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Date: Fri, 20 Apr 2012 16:50:02 -0400
From: Jarod Wilson <jarod@...hat.com>
To: Luis Henriques <luis.henriques@...onical.com>
Cc: Mauro Carvalho Chehab <mchehab@...radead.org>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Subject: Re: [PATCH v2] [media] rc: Postpone ISR registration
On Thu, Apr 19, 2012 at 10:37:17PM +0100, Luis Henriques wrote:
> An early registration of an ISR was causing a crash to several users (for
> example, with the ite-cir driver: http://bugs.launchpad.net/bugs/972723).
> The reason was that IRQs were being triggered before a driver
> initialisation was completed.
>
> This patch fixes this by moving the invocation to request_irq() and to
> request_region() to a later stage on the driver probe function.
>
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
> ---
> drivers/media/rc/ene_ir.c | 29 ++++++++++----------
> drivers/media/rc/fintek-cir.c | 17 ++++++------
> drivers/media/rc/ite-cir.c | 18 ++++++-------
> drivers/media/rc/nuvoton-cir.c | 33 ++++++++++++-----------
> drivers/media/rc/winbond-cir.c | 58 ++++++++++++++++++++--------------------
> 5 files changed, 79 insertions(+), 76 deletions(-)
>
> diff --git a/drivers/media/rc/ene_ir.c b/drivers/media/rc/ene_ir.c
> index 860c112..b38c5c7 100644
> --- a/drivers/media/rc/ene_ir.c
> +++ b/drivers/media/rc/ene_ir.c
> @@ -1018,21 +1018,7 @@ static int ene_probe(struct pnp_dev *pnp_dev, const struct pnp_device_id *id)
>
> spin_lock_init(&dev->hw_lock);
>
> - /* claim the resources */
> error = -EBUSY;
In each of these, I believe the setting of retval to -EBUSY needs to be
moved as well, or you're passing along a success retval from another
operatoin between here and where the request_foo functions moved.
> - dev->hw_io = pnp_port_start(pnp_dev, 0);
> - if (!request_region(dev->hw_io, ENE_IO_SIZE, ENE_DRIVER_NAME)) {
> - dev->hw_io = -1;
> - dev->irq = -1;
> - goto error;
> - }
> -
> - dev->irq = pnp_irq(pnp_dev, 0);
> - if (request_irq(dev->irq, ene_isr,
> - IRQF_SHARED, ENE_DRIVER_NAME, (void *)dev)) {
> - dev->irq = -1;
> - goto error;
> - }
>
> pnp_set_drvdata(pnp_dev, dev);
> dev->pnp_dev = pnp_dev;
> @@ -1086,6 +1072,21 @@ static int ene_probe(struct pnp_dev *pnp_dev, const struct pnp_device_id *id)
> device_set_wakeup_capable(&pnp_dev->dev, true);
> device_set_wakeup_enable(&pnp_dev->dev, true);
>
> + /* claim the resources */
> + dev->hw_io = pnp_port_start(pnp_dev, 0);
> + if (!request_region(dev->hw_io, ENE_IO_SIZE, ENE_DRIVER_NAME)) {
> + dev->hw_io = -1;
> + dev->irq = -1;
> + goto error;
> + }
> +
> + dev->irq = pnp_irq(pnp_dev, 0);
> + if (request_irq(dev->irq, ene_isr,
> + IRQF_SHARED, ENE_DRIVER_NAME, (void *)dev)) {
> + dev->irq = -1;
> + goto error;
> + }
> +
> error = rc_register_device(rdev);
> if (error < 0)
> goto error;
> diff --git a/drivers/media/rc/fintek-cir.c b/drivers/media/rc/fintek-cir.c
> index 392d4be..c6273c5 100644
> --- a/drivers/media/rc/fintek-cir.c
> +++ b/drivers/media/rc/fintek-cir.c
> @@ -515,14 +515,6 @@ static int fintek_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id
> spin_lock_init(&fintek->fintek_lock);
