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Date: Thu, 31 Mar 2011 17:05:22 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Andres Salomon <dilinger@...ued.net>
Cc: Samuel Ortiz <sameo@...ux.intel.com>, linux-kernel@...r.kernel.org,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
khali@...ux-fr.org, ben-linux@...ff.org,
Peter Korsgaard <jacmet@...site.dk>,
Mauro Carvalho Chehab <mchehab@...radead.org>,
David Brownell <dbrownell@...rs.sourceforge.net>,
linux-i2c@...r.kernel.org, linux-media@...r.kernel.org,
netdev@...r.kernel.org, spi-devel-general@...ts.sourceforge.net,
Mocean Laboratories <info@...ean-labs.com>
Subject: Re: [PATCH 07/19] timberdale: mfd_cell is now implicitly available
to drivers
On Wed, Feb 02, 2011 at 08:08:12PM -0800, Andres Salomon wrote:
>
> No need to explicitly set the cell's platform_data/data_size.
>
> In this case, move the various platform_data pointers
> to driver_data. All of the clients which make use of it
> are also changed.
>
> Signed-off-by: Andres Salomon <dilinger@...ued.net>
> ---
> drivers/dma/timb_dma.c | 2 +-
> drivers/gpio/timbgpio.c | 5 +-
> drivers/i2c/busses/i2c-ocores.c | 2 +-
> drivers/i2c/busses/i2c-xiic.c | 2 +-
> drivers/media/radio/radio-timb.c | 2 +-
> drivers/media/video/timblogiw.c | 2 +-
> drivers/mfd/timberdale.c | 81 +++++++++++++-------------------------
> drivers/net/ks8842.c | 2 +-
> drivers/spi/xilinx_spi.c | 2 +-
> 9 files changed, 36 insertions(+), 64 deletions(-)
>
> diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c
> index 3b88a4e..aa06ca4 100644
> --- a/drivers/dma/timb_dma.c
> +++ b/drivers/dma/timb_dma.c
> @@ -684,7 +684,7 @@ static irqreturn_t td_irq(int irq, void *devid)
>
> static int __devinit td_probe(struct platform_device *pdev)
> {
> - struct timb_dma_platform_data *pdata = pdev->dev.platform_data;
> + struct timb_dma_platform_data *pdata = platform_get_drvdata(pdev);
Hold the phone. I know this has already been merged, but this isn't correct.
drvdata is under the ownership of the driver, which means it should
*not* be set when .probe() gets called. It is for driver private data
to do with as it needs, usually for internal state.
Gah. Not all devices instantiated via mfd will be an mfd device,
which means that the driver may very well expect an *entirely
different* platform_device pointer; which further means a very high
potential of incorrectly dereferenced structures (as evidenced by a
patch series that is not bisectable). For instance, the xilinx ip
cores are used by more than just mfd.
This is really bad. Since this is new in .39-rc1, I really think this
series needs to be reverted. Samuel, can you look at this please?
g.
> struct timb_dma *td;
> struct resource *iomem;
> int irq;
> diff --git a/drivers/gpio/timbgpio.c b/drivers/gpio/timbgpio.c
> index 58c8f30..e404487 100644
> --- a/drivers/gpio/timbgpio.c
> +++ b/drivers/gpio/timbgpio.c
> @@ -228,7 +228,7 @@ static int __devinit timbgpio_probe(struct platform_device *pdev)
> struct gpio_chip *gc;
> struct timbgpio *tgpio;
> struct resource *iomem;
> - struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
> + struct timbgpio_platform_data *pdata = platform_get_drvdata(pdev);
> int irq = platform_get_irq(pdev, 0);
>
> if (!pdata || pdata->nr_pins > 32) {
> @@ -319,14 +319,13 @@ err_mem:
> static int __devexit timbgpio_remove(struct platform_device *pdev)
> {
> int err;
> - struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
> struct timbgpio *tgpio = platform_get_drvdata(pdev);
> struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> int irq = platform_get_irq(pdev, 0);
>
> if (irq >= 0 && tgpio->irq_base > 0) {
> int i;
> - for (i = 0; i < pdata->nr_pins; i++) {
> + for (i = 0; i < tgpio->gpio.ngpio; i++) {
> set_irq_chip(tgpio->irq_base + i, NULL);
> set_irq_chip_data(tgpio->irq_base + i, NULL);
> }
> diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
> index ef3bcb1..dc203ec 100644
