages in thread
From: Michał Mirosław @ 2020-02-11 10:35 UTC (permalink / raw)
To: Jérôme Pouiller, Greg Kroah-Hartman; +Cc: devel, linux-kernel
Current code races in init/exit with interrupt handlers. This is noticed
by the warning below. Fix it by using devres for ordering allocations and
IRQ de/registration.
WARNING: CPU: 0 PID: 827 at drivers/staging/wfx/bus_spi.c:142 wfx_spi_irq_handler+0x5c/0x64 [wfx]
race condition in driver init/deinit
Cc: stable@vger.kernel.org
Fixes: 0096214a59a7 ("staging: wfx: add support for I/O access")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
v2: use devres to fix the races
---
drivers/staging/wfx/bus_sdio.c | 15 ++++++---------
drivers/staging/wfx/bus_spi.c | 27 ++++++++++++++-------------
drivers/staging/wfx/main.c | 21 +++++++++++++--------
drivers/staging/wfx/main.h | 1 -
4 files changed, 33 insertions(+), 31 deletions(-)
diff --git a/drivers/staging/wfx/bus_sdio.c b/drivers/staging/wfx/bus_sdio.c
index f8901164c206..5450bd5e1b5d 100644
--- a/drivers/staging/wfx/bus_sdio.c
+++ b/drivers/staging/wfx/bus_sdio.c
@@ -200,25 +200,23 @@ static int wfx_sdio_probe(struct sdio_func *func,
if (ret)
goto err0;
- ret = wfx_sdio_irq_subscribe(bus);
- if (ret)
- goto err1;
-
bus->core = wfx_init_common(&func->dev, &wfx_sdio_pdata,
&wfx_sdio_hwbus_ops, bus);
if (!bus->core) {
ret = -EIO;
- goto err2;
+ goto err1;
}
+ ret = wfx_sdio_irq_subscribe(bus);
+ if (ret)
+ goto err1;
+
ret = wfx_probe(bus->core);
if (ret)
- goto err3;
+ goto err2;
return 0;
-err3:
- wfx_free_common(bus->core);
err2:
wfx_sdio_irq_unsubscribe(bus);
err1:
@@ -234,7 +232,6 @@ static void wfx_sdio_remove(struct sdio_func *func)
struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
wfx_release(bus->core);
- wfx_free_common(bus->core);
wfx_sdio_irq_unsubscribe(bus);
sdio_claim_host(func);
sdio_disable_func(func);
diff --git a/drivers/staging/wfx/bus_spi.c b/drivers/staging/wfx/bus_spi.c
index 40bc33035de2..605ad74068b7 100644
--- a/drivers/staging/wfx/bus_spi.c
+++ b/drivers/staging/wfx/bus_spi.c
@@ -154,6 +154,11 @@ static void wfx_spi_request_rx(struct work_struct *work)
wfx_bh_request_rx(bus->core);
}
+static void wfx_flush_irq_work(void *w)
+{
+ flush_work(w);
+}
+
static size_t wfx_spi_align_size(void *priv, size_t size)
{
// Most of SPI controllers avoid DMA if buffer size is not 32bit aligned
@@ -207,22 +212,23 @@ static int wfx_spi_probe(struct spi_device *func)
udelay(2000);
}
- ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
- IRQF_TRIGGER_RISING, "wfx", bus);
- if (ret)
- return ret;
-
INIT_WORK(&bus->request_rx, wfx_spi_request_rx);
bus->core = wfx_init_common(&func->dev, &wfx_spi_pdata,
&wfx_spi_hwbus_ops, bus);
if (!bus->core)
return -EIO;
- ret = wfx_probe(bus->core);
+ ret = devm_add_action_or_reset(&func->dev, wfx_flush_irq_work,
+ &bus->request_rx);
if (ret)
- wfx_free_common(bus->core);
+ return ret;
- return ret;
+ ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
+ IRQF_TRIGGER_RISING, "wfx", bus);
+ if (ret)
+ return ret;
+
+ return wfx_probe(bus->core);
}
static int wfx_spi_remove(struct spi_device *func)
@@ -230,11 +236,6 @@ static int wfx_spi_remove(struct spi_device *func)
struct wfx_spi_priv *bus = spi_get_drvdata(func);
wfx_release(bus->core);
- wfx_free_common(bus->core);
- // A few IRQ will be sent during device release. Hopefully, no IRQ
- // should happen after wdev/wvif are released.