>
> ret = -EBUSY;
> - /* now claim resources */
> - if (!request_region(fintek->cir_addr,
> - fintek->cir_port_len, FINTEK_DRIVER_NAME))
> - goto failure;
> -
> - if (request_irq(fintek->cir_irq, fintek_cir_isr, IRQF_SHARED,
> - FINTEK_DRIVER_NAME, (void *)fintek))
> - goto failure;
>
> pnp_set_drvdata(pdev, fintek);
> fintek->pdev = pdev;
> @@ -558,6 +550,15 @@ static int fintek_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id
> /* rx resolution is hardwired to 50us atm, 1, 25, 100 also possible */
> rdev->rx_resolution = US_TO_NS(CIR_SAMPLE_PERIOD);
>
> + /* now claim resources */
> + if (!request_region(fintek->cir_addr,
> + fintek->cir_port_len, FINTEK_DRIVER_NAME))
> + goto failure;
> +
> + if (request_irq(fintek->cir_irq, fintek_cir_isr, IRQF_SHARED,
> + FINTEK_DRIVER_NAME, (void *)fintek))
> + goto failure;
> +
> ret = rc_register_device(rdev);
> if (ret)
> goto failure;
> diff --git a/drivers/media/rc/ite-cir.c b/drivers/media/rc/ite-cir.c
> index 682009d..d88b304 100644
> --- a/drivers/media/rc/ite-cir.c
> +++ b/drivers/media/rc/ite-cir.c
> @@ -1516,15 +1516,6 @@ static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id
> init_ir_raw_event(&itdev->rawir);
>
> ret = -EBUSY;
> - /* now claim resources */
> - if (!request_region(itdev->cir_addr,
> - dev_desc->io_region_size, ITE_DRIVER_NAME))
> - goto failure;
> -
> - if (request_irq(itdev->cir_irq, ite_cir_isr, IRQF_SHARED,
> - ITE_DRIVER_NAME, (void *)itdev))
> - goto failure;
> -
> /* set driver data into the pnp device */
> pnp_set_drvdata(pdev, itdev);
> itdev->pdev = pdev;
> @@ -1600,6 +1591,15 @@ static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id
> rdev->driver_name = ITE_DRIVER_NAME;
> rdev->map_name = RC_MAP_RC6_MCE;
>
> + /* now claim resources */
> + if (!request_region(itdev->cir_addr,
> + dev_desc->io_region_size, ITE_DRIVER_NAME))
> + goto failure;
> +
> + if (request_irq(itdev->cir_irq, ite_cir_isr, IRQF_SHARED,
> + ITE_DRIVER_NAME, (void *)itdev))
> + goto failure;
> +
> ret = rc_register_device(rdev);
> if (ret)
> goto failure;
> diff --git a/drivers/media/rc/nuvoton-cir.c b/drivers/media/rc/nuvoton-cir.c
> index 144f3f5..8afe549 100644
> --- a/drivers/media/rc/nuvoton-cir.c
> +++ b/drivers/media/rc/nuvoton-cir.c
> @@ -1022,22 +1022,6 @@ static int nvt_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id)
> spin_lock_init(&nvt->tx.lock);
>
> ret = -EBUSY;
> - /* now claim resources */
> - if (!request_region(nvt->cir_addr,
> - CIR_IOREG_LENGTH, NVT_DRIVER_NAME))
> - goto failure;
> -
> - if (request_irq(nvt->cir_irq, nvt_cir_isr, IRQF_SHARED,
> - NVT_DRIVER_NAME, (void *)nvt))
> - goto failure;
> -
> - if (!request_region(nvt->cir_wake_addr,
> - CIR_IOREG_LENGTH, NVT_DRIVER_NAME))
> - goto failure;
> -
> - if (request_irq(nvt->cir_wake_irq, nvt_cir_wake_isr, IRQF_SHARED,
> - NVT_DRIVER_NAME, (void *)nvt))
> - goto failure;
>
> pnp_set_drvdata(pdev, nvt);
> nvt->pdev = pdev;
> @@ -1085,6 +1069,23 @@ static int nvt_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id)
> rdev->tx_resolution = XYZ;
> #endif
>
> + /* now claim resources */
> + if (!request_region(nvt->cir_addr,