> --- a/drivers/i2c/busses/i2c-ocores.c
> +++ b/drivers/i2c/busses/i2c-ocores.c
> @@ -305,7 +305,7 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
> return -EIO;
> }
>
> - pdata = pdev->dev.platform_data;
> + pdata = platform_get_drvdata(pdev);
> if (pdata) {
> i2c->regstep = pdata->regstep;
> i2c->clock_khz = pdata->clock_khz;
> diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
> index a9c419e..830b8c1 100644
> --- a/drivers/i2c/busses/i2c-xiic.c
> +++ b/drivers/i2c/busses/i2c-xiic.c
> @@ -704,7 +704,7 @@ static int __devinit xiic_i2c_probe(struct platform_device *pdev)
> if (irq < 0)
> goto resource_missing;
>
> - pdata = (struct xiic_i2c_platform_data *) pdev->dev.platform_data;
> + pdata = platform_get_drvdata(pdev);
> if (!pdata)
> return -EINVAL;
>
> diff --git a/drivers/media/radio/radio-timb.c b/drivers/media/radio/radio-timb.c
> index a185610..e7baf26 100644
> --- a/drivers/media/radio/radio-timb.c
> +++ b/drivers/media/radio/radio-timb.c
> @@ -148,7 +148,7 @@ static const struct v4l2_file_operations timbradio_fops = {
>
> static int __devinit timbradio_probe(struct platform_device *pdev)
> {
> - struct timb_radio_platform_data *pdata = pdev->dev.platform_data;
> + struct timb_radio_platform_data *pdata = platform_get_drvdata(pdev);
> struct timbradio *tr;
> int err;
>
> diff --git a/drivers/media/video/timblogiw.c b/drivers/media/video/timblogiw.c
> index fc611eb..61aa67a 100644
> --- a/drivers/media/video/timblogiw.c
> +++ b/drivers/media/video/timblogiw.c
> @@ -790,7 +790,7 @@ static int __devinit timblogiw_probe(struct platform_device *pdev)
> {
> int err;
> struct timblogiw *lw = NULL;
> - struct timb_video_platform_data *pdata = pdev->dev.platform_data;
> + struct timb_video_platform_data *pdata = platform_get_drvdata(pdev);
>
> if (!pdata) {
> dev_err(&pdev->dev, "No platform data\n");
> diff --git a/drivers/mfd/timberdale.c b/drivers/mfd/timberdale.c
> index 6ad8a7f..e9ae162 100644
> --- a/drivers/mfd/timberdale.c
> +++ b/drivers/mfd/timberdale.c
> @@ -384,8 +384,7 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg0[] = {
> .name = "timb-dma",
> .num_resources = ARRAY_SIZE(timberdale_dma_resources),
> .resources = timberdale_dma_resources,
> - .platform_data = &timb_dma_platform_data,
> - .data_size = sizeof(timb_dma_platform_data),
> + .driver_data = &timb_dma_platform_data,
> },
> {
> .name = "timb-uart",
> @@ -396,43 +395,37 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg0[] = {
> .name = "xiic-i2c",
> .num_resources = ARRAY_SIZE(timberdale_xiic_resources),
> .resources = timberdale_xiic_resources,
> - .platform_data = &timberdale_xiic_platform_data,
> - .data_size = sizeof(timberdale_xiic_platform_data),
> + .driver_data = &timberdale_xiic_platform_data,
> },
> {
> .name = "timb-gpio",
> .num_resources = ARRAY_SIZE(timberdale_gpio_resources),
> .resources = timberdale_gpio_resources,
> - .platform_data = &timberdale_gpio_platform_data,
> - .data_size = sizeof(timberdale_gpio_platform_data),
> + .driver_data = &timberdale_gpio_platform_data,
> },
> {
> .name = "timb-video",
> .num_resources = ARRAY_SIZE(timberdale_video_resources),
> .resources = timberdale_video_resources,
> - .platform_data = &timberdale_video_platform_data,
> - .data_size = sizeof(timberdale_video_platform_data),
> + .driver_data = &timberdale_video_platform_data,
> },
> {
> .name = "timb-radio",
> .num_resources = ARRAY_SIZE(timberdale_radio_resources),
> .resources = timberdale_radio_resources,
> - .platform_data = &timberdale_radio_platform_data,
> - .data_size = sizeof(timberdale_radio_platform_data),
> + .driver_data = &timberdale_radio_platform_data,
> },
> {
> .name = "xilinx_spi",
> .num_resources = ARRAY_SIZE(timberdale_spi_resources),
> .resources = timberdale_spi_resources,
> - .platform_data = &timberdale_xspi_platform_data,
> - .data_size = sizeof(timberdale_xspi_platform_data),
> + .driver_data = &timberdale_xspi_platform_data,