- devm_free_irq(&func->dev, func->irq, bus);
- flush_work(&bus->request_rx);
return 0;
}
diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
index 84adad64fc30..76b2ff7fc7fe 100644
--- a/drivers/staging/wfx/main.c
+++ b/drivers/staging/wfx/main.c
@@ -262,6 +262,16 @@ static int wfx_send_pdata_pds(struct wfx_dev *wdev)
return ret;
}
+static void wfx_free_common(void *data)
+{
+ struct wfx_dev *wdev = data;
+
+ mutex_destroy(&wdev->rx_stats_lock);
+ mutex_destroy(&wdev->conf_mutex);
+ wfx_tx_queues_deinit(wdev);
+ ieee80211_free_hw(wdev->hw);
+}
+
struct wfx_dev *wfx_init_common(struct device *dev,
const struct wfx_platform_data *pdata,
const struct hwbus_ops *hwbus_ops,
@@ -332,17 +342,12 @@ struct wfx_dev *wfx_init_common(struct device *dev,
wfx_init_hif_cmd(&wdev->hif_cmd);
wfx_tx_queues_init(wdev);
+ if (devm_add_action_or_reset(dev, wfx_free_common, wdev))
+ return NULL;
+
return wdev;
}
-void wfx_free_common(struct wfx_dev *wdev)
-{
- mutex_destroy(&wdev->rx_stats_lock);
- mutex_destroy(&wdev->conf_mutex);
- wfx_tx_queues_deinit(wdev);
- ieee80211_free_hw(wdev->hw);
-}
-
int wfx_probe(struct wfx_dev *wdev)
{
int i;
diff --git a/drivers/staging/wfx/main.h b/drivers/staging/wfx/main.h
index 875f8c227803..9c9410072def 100644
--- a/drivers/staging/wfx/main.h
+++ b/drivers/staging/wfx/main.h
@@ -34,7 +34,6 @@ struct wfx_dev *wfx_init_common(struct device *dev,
const struct wfx_platform_data *pdata,
const struct hwbus_ops *hwbus_ops,
void *hwbus_priv);
-void wfx_free_common(struct wfx_dev *wdev);
int wfx_probe(struct wfx_dev *wdev);
void wfx_release(struct wfx_dev *wdev);
--
2.20.1
^ permalink raw reply related [flat|nested] 10+ messages in thread* Re: [PATCH v2 1/6] staging: wfx: fix init/remove vs IRQ race
2020-02-11 10:35 ` [PATCH v2 1/6] staging: wfx: fix init/remove vs IRQ race Michał Mirosław
@ 2020-02-11 11:19 ` Jérôme Pouiller
2020-02-11 12:49 ` Michał Mirosław
0 siblings, 1 reply; 10+ messages in thread
From: Jérôme Pouiller @ 2020-02-11 11:19 UTC (permalink / raw)
To: Michał Mirosław; +Cc: Greg Kroah-Hartman, devel, linux-kernel
On Tuesday 11 February 2020 11:35:01 CET Michał Mirosław wrote:
> Current code races in init/exit with interrupt handlers. This is noticed
> by the warning below. Fix it by using devres for ordering allocations and
> IRQ de/registration.
>
> WARNING: CPU: 0 PID: 827 at drivers/staging/wfx/bus_spi.c:142 wfx_spi_irq_handler+0x5c/0x64 [wfx]
> race condition in driver init/deinit
>
> Cc: stable@vger.kernel.org
> Fixes: 0096214a59a7 ("staging: wfx: add support for I/O access")
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> ---
> v2: use devres to fix the races
> ---
> drivers/staging/wfx/bus_sdio.c | 15 ++++++---------
> drivers/staging/wfx/bus_spi.c | 27 ++++++++++++++-------------
> drivers/staging/wfx/main.c | 21 +++++++++++++--------
> drivers/staging/wfx/main.h | 1 -
> 4 files changed, 33 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/staging/wfx/bus_sdio.c b/drivers/staging/wfx/bus_sdio.c
> index f8901164c206..5450bd5e1b5d 100644
> --- a/drivers/staging/wfx/bus_sdio.c
> +++ b/drivers/staging/wfx/bus_sdio.c
> @@ -200,25 +200,23 @@ static int wfx_sdio_probe(struct sdio_func *func,
> if (ret)
> goto err0;
>
> - ret = wfx_sdio_irq_subscribe(bus);
> - if (ret)
> - goto err1;
> -
> bus->core = wfx_init_common(&func->dev, &wfx_sdio_pdata,
> &wfx_sdio_hwbus_ops, bus);
> if (!bus->core) {
> ret = -EIO;
> - goto err2;
> + goto err1;
> }
>
> + ret = wfx_sdio_irq_subscribe(bus);
> + if (ret)
> + goto err1;
> +
> ret = wfx_probe(bus->core);
> if (ret)
> - goto err3;
> + goto err2;
>
> return 0;
>
> -err3:
> - wfx_free_common(bus->core);
> err2:
> wfx_sdio_irq_unsubscribe(bus);
> err1:
> @@ -234,7 +232,6 @@ static void wfx_sdio_remove(struct sdio_func *func)
> struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
>
> wfx_release(bus->core);
> - wfx_free_common(bus->core);
> wfx_sdio_irq_unsubscribe(bus);
> sdio_claim_host(func);
> sdio_disable_func(func);
> diff --git a/drivers/staging/wfx/bus_spi.c b/drivers/staging/wfx/bus_spi.c
> index 40bc33035de2..605ad74068b7 100644
> --- a/drivers/staging/wfx/bus_spi.c
> +++ b/drivers/staging/wfx/bus_spi.c
> @@ -154,6 +154,11 @@ static void wfx_spi_request_rx(struct work_struct *work)
> wfx_bh_request_rx(bus->core);
> }
>
> +static void wfx_flush_irq_work(void *w)
> +{
> + flush_work(w);
> +}
> +
> static size_t wfx_spi_align_size(void *priv, size_t size)
> {
> // Most of SPI controllers avoid DMA if buffer size is not 32bit aligned
> @@ -207,22 +212,23 @@ static int wfx_spi_probe(struct spi_device *func)
> udelay(2000);
> }
>
> - ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
> - IRQF_TRIGGER_RISING, "wfx", bus);
> - if (ret)
> - return ret;
> -
> INIT_WORK(&bus->request_rx, wfx_spi_request_rx);
> bus->core = wfx_init_common(&func->dev, &wfx_spi_pdata,
> &wfx_spi_hwbus_ops, bus);
> if (!bus->core)
> return -EIO;
>
> - ret = wfx_probe(bus->core);
> + ret = devm_add_action_or_reset(&func->dev, wfx_flush_irq_work,
> + &bus->request_rx);
> if (ret)
> - wfx_free_common(bus->core);
> + return ret;
>
> - return ret;
> + ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
> + IRQF_TRIGGER_RISING, "wfx", bus);
> + if (ret)
> + return ret;
> +
> + return wfx_probe(bus->core);
> }
>
> static int wfx_spi_remove(struct spi_device *func)
> @@ -230,11 +236,6 @@ static int wfx_spi_remove(struct spi_device *func)
> struct wfx_spi_priv *bus = spi_get_drvdata(func);
>
> wfx_release(bus->core);
> - wfx_free_common(bus->core);
> - // A few IRQ will be sent during device release. Hopefully, no IRQ
> - // should happen after wdev/wvif are released.