> + CIR_IOREG_LENGTH, NVT_DRIVER_NAME))
> + goto failure;
> +
> + if (request_irq(nvt->cir_irq, nvt_cir_isr, IRQF_SHARED,
> + NVT_DRIVER_NAME, (void *)nvt))
> + goto failure;
> +
> + if (!request_region(nvt->cir_wake_addr,
> + CIR_IOREG_LENGTH, NVT_DRIVER_NAME))
> + goto failure;
> +
> + if (request_irq(nvt->cir_wake_irq, nvt_cir_wake_isr, IRQF_SHARED,
> + NVT_DRIVER_NAME, (void *)nvt))
> + goto failure;
> +
> ret = rc_register_device(rdev);
> if (ret)
> goto failure;
> diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c
> index b09c5fa..8e88c96 100644
> --- a/drivers/media/rc/winbond-cir.c
> +++ b/drivers/media/rc/winbond-cir.c
> @@ -991,35 +991,6 @@ wbcir_probe(struct pnp_dev *device, const struct pnp_device_id *dev_id)
> "(w: 0x%lX, e: 0x%lX, s: 0x%lX, i: %u)\n",
> data->wbase, data->ebase, data->sbase, data->irq);
>
> - if (!request_region(data->wbase, WAKEUP_IOMEM_LEN, DRVNAME)) {
> - dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
> - data->wbase, data->wbase + WAKEUP_IOMEM_LEN - 1);
> - err = -EBUSY;
> - goto exit_free_data;
> - }
> -
> - if (!request_region(data->ebase, EHFUNC_IOMEM_LEN, DRVNAME)) {
> - dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
> - data->ebase, data->ebase + EHFUNC_IOMEM_LEN - 1);
> - err = -EBUSY;
> - goto exit_release_wbase;
> - }
> -
> - if (!request_region(data->sbase, SP_IOMEM_LEN, DRVNAME)) {
> - dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
> - data->sbase, data->sbase + SP_IOMEM_LEN - 1);
> - err = -EBUSY;
> - goto exit_release_ebase;
> - }
> -
> - err = request_irq(data->irq, wbcir_irq_handler,
> - IRQF_DISABLED, DRVNAME, device);
> - if (err) {
> - dev_err(dev, "Failed to claim IRQ %u\n", data->irq);
> - err = -EBUSY;
> - goto exit_release_sbase;
> - }
> -
> led_trigger_register_simple("cir-tx", &data->txtrigger);
> if (!data->txtrigger) {
> err = -ENOMEM;
> @@ -1061,6 +1032,35 @@ wbcir_probe(struct pnp_dev *device, const struct pnp_device_id *dev_id)
> data->dev->priv = data;
> data->dev->dev.parent = &device->dev;
>
> + if (!request_region(data->wbase, WAKEUP_IOMEM_LEN, DRVNAME)) {
> + dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
> + data->wbase, data->wbase + WAKEUP_IOMEM_LEN - 1);
> + err = -EBUSY;
> + goto exit_free_data;
> + }
> +
> + if (!request_region(data->ebase, EHFUNC_IOMEM_LEN, DRVNAME)) {
> + dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
> + data->ebase, data->ebase + EHFUNC_IOMEM_LEN - 1);
> + err = -EBUSY;
> + goto exit_release_wbase;
> + }
> +
> + if (!request_region(data->sbase, SP_IOMEM_LEN, DRVNAME)) {
> + dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
> + data->sbase, data->sbase + SP_IOMEM_LEN - 1);
> + err = -EBUSY;
> + goto exit_release_ebase;
> + }
> +
> + err = request_irq(data->irq, wbcir_irq_handler,
> + IRQF_DISABLED, DRVNAME, device);
> + if (err) {
> + dev_err(dev, "Failed to claim IRQ %u\n", data->irq);
> + err = -EBUSY;
> + goto exit_release_sbase;
> + }
> +
> err = rc_register_device(data->dev);
> if (err)
> goto exit_free_rc;
> --
> 1.7.9.5
>
--
Jarod Wilson
jarod@...hat.com
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