> },
> {
> .name = "ks8842",
> .num_resources = ARRAY_SIZE(timberdale_eth_resources),
> .resources = timberdale_eth_resources,
> - .platform_data = &timberdale_ks8842_platform_data,
> - .data_size = sizeof(timberdale_ks8842_platform_data)
> + .driver_data = &timberdale_ks8842_platform_data,
> },
> };
>
> @@ -441,8 +434,7 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg1[] = {
> .name = "timb-dma",
> .num_resources = ARRAY_SIZE(timberdale_dma_resources),
> .resources = timberdale_dma_resources,
> - .platform_data = &timb_dma_platform_data,
> - .data_size = sizeof(timb_dma_platform_data),
> + .driver_data = &timb_dma_platform_data,
> },
> {
> .name = "timb-uart",
> @@ -458,15 +450,13 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg1[] = {
> .name = "xiic-i2c",
> .num_resources = ARRAY_SIZE(timberdale_xiic_resources),
> .resources = timberdale_xiic_resources,
> - .platform_data = &timberdale_xiic_platform_data,
> - .data_size = sizeof(timberdale_xiic_platform_data),
> + .driver_data = &timberdale_xiic_platform_data,
> },
> {
> .name = "timb-gpio",
> .num_resources = ARRAY_SIZE(timberdale_gpio_resources),
> .resources = timberdale_gpio_resources,
> - .platform_data = &timberdale_gpio_platform_data,
> - .data_size = sizeof(timberdale_gpio_platform_data),
> + .driver_data = &timberdale_gpio_platform_data,
> },
> {
> .name = "timb-mlogicore",
> @@ -477,29 +467,25 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg1[] = {
> .name = "timb-video",
> .num_resources = ARRAY_SIZE(timberdale_video_resources),
> .resources = timberdale_video_resources,
> - .platform_data = &timberdale_video_platform_data,
> - .data_size = sizeof(timberdale_video_platform_data),
> + .driver_data = &timberdale_video_platform_data,
> },
> {
> .name = "timb-radio",
> .num_resources = ARRAY_SIZE(timberdale_radio_resources),
> .resources = timberdale_radio_resources,
> - .platform_data = &timberdale_radio_platform_data,
> - .data_size = sizeof(timberdale_radio_platform_data),
> + .driver_data = &timberdale_radio_platform_data,
> },
> {
> .name = "xilinx_spi",
> .num_resources = ARRAY_SIZE(timberdale_spi_resources),
> .resources = timberdale_spi_resources,
> - .platform_data = &timberdale_xspi_platform_data,
> - .data_size = sizeof(timberdale_xspi_platform_data),
> + .driver_data = &timberdale_xspi_platform_data,
> },
> {
> .name = "ks8842",
> .num_resources = ARRAY_SIZE(timberdale_eth_resources),
> .resources = timberdale_eth_resources,
> - .platform_data = &timberdale_ks8842_platform_data,
> - .data_size = sizeof(timberdale_ks8842_platform_data)
> + .driver_data = &timberdale_ks8842_platform_data,
> },
> };
>
> @@ -508,8 +494,7 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg2[] = {
> .name = "timb-dma",
> .num_resources = ARRAY_SIZE(timberdale_dma_resources),
> .resources = timberdale_dma_resources,
> - .platform_data = &timb_dma_platform_data,
> - .data_size = sizeof(timb_dma_platform_data),
> + .driver_data = &timb_dma_platform_data,
> },
> {
> .name = "timb-uart",
> @@ -520,36 +505,31 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg2[] = {
> .name = "xiic-i2c",
> .num_resources = ARRAY_SIZE(timberdale_xiic_resources),
> .resources = timberdale_xiic_resources,
> - .platform_data = &timberdale_xiic_platform_data,
> - .data_size = sizeof(timberdale_xiic_platform_data),
> + .driver_data = &timberdale_xiic_platform_data,
> },
> {
> .name = "timb-gpio",
> .num_resources = ARRAY_SIZE(timberdale_gpio_resources),
> .resources = timberdale_gpio_resources,
> - .platform_data = &timberdale_gpio_platform_data,
> - .data_size = sizeof(timberdale_gpio_platform_data),
> + .driver_data = &timberdale_gpio_platform_data,
> },
> {
> .name = "timb-video",
> .num_resources = ARRAY_SIZE(timberdale_video_resources),
> .resources = timberdale_video_resources,
> - .platform_data = &timberdale_video_platform_data,
> - .data_size = sizeof(timberdale_video_platform_data),