> - devm_free_irq(&func->dev, func->irq, bus);
> - flush_work(&bus->request_rx);
> return 0;
> }
>
> diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
> index 84adad64fc30..76b2ff7fc7fe 100644
> --- a/drivers/staging/wfx/main.c
> +++ b/drivers/staging/wfx/main.c
> @@ -262,6 +262,16 @@ static int wfx_send_pdata_pds(struct wfx_dev *wdev)
> return ret;
> }
>
> +static void wfx_free_common(void *data)
> +{
> + struct wfx_dev *wdev = data;
> +
> + mutex_destroy(&wdev->rx_stats_lock);
> + mutex_destroy(&wdev->conf_mutex);
> + wfx_tx_queues_deinit(wdev);
> + ieee80211_free_hw(wdev->hw);
> +}
> +
> struct wfx_dev *wfx_init_common(struct device *dev,
> const struct wfx_platform_data *pdata,
> const struct hwbus_ops *hwbus_ops,
> @@ -332,17 +342,12 @@ struct wfx_dev *wfx_init_common(struct device *dev,
> wfx_init_hif_cmd(&wdev->hif_cmd);
> wfx_tx_queues_init(wdev);
>
> + if (devm_add_action_or_reset(dev, wfx_free_common, wdev))
> + return NULL;
> +
> return wdev;
> }
>
> -void wfx_free_common(struct wfx_dev *wdev)
> -{
> - mutex_destroy(&wdev->rx_stats_lock);
> - mutex_destroy(&wdev->conf_mutex);
> - wfx_tx_queues_deinit(wdev);
> - ieee80211_free_hw(wdev->hw);
> -}
> -
> int wfx_probe(struct wfx_dev *wdev)
> {
> int i;
> diff --git a/drivers/staging/wfx/main.h b/drivers/staging/wfx/main.h
> index 875f8c227803..9c9410072def 100644
> --- a/drivers/staging/wfx/main.h
> +++ b/drivers/staging/wfx/main.h
> @@ -34,7 +34,6 @@ struct wfx_dev *wfx_init_common(struct device *dev,
> const struct wfx_platform_data *pdata,
> const struct hwbus_ops *hwbus_ops,
> void *hwbus_priv);
> -void wfx_free_common(struct wfx_dev *wdev);
>
> int wfx_probe(struct wfx_dev *wdev);
> void wfx_release(struct wfx_dev *wdev);
> --
> 2.20.1
>
Are you sure you can completely drop wfx_free_common()? If you want to
use devres, I think that wfx_flush_irq_work() should call
wfx_free_common(), no?
--
Jérôme Pouiller
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH v2 1/6] staging: wfx: fix init/remove vs IRQ race
2020-02-11 11:19 ` Jérôme Pouiller
@ 2020-02-11 12:49 ` Michał Mirosław
2020-02-11 15:20 ` Jérôme Pouiller
0 siblings, 1 reply; 10+ messages in thread
From: Michał Mirosław @ 2020-02-11 12:49 UTC (permalink / raw)
To: Jérôme Pouiller; +Cc: Greg Kroah-Hartman, devel, linux-kernel
On Tue, Feb 11, 2020 at 11:19:18AM +0000, Jérôme Pouiller wrote:
> On Tuesday 11 February 2020 11:35:01 CET Michał Mirosław wrote:
> > Current code races in init/exit with interrupt handlers. This is noticed
> > by the warning below. Fix it by using devres for ordering allocations and
> > IRQ de/registration.
> >
> > WARNING: CPU: 0 PID: 827 at drivers/staging/wfx/bus_spi.c:142 wfx_spi_irq_handler+0x5c/0x64 [wfx]
> > race condition in driver init/deinit
[...]
> > --- a/drivers/staging/wfx/bus_spi.c
> > +++ b/drivers/staging/wfx/bus_spi.c
> > @@ -154,6 +154,11 @@ static void wfx_spi_request_rx(struct work_struct *work)
> > wfx_bh_request_rx(bus->core);
> > }
> >
> > +static void wfx_flush_irq_work(void *w)
> > +{
> > + flush_work(w);
> > +}
> > +
> > static size_t wfx_spi_align_size(void *priv, size_t size)
> > {
> > // Most of SPI controllers avoid DMA if buffer size is not 32bit aligned
> > @@ -207,22 +212,23 @@ static int wfx_spi_probe(struct spi_device *func)
> > udelay(2000);
> > }
> >
> > - ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
> > - IRQF_TRIGGER_RISING, "wfx", bus);
> > - if (ret)
> > - return ret;
> > -
> > INIT_WORK(&bus->request_rx, wfx_spi_request_rx);
> > bus->core = wfx_init_common(&func->dev, &wfx_spi_pdata,
> > &wfx_spi_hwbus_ops, bus);
> > if (!bus->core)
> > return -EIO;
> >
> > - ret = wfx_probe(bus->core);
> > + ret = devm_add_action_or_reset(&func->dev, wfx_flush_irq_work,
> > + &bus->request_rx);
> > if (ret)
> > - wfx_free_common(bus->core);
> > + return ret;
> >
> > - return ret;
> > + ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
> > + IRQF_TRIGGER_RISING, "wfx", bus);
> > + if (ret)
> > + return ret;
> > +
> > + return wfx_probe(bus->core);
> > }
> >
> > static int wfx_spi_remove(struct spi_device *func)
> > @@ -230,11 +236,6 @@ static int wfx_spi_remove(struct spi_device *func)
> > struct wfx_spi_priv *bus = spi_get_drvdata(func);
> >
> > wfx_release(bus->core);
> > - wfx_free_common(bus->core);
> > - // A few IRQ will be sent during device release. Hopefully, no IRQ
> > - // should happen after wdev/wvif are released.
> > - devm_free_irq(&func->dev, func->irq, bus);
> > - flush_work(&bus->request_rx);
> > return 0;
> > }
> >
> > diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
> > index 84adad64fc30..76b2ff7fc7fe 100644
> > --- a/drivers/staging/wfx/main.c
> > +++ b/drivers/staging/wfx/main.c
> > @@ -262,6 +262,16 @@ static int wfx_send_pdata_pds(struct wfx_dev *wdev)
> > return ret;
> > }
> >
> > +static void wfx_free_common(void *data)
> > +{
> > + struct wfx_dev *wdev = data;
> > +
> > + mutex_destroy(&wdev->rx_stats_lock);
> > + mutex_destroy(&wdev->conf_mutex);
> > + wfx_tx_queues_deinit(wdev);
> > + ieee80211_free_hw(wdev->hw);
> > +}
> > +
> > struct wfx_dev *wfx_init_common(struct device *dev,
> > const struct wfx_platform_data *pdata,
> > const struct hwbus_ops *hwbus_ops,
> > @@ -332,17 +342,12 @@ struct wfx_dev *wfx_init_common(struct device *dev,
> > wfx_init_hif_cmd(&wdev->hif_cmd);
> > wfx_tx_queues_init(wdev);
> >
> > + if (devm_add_action_or_reset(dev, wfx_free_common, wdev))
> > + return NULL;
> > +
> > return wdev;
> > }
> >
> > -void wfx_free_common(struct wfx_dev *wdev)
> > -{
> > - mutex_destroy(&wdev->rx_stats_lock);
> > - mutex_destroy(&wdev->conf_mutex);
> > - wfx_tx_queues_deinit(wdev);
> > - ieee80211_free_hw(wdev->hw);
> > -}
> > -
> > int wfx_probe(struct wfx_dev *wdev)
> > {
> > int i;
> > diff --git a/drivers/staging/wfx/main.h b/drivers/staging/wfx/main.h
> > index 875f8c227803..9c9410072def 100644
> > --- a/drivers/staging/wfx/main.h
> > +++ b/drivers/staging/wfx/main.h
> > @@ -34,7 +34,6 @@ struct wfx_dev *wfx_init_common(struct device *dev,
> > const struct wfx_platform_data *pdata,
> > const struct hwbus_ops *hwbus_ops,
> > void *hwbus_priv);
> > -void wfx_free_common(struct wfx_dev *wdev);
> >
> > int wfx_probe(struct wfx_dev *wdev);
> > void wfx_release(struct wfx_dev *wdev);
> > --
> > 2.20.1
> >
>
> Are you sure you can completely drop wfx_free_common()? If you want to
> use devres, I think that wfx_flush_irq_work() should call
> wfx_free_common(), no?
wfx_free_common() will be called by devres in the right order. That's ensured
by devm_add_action_or_reset() at the end of wfx_init_common().
Best Regards,
Michał Mirosław
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH v2 1/6] staging: wfx: fix init/remove vs IRQ race
2020-02-11 12:49 ` Michał Mirosław
@ 2020-02-11 15:20 ` Jérôme Pouiller
0 siblings, 0 replies; 10+ messages in thread
From: Jérôme Pouiller @ 2020-02-11 15:20 UTC (permalink / raw)
To: Michał Mirosław; +Cc: Greg Kroah-Hartman, devel, linux-kernel
On Tuesday 11 February 2020 13:49:22 CET Michał Mirosław wrote:
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
>
>
> On Tue, Feb 11, 2020 at 11:19:18AM +0000, Jérôme Pouiller wrote:
> > On Tuesday 11 February 2020 11:35:01 CET Michał Mirosław wrote:
> > > Current code races in init/exit with interrupt handlers. This is noticed
> > > by the warning below. Fix it by using devres for ordering allocations and
> > > IRQ de/registration.
> > >
> > > WARNING: CPU: 0 PID: 827 at drivers/staging/wfx/bus_spi.c:142 wfx_spi_irq_handler+0x5c/0x64 [wfx]
> > > race condition in driver init/deinit
> [...]
> > > --- a/drivers/staging/wfx/bus_spi.c
> > > +++ b/drivers/staging/wfx/bus_spi.c
> > > @@ -154,6 +154,11 @@ static void wfx_spi_request_rx(struct work_struct *work)
> > > wfx_bh_request_rx(bus->core);
> > > }
> > >
> > > +static void wfx_flush_irq_work(void *w)
> > > +{
> > > + flush_work(w);
> > > +}
> > > +
> > > static size_t wfx_spi_align_size(void *priv, size_t size)
> > > {
> > > // Most of SPI controllers avoid DMA if buffer size is not 32bit aligned
> > > @@ -207,22 +212,23 @@ static int wfx_spi_probe(struct spi_device *func)
> > > udelay(2000);
> > > }
> > >
> > > - ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
> > > - IRQF_TRIGGER_RISING, "wfx", bus);
> > > - if (ret)
> > > - return ret;
> > > -
> > > INIT_WORK(&bus->request_rx, wfx_spi_request_rx);
> > > bus->core = wfx_init_common(&func->dev, &wfx_spi_pdata,
> > > &wfx_spi_hwbus_ops, bus);
> > > if (!bus->core)
> > > return -EIO;
> > >
> > > - ret = wfx_probe(bus->core);
> > > + ret = devm_add_action_or_reset(&func->dev, wfx_flush_irq_work,
> > > + &bus->request_rx);
> > > if (ret)
> > > - wfx_free_common(bus->core);
> > > + return ret;
> > >
> > > - return ret;
> > > + ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
> > > + IRQF_TRIGGER_RISING, "wfx", bus);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + return wfx_probe(bus->core);
> > > }
> > >
> > > static int wfx_spi_remove(struct spi_device *func)
> > > @@ -230,11 +236,6 @@ static int wfx_spi_remove(struct spi_device *func)
> > > struct wfx_spi_priv *bus = spi_get_drvdata(func);
> > >
> > > wfx_release(bus->core);
> > > - wfx_free_common(bus->core);
> > > - // A few IRQ will be sent during device release. Hopefully, no IRQ
> > > - // should happen after wdev/wvif are released.