> + .driver_data = &timberdale_video_platform_data,
> },
> {
> .name = "timb-radio",
> .num_resources = ARRAY_SIZE(timberdale_radio_resources),
> .resources = timberdale_radio_resources,
> - .platform_data = &timberdale_radio_platform_data,
> - .data_size = sizeof(timberdale_radio_platform_data),
> + .driver_data = &timberdale_radio_platform_data,
> },
> {
> .name = "xilinx_spi",
> .num_resources = ARRAY_SIZE(timberdale_spi_resources),
> .resources = timberdale_spi_resources,
> - .platform_data = &timberdale_xspi_platform_data,
> - .data_size = sizeof(timberdale_xspi_platform_data),
> + .driver_data = &timberdale_xspi_platform_data,
> },
> };
>
> @@ -558,8 +538,7 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg3[] = {
> .name = "timb-dma",
> .num_resources = ARRAY_SIZE(timberdale_dma_resources),
> .resources = timberdale_dma_resources,
> - .platform_data = &timb_dma_platform_data,
> - .data_size = sizeof(timb_dma_platform_data),
> + .driver_data = &timb_dma_platform_data,
> },
> {
> .name = "timb-uart",
> @@ -570,43 +549,37 @@ static __devinitdata struct mfd_cell timberdale_cells_bar0_cfg3[] = {
> .name = "ocores-i2c",
> .num_resources = ARRAY_SIZE(timberdale_ocores_resources),
> .resources = timberdale_ocores_resources,
> - .platform_data = &timberdale_ocores_platform_data,
> - .data_size = sizeof(timberdale_ocores_platform_data),
> + .driver_data = &timberdale_ocores_platform_data,
> },
> {
> .name = "timb-gpio",
> .num_resources = ARRAY_SIZE(timberdale_gpio_resources),
> .resources = timberdale_gpio_resources,
> - .platform_data = &timberdale_gpio_platform_data,
> - .data_size = sizeof(timberdale_gpio_platform_data),
> + .driver_data = &timberdale_gpio_platform_data,
> },
> {
> .name = "timb-video",
> .num_resources = ARRAY_SIZE(timberdale_video_resources),
> .resources = timberdale_video_resources,
> - .platform_data = &timberdale_video_platform_data,
> - .data_size = sizeof(timberdale_video_platform_data),
> + .driver_data = &timberdale_video_platform_data,
> },
> {
> .name = "timb-radio",
> .num_resources = ARRAY_SIZE(timberdale_radio_resources),
> .resources = timberdale_radio_resources,
> - .platform_data = &timberdale_radio_platform_data,
> - .data_size = sizeof(timberdale_radio_platform_data),
> + .driver_data = &timberdale_radio_platform_data,
> },
> {
> .name = "xilinx_spi",
> .num_resources = ARRAY_SIZE(timberdale_spi_resources),
> .resources = timberdale_spi_resources,
> - .platform_data = &timberdale_xspi_platform_data,
> - .data_size = sizeof(timberdale_xspi_platform_data),
> + .driver_data = &timberdale_xspi_platform_data,
> },
> {
> .name = "ks8842",
> .num_resources = ARRAY_SIZE(timberdale_eth_resources),
> .resources = timberdale_eth_resources,
> - .platform_data = &timberdale_ks8842_platform_data,
> - .data_size = sizeof(timberdale_ks8842_platform_data)
> + .driver_data = &timberdale_ks8842_platform_data,
> },
> };
>
> diff --git a/drivers/net/ks8842.c b/drivers/net/ks8842.c
> index 928b2b8..7f0f51f 100644
> --- a/drivers/net/ks8842.c
> +++ b/drivers/net/ks8842.c
> @@ -1145,7 +1145,7 @@ static int __devinit ks8842_probe(struct platform_device *pdev)
> struct resource *iomem;
> struct net_device *netdev;
> struct ks8842_adapter *adapter;
> - struct ks8842_platform_data *pdata = pdev->dev.platform_data;
> + struct ks8842_platform_data *pdata = platform_get_drvdata(pdev);
> u16 id;
> unsigned i;
>
> diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c
> index 7adaef6..2926dec 100644
> --- a/drivers/spi/xilinx_spi.c
> +++ b/drivers/spi/xilinx_spi.c
> @@ -474,7 +474,7 @@ static int __devinit xilinx_spi_probe(struct platform_device *dev)
> struct spi_master *master;
> u8 i;
>
> - pdata = dev->dev.platform_data;
> + pdata = platform_get_drvdata(dev);
> if (pdata) {
> num_cs = pdata->num_chipselect;
> little_endian = pdata->little_endian;
> --
> 1.7.2.3
>
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