> > > - devm_free_irq(&func->dev, func->irq, bus);
> > > - flush_work(&bus->request_rx);
> > > return 0;
> > > }
> > >
> > > diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
> > > index 84adad64fc30..76b2ff7fc7fe 100644
> > > --- a/drivers/staging/wfx/main.c
> > > +++ b/drivers/staging/wfx/main.c
> > > @@ -262,6 +262,16 @@ static int wfx_send_pdata_pds(struct wfx_dev *wdev)
> > > return ret;
> > > }
> > >
> > > +static void wfx_free_common(void *data)
> > > +{
> > > + struct wfx_dev *wdev = data;
> > > +
> > > + mutex_destroy(&wdev->rx_stats_lock);
> > > + mutex_destroy(&wdev->conf_mutex);
> > > + wfx_tx_queues_deinit(wdev);
> > > + ieee80211_free_hw(wdev->hw);
> > > +}
> > > +
> > > struct wfx_dev *wfx_init_common(struct device *dev,
> > > const struct wfx_platform_data *pdata,
> > > const struct hwbus_ops *hwbus_ops,
> > > @@ -332,17 +342,12 @@ struct wfx_dev *wfx_init_common(struct device *dev,
> > > wfx_init_hif_cmd(&wdev->hif_cmd);
> > > wfx_tx_queues_init(wdev);
> > >
> > > + if (devm_add_action_or_reset(dev, wfx_free_common, wdev))
> > > + return NULL;
> > > +
> > > return wdev;
> > > }
> > >
> > > -void wfx_free_common(struct wfx_dev *wdev)
> > > -{
> > > - mutex_destroy(&wdev->rx_stats_lock);
> > > - mutex_destroy(&wdev->conf_mutex);
> > > - wfx_tx_queues_deinit(wdev);
> > > - ieee80211_free_hw(wdev->hw);
> > > -}
> > > -
> > > int wfx_probe(struct wfx_dev *wdev)
> > > {
> > > int i;
> > > diff --git a/drivers/staging/wfx/main.h b/drivers/staging/wfx/main.h
> > > index 875f8c227803..9c9410072def 100644
> > > --- a/drivers/staging/wfx/main.h
> > > +++ b/drivers/staging/wfx/main.h
> > > @@ -34,7 +34,6 @@ struct wfx_dev *wfx_init_common(struct device *dev,
> > > const struct wfx_platform_data *pdata,
> > > const struct hwbus_ops *hwbus_ops,
> > > void *hwbus_priv);
> > > -void wfx_free_common(struct wfx_dev *wdev);
> > >
> > > int wfx_probe(struct wfx_dev *wdev);
> > > void wfx_release(struct wfx_dev *wdev);
> > > --
> > > 2.20.1
> > >
> >
> > Are you sure you can completely drop wfx_free_common()? If you want to
> > use devres, I think that wfx_flush_irq_work() should call
> > wfx_free_common(), no?
>
> wfx_free_common() will be called by devres in the right order. That's ensured
> by devm_add_action_or_reset() at the end of wfx_init_common().
Indeed.
Reviewed-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
--
Jérôme Pouiller
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH v2 2/6] staging: wfx: annotate nested gc_list vs tx queue locking
2020-02-11 10:34 [PATCH v2 0/6] staging: WF200 driver fixes Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 1/6] staging: wfx: fix init/remove vs IRQ race Michał Mirosław
@ 2020-02-11 10:35 ` Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 3/6] staging: wfx: add proper "compatible" string Michał Mirosław
` (3 subsequent siblings)
5 siblings, 0 replies; 10+ messages in thread
From: Michał Mirosław @ 2020-02-11 10:35 UTC (permalink / raw)
To: Jérôme Pouiller, Greg Kroah-Hartman; +Cc: devel, linux-kernel
Lockdep is complaining about recursive locking, because it can't make
a difference between locked skb_queues. Annotate nested locks and avoid
double bh_disable/enable.
[...]
insmod/815 is trying to acquire lock:
cb7d6418 (&(&list->lock)->rlock){+...}, at: wfx_tx_queues_clear+0xfc/0x198 [wfx]
but task is already holding lock:
cb7d61f4 (&(&list->lock)->rlock){+...}, at: wfx_tx_queues_clear+0xa0/0x198 [wfx]
[...]
Possible unsafe locking scenario:
CPU0
----
lock(&(&list->lock)->rlock);
lock(&(&list->lock)->rlock);
Cc: stable@vger.kernel.org
Fixes: 9bca45f3d692 ("staging: wfx: allow to send 802.11 frames")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
drivers/staging/wfx/queue.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
index 0bcc61feee1d..51d6c55ae91f 100644
--- a/drivers/staging/wfx/queue.c
+++ b/drivers/staging/wfx/queue.c
@@ -130,12 +130,12 @@ static void wfx_tx_queue_clear(struct wfx_dev *wdev, struct wfx_queue *queue,
spin_lock_bh(&queue->queue.lock);
while ((item = __skb_dequeue(&queue->queue)) != NULL)
skb_queue_head(gc_list, item);
- spin_lock_bh(&stats->pending.lock);
+ spin_lock_nested(&stats->pending.lock, 1);
for (i = 0; i < ARRAY_SIZE(stats->link_map_cache); ++i) {
stats->link_map_cache[i] -= queue->link_map_cache[i];
queue->link_map_cache[i] = 0;
}
- spin_unlock_bh(&stats->pending.lock);
+ spin_unlock(&stats->pending.lock);
spin_unlock_bh(&queue->queue.lock);
}
@@ -207,9 +207,9 @@ void wfx_tx_queue_put(struct wfx_dev *wdev, struct wfx_queue *queue,
++queue->link_map_cache[tx_priv->link_id];
- spin_lock_bh(&stats->pending.lock);
+ spin_lock_nested(&stats->pending.lock, 1);
++stats->link_map_cache[tx_priv->link_id];
- spin_unlock_bh(&stats->pending.lock);
+ spin_unlock(&stats->pending.lock);
spin_unlock_bh(&queue->queue.lock);
}
@@ -237,11 +237,11 @@ static struct sk_buff *wfx_tx_queue_get(struct wfx_dev *wdev,
__skb_unlink(skb, &queue->queue);
--queue->link_map_cache[tx_priv->link_id];
- spin_lock_bh(&stats->pending.lock);
+ spin_lock_nested(&stats->pending.lock, 1);
__skb_queue_tail(&stats->pending, skb);
if (!--stats->link_map_cache[tx_priv->link_id])
wakeup_stats = true;
- spin_unlock_bh(&stats->pending.lock);
+ spin_unlock(&stats->pending.lock);
}
spin_unlock_bh(&queue->queue.lock);
if (wakeup_stats)
@@ -259,10 +259,10 @@ int wfx_pending_requeue(struct wfx_dev *wdev, struct sk_buff *skb)
spin_lock_bh(&queue->queue.lock);
++queue->link_map_cache[tx_priv->link_id];
- spin_lock_bh(&stats->pending.lock);
+ spin_lock_nested(&stats->pending.lock, 1);
++stats->link_map_cache[tx_priv->link_id];
__skb_unlink(skb, &stats->pending);
- spin_unlock_bh(&stats->pending.lock);
+ spin_unlock(&stats->pending.lock);
__skb_queue_tail(&queue->queue, skb);
spin_unlock_bh(&queue->queue.lock);
return 0;
--
2.20.1
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 3/6] staging: wfx: add proper "compatible" string
2020-02-11 10:34 [PATCH v2 0/6] staging: WF200 driver fixes Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 1/6] staging: wfx: fix init/remove vs IRQ race Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 2/6] staging: wfx: annotate nested gc_list vs tx queue locking Michał Mirosław
@ 2020-02-11 10:35 ` Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 4/6] staging: wfx: follow compatible = vendor,chip format Michał Mirosław
` (2 subsequent siblings)
5 siblings, 0 replies; 10+ messages in thread
From: Michał Mirosław @ 2020-02-11 10:35 UTC (permalink / raw)
To: Jérôme Pouiller, Greg Kroah-Hartman; +Cc: devel, linux-kernel
Add "compatible" string matching "vendor,chip" template and proper
GPIO flags handling. Keep support for old name and reset polarity
for older devicetrees.
Cc: stable@vger.kernel.org # d3a5bcb4a17f ("gpio: add gpiod_toggle_active_low()")
Cc: stable@vger.kernel.org
Fixes: 0096214a59a7 ("staging: wfx: add support for I/O access")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
.../bindings/net/wireless/siliabs,wfx.txt | 7 ++++---
drivers/staging/wfx/bus_spi.c | 14 ++++++++++----
2 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt b/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt
index 26de6762b942..52f97673da1e 100644
--- a/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt
+++ b/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt
@@ -6,7 +6,7 @@ SPI
You have to declare the WFxxx chip in your device tree.
Required properties:
- - compatible: Should be "silabs,wfx-spi"
+ - compatible: Should be "silabs,wf200"
- reg: Chip select address of device
- spi-max-frequency: Maximum SPI clocking speed of device in Hz
- interrupts-extended: Should contain interrupt line (interrupt-parent +
@@ -15,6 +15,7 @@ Required properties:
Optional properties:
- reset-gpios: phandle of gpio that will be used to reset chip during probe.
Without this property, you may encounter issues with warm boot.
+ (Legacy: when compatible == "silabs,wfx-spi", the gpio is inverted.)
Please consult Documentation/devicetree/bindings/spi/spi-bus.txt for optional
SPI connection related properties,
@@ -23,12 +24,12 @@ Example:
&spi1 {
wfx {
- compatible = "silabs,wfx-spi";
+ compatible = "silabs,wf200";
pinctrl-names = "default";
pinctrl-0 = <&wfx_irq &wfx_gpios>;
interrupts-extended = <&gpio 16 IRQ_TYPE_EDGE_RISING>;
wakeup-gpios = <&gpio 12 GPIO_ACTIVE_HIGH>;
- reset-gpios = <&gpio 13 GPIO_ACTIVE_HIGH>;
+ reset-gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
reg = <0>;
spi-max-frequency = <42000000>;
};
diff --git a/drivers/staging/wfx/bus_spi.c b/drivers/staging/wfx/bus_spi.c
index 605ad74068b7..d6a75bd61595 100644
--- a/drivers/staging/wfx/bus_spi.c
+++ b/drivers/staging/wfx/bus_spi.c
@@ -27,6 +27,8 @@ MODULE_PARM_DESC(gpio_reset, "gpio number for reset. -1 for none.");
#define SET_WRITE 0x7FFF /* usage: and operation */
#define SET_READ 0x8000 /* usage: or operation */
+#define WFX_RESET_INVERTED 1
+
static const struct wfx_platform_data wfx_spi_pdata = {
.file_fw = "wfm_wf200",
.file_pds = "wf200.pds",
@@ -206,9 +208,11 @@ static int wfx_spi_probe(struct spi_device *func)
if (!bus->gpio_reset) {
dev_warn(&func->dev, "try to load firmware anyway\n");
} else {
- gpiod_set_value(bus->gpio_reset, 0);
- udelay(100);
+ if (spi_get_device_id(func)->driver_data & WFX_RESET_INVERTED)
+ gpiod_toggle_active_low(bus->gpio_reset);
gpiod_set_value(bus->gpio_reset, 1);
+ udelay(100);
+ gpiod_set_value(bus->gpio_reset, 0);
udelay(2000);
}
@@ -245,14 +249,16 @@ static int wfx_spi_remove(struct spi_device *func)
* stripped.
*/
static const struct spi_device_id wfx_spi_id[] = {
- { "wfx-spi", 0 },
+ { "wfx-spi", WFX_RESET_INVERTED },
+ { "wf200", 0 },
{ },
};
MODULE_DEVICE_TABLE(spi, wfx_spi_id);
#ifdef CONFIG_OF
static const struct of_device_id wfx_spi_of_match[] = {
- { .compatible = "silabs,wfx-spi" },
+ { .compatible = "silabs,wfx-spi", .data = (void *)WFX_RESET_INVERTED },
+ { .compatible = "silabs,wf200" },
{ },
};
MODULE_DEVICE_TABLE(of, wfx_spi_of_match);
--
2.20.1
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 4/6] staging: wfx: follow compatible = vendor,chip format
2020-02-11 10:34 [PATCH v2 0/6] staging: WF200 driver fixes Michał Mirosław
` (2 preceding siblings ...)
2020-02-11 10:35 ` [PATCH v2 3/6] staging: wfx: add proper "compatible" string Michał Mirosław
@ 2020-02-11 10:35 ` Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 5/6] staging: wfx: use sleeping gpio accessors Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 6/6] staging: wfx: use more power-efficient sleep for reset Michał Mirosław
5 siblings, 0 replies; 10+ messages in thread
From: Michał Mirosław @ 2020-02-11 10:35 UTC (permalink / raw)
To: Jérôme Pouiller, Greg Kroah-Hartman; +Cc: devel, linux-kernel
As for SPI, follow "vendor,chip" format 'compatible' string also for
SDIO bus.
Fixes: 0096214a59a7 ("staging: wfx: add support for I/O access")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
.../devicetree/bindings/net/wireless/siliabs,wfx.txt | 4 ++--
drivers/staging/wfx/bus_sdio.c | 1 +
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt b/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt
index 52f97673da1e..ffec79c14786 100644
--- a/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt
+++ b/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt
@@ -45,7 +45,7 @@ case. Thus declaring WFxxx chip in device tree is strongly recommended (and may
become mandatory in the future).
Required properties:
- - compatible: Should be "silabs,wfx-sdio"
+ - compatible: Should be "silabs,wf200"
- reg: Should be 1
In addition, it is recommended to declare a mmc-pwrseq on SDIO host above WFx.
@@ -71,7 +71,7 @@ Example:
#size = <0>;
mmc@1 {
- compatible = "silabs,wfx-sdio";
+ compatible = "silabs,wf200";
reg = <1>;
pinctrl-names = "default";
pinctrl-0 = <&wfx_wakeup>;
diff --git a/drivers/staging/wfx/bus_sdio.c b/drivers/staging/wfx/bus_sdio.c
index 5450bd5e1b5d..dedc3ff58d3e 100644
--- a/drivers/staging/wfx/bus_sdio.c
+++ b/drivers/staging/wfx/bus_sdio.c
@@ -251,6 +251,7 @@ MODULE_DEVICE_TABLE(sdio, wfx_sdio_ids);
#ifdef CONFIG_OF
static const struct of_device_id wfx_sdio_of_match[] = {
{ .compatible = "silabs,wfx-sdio" },
+ { .compatible = "silabs,wf200" },
{ },
};
MODULE_DEVICE_TABLE(of, wfx_sdio_of_match);
--
2.20.1
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 5/6] staging: wfx: use sleeping gpio accessors
2020-02-11 10:34 [PATCH v2 0/6] staging: WF200 driver fixes Michał Mirosław
` (3 preceding siblings ...)
2020-02-11 10:35 ` [PATCH v2 4/6] staging: wfx: follow compatible = vendor,chip format Michał Mirosław
@ 2020-02-11 10:35 ` Michał Mirosław
2020-02-11 10:35 ` [PATCH v2 6/6] staging: wfx: use more power-efficient sleep for reset Michał Mirosław
5 siblings, 0 replies; 10+ messages in thread
From: Michał Mirosław @ 2020-02-11 10:35 UTC (permalink / raw)
To: Jérôme Pouiller, Greg Kroah-Hartman; +Cc: devel, linux-kernel
Driver calls GPIO get/set only from non-atomic context and so can use any
GPIOs.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
drivers/staging/wfx/bh.c | 6 +++---
drivers/staging/wfx/bus_spi.c | 4 ++--
drivers/staging/wfx/main.c | 2 +-
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/wfx/bh.c b/drivers/staging/wfx/bh.c
index 983c41d1fe7c..c6319ab7e71a 100644
--- a/drivers/staging/wfx/bh.c
+++ b/drivers/staging/wfx/bh.c
@@ -20,10 +20,10 @@ static void device_wakeup(struct wfx_dev *wdev)
{
if (!wdev->pdata.gpio_wakeup)
return;
- if (gpiod_get_value(wdev->pdata.gpio_wakeup))
+ if (gpiod_get_value_cansleep(wdev->pdata.gpio_wakeup))
return;
- gpiod_set_value(wdev->pdata.gpio_wakeup, 1);
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
if (wfx_api_older_than(wdev, 1, 4)) {
if (!completion_done(&wdev->hif.ctrl_ready))
udelay(2000);
@@ -45,7 +45,7 @@ static void device_release(struct wfx_dev *wdev)
if (!wdev->pdata.gpio_wakeup)
return;
- gpiod_set_value(wdev->pdata.gpio_wakeup, 0);
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 0);
}
static int rx_helper(struct wfx_dev *wdev, size_t read_len, int *is_cnf)
diff --git a/drivers/staging/wfx/bus_spi.c b/drivers/staging/wfx/bus_spi.c
index d6a75bd61595..e3cd12592662 100644
--- a/drivers/staging/wfx/bus_spi.c
+++ b/drivers/staging/wfx/bus_spi.c
@@ -210,9 +210,9 @@ static int wfx_spi_probe(struct spi_device *func)
} else {
if (spi_get_device_id(func)->driver_data & WFX_RESET_INVERTED)
gpiod_toggle_active_low(bus->gpio_reset);
- gpiod_set_value(bus->gpio_reset, 1);
+ gpiod_set_value_cansleep(bus->gpio_reset, 1);
udelay(100);
- gpiod_set_value(bus->gpio_reset, 0);
+ gpiod_set_value_cansleep(bus->gpio_reset, 0);
udelay(2000);
}
diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
index 76b2ff7fc7fe..3c4c240229ad 100644
--- a/drivers/staging/wfx/main.c
+++ b/drivers/staging/wfx/main.c
@@ -425,7 +425,7 @@ int wfx_probe(struct wfx_dev *wdev)
"enable 'quiescent' power mode with gpio %d and PDS file %s\n",
desc_to_gpio(wdev->pdata.gpio_wakeup),
wdev->pdata.file_pds);
- gpiod_set_value(wdev->pdata.gpio_wakeup, 1);
+ gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
control_reg_write(wdev, 0);
hif_set_operational_mode(wdev, HIF_OP_POWER_MODE_QUIESCENT);
} else {
--
2.20.1
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 6/6] staging: wfx: use more power-efficient sleep for reset
2020-02-11 10:34 [PATCH v2 0/6] staging: WF200 driver fixes Michał Mirosław
` (4 preceding siblings ...)
2020-02-11 10:35 ` [PATCH v2 5/6] staging: wfx: use sleeping gpio accessors Michał Mirosław
@ 2020-02-11 10:35 ` Michał Mirosław
5 siblings, 0 replies; 10+ messages in thread
From: Michał Mirosław @ 2020-02-11 10:35 UTC (permalink / raw)
To: Jérôme Pouiller, Greg Kroah-Hartman; +Cc: devel, linux-kernel
Replace udelay() with usleep_range() as all uses are in a sleepable context.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
drivers/staging/wfx/bh.c | 2 +-
drivers/staging/wfx/bus_spi.c | 4 ++--
drivers/staging/wfx/hwio.c | 2 +-
3 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/wfx/bh.c b/drivers/staging/wfx/bh.c
index c6319ab7e71a..9fcab00a3733 100644
--- a/drivers/staging/wfx/bh.c
+++ b/drivers/staging/wfx/bh.c
@@ -26,7 +26,7 @@ static void device_wakeup(struct wfx_dev *wdev)
gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
if (wfx_api_older_than(wdev, 1, 4)) {
if (!completion_done(&wdev->hif.ctrl_ready))
- udelay(2000);
+ usleep_range(2000, 2500);
} else {
// completion.h does not provide any function to wait
// completion without consume it (a kind of
diff --git a/drivers/staging/wfx/bus_spi.c b/drivers/staging/wfx/bus_spi.c
index e3cd12592662..61e99b09decb 100644
--- a/drivers/staging/wfx/bus_spi.c
+++ b/drivers/staging/wfx/bus_spi.c
@@ -211,9 +211,9 @@ static int wfx_spi_probe(struct spi_device *func)
if (spi_get_device_id(func)->driver_data & WFX_RESET_INVERTED)
gpiod_toggle_active_low(bus->gpio_reset);
gpiod_set_value_cansleep(bus->gpio_reset, 1);
- udelay(100);
+ usleep_range(100, 150);
gpiod_set_value_cansleep(bus->gpio_reset, 0);
- udelay(2000);
+ usleep_range(2000, 2500);
}
INIT_WORK(&bus->request_rx, wfx_spi_request_rx);
diff --git a/drivers/staging/wfx/hwio.c b/drivers/staging/wfx/hwio.c
index 47e04c59ed93..d3a141d95a0e 100644
--- a/drivers/staging/wfx/hwio.c
+++ b/drivers/staging/wfx/hwio.c
@@ -142,7 +142,7 @@ static int indirect_read(struct wfx_dev *wdev, int reg, u32 addr, void *buf,
goto err;
if (!(cfg & prefetch))
break;
- udelay(200);
+ usleep_range(200, 250);
}
if (i == 20) {
ret = -ETIMEDOUT;
--
2.20.1
^ permalink raw reply related [flat|nested] 10+ messages in thread