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spi: bitbang: Let spi_bitbang_start() take a reference to master

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Many drivers that use bitbang library have a leak on probe error paths.
This is because once a spi_master_get() call succeeds, we need an additional
spi_master_put() call to free the memory.

Fix this issue by moving the code taking a reference to master to
spi_bitbang_start(), so spi_bitbang_start() will take a reference to master on
success. With this change, the caller is responsible for calling
spi_bitbang_stop() to decrement the reference and spi_master_put() as
counterpart of spi_alloc_master() to prevent a memory leak.

So now we have below patten for drivers using bitbang library:

probe:
spi_alloc_master        -> Init reference count to 1
spi_bitbang_start       -> Increment reference count
remove:
spi_bitbang_stop        -> Decrement reference count
spi_master_put          -> Decrement reference count (reference count reaches 0)

Fixup all users accordingly.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Suggested-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Acked-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Axel Lin 2013-09-10 15:43:41 +08:00 committed by Mark Brown
parent d0e639c9e0
commit 702a4879ec
18 changed files with 33 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/spi/spi-altera.c
View File

@ -219,7 +219,7 @@ static int altera_spi_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, hw);
/* setup the state for the bitbang driver */
hw->bitbang.master = spi_master_get(master);
hw->bitbang.master = master;
if (!hw->bitbang.master)
return err;
hw->bitbang.chipselect = altera_spi_chipsel;

2
drivers/spi/spi-ath79.c
View File

@ -231,7 +231,7 @@ static int ath79_spi_probe(struct platform_device *pdev)
master->num_chipselect = pdata->num_chipselect;
}
sp->bitbang.master = spi_master_get(master);
sp->bitbang.master = master;
sp->bitbang.chipselect = ath79_spi_chipselect;
sp->bitbang.txrx_word[SPI_MODE_0] = ath79_spi_txrx_mode0;
sp->bitbang.setup_transfer = spi_bitbang_setup_transfer;

2
drivers/spi/spi-au1550.c
View File

@ -775,7 +775,7 @@ static int au1550_spi_probe(struct platform_device *pdev)
hw = spi_master_get_devdata(master);
hw->master = spi_master_get(master);
hw->master = master;
hw->pdata = dev_get_platdata(&pdev->dev);
hw->dev = &pdev->dev;

12
drivers/spi/spi-bitbang.c
View File

@ -414,10 +414,16 @@ static int spi_bitbang_unprepare_hardware(struct spi_master *spi)
* This routine registers the spi_master, which will process requests in a
* dedicated task, keeping IRQs unblocked most of the time. To stop
* processing those requests, call spi_bitbang_stop().
*
* On success, this routine will take a reference to master. The caller is
* responsible for calling spi_bitbang_stop() to decrement the reference and
* spi_master_put() as counterpart of spi_alloc_master() to prevent a memory
* leak.
*/
int spi_bitbang_start(struct spi_bitbang *bitbang)
{
struct spi_master *master = bitbang->master;
int ret;
if (!master || !bitbang->chipselect)
return -EINVAL;
@ -449,7 +455,11 @@ int spi_bitbang_start(struct spi_bitbang *bitbang)
/* driver may get busy before register() returns, especially
* if someone registered boardinfo for devices
*/
return spi_register_master(master);
ret = spi_register_master(spi_master_get(master));
if (ret)
spi_master_put(master);
return 0;
}
EXPORT_SYMBOL_GPL(spi_bitbang_start);

2
drivers/spi/spi-butterfly.c
View File

@ -225,7 +225,7 @@ static void butterfly_attach(struct parport *p)
master->bus_num = 42;
master->num_chipselect = 2;
pp->bitbang.master = spi_master_get(master);
pp->bitbang.master = master;
pp->bitbang.chipselect = butterfly_chipselect;
pp->bitbang.txrx_word[SPI_MODE_0] = butterfly_txrx_word_mode0;

10
drivers/spi/spi-davinci.c
View File

@ -916,7 +916,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
if (ret)
goto unmap_io;
dspi->bitbang.master = spi_master_get(master);
dspi->bitbang.master = master;
if (dspi->bitbang.master == NULL) {
ret = -ENODEV;
goto irq_free;
@ -925,7 +925,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
dspi->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(dspi->clk)) {
ret = -ENODEV;
goto put_master;
goto irq_free;
}
clk_prepare_enable(dspi->clk);
@ -1015,8 +1015,6 @@ free_dma:
free_clk:
clk_disable_unprepare(dspi->clk);
clk_put(dspi->clk);
put_master:
spi_master_put(master);
irq_free:
free_irq(dspi->irq, dspi);
unmap_io:
@ -1024,7 +1022,7 @@ unmap_io:
release_region:
release_mem_region(dspi->pbase, resource_size(r));
free_master:
kfree(master);
spi_master_put(master);
err:
return ret;
}
@ -1051,11 +1049,11 @@ static int davinci_spi_remove(struct platform_device *pdev)
clk_disable_unprepare(dspi->clk);
clk_put(dspi->clk);
spi_master_put(master);
free_irq(dspi->irq, dspi);
iounmap(dspi->base);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(dspi->pbase, resource_size(r));
spi_master_put(master);
return 0;
}

2
drivers/spi/spi-efm32.c
View File

@ -347,7 +347,7 @@ static int efm32_spi_probe(struct platform_device *pdev)
ddata = spi_master_get_devdata(master);
ddata->bitbang.master = spi_master_get(master);
ddata->bitbang.master = master;
ddata->bitbang.chipselect = efm32_spi_chipselect;
ddata->bitbang.setup_transfer = efm32_spi_setup_transfer;
ddata->bitbang.txrx_bufs = efm32_spi_txrx_bufs;

2
drivers/spi/spi-fsl-dspi.c
View File

@ -450,7 +450,7 @@ static int dspi_probe(struct platform_device *pdev)
dspi = spi_master_get_devdata(master);
dspi->pdev = pdev;
dspi->bitbang.master = spi_master_get(master);
dspi->bitbang.master = master;
dspi->bitbang.chipselect = dspi_chipselect;
dspi->bitbang.setup_transfer = dspi_setup_transfer;
dspi->bitbang.txrx_bufs = dspi_txrx_transfer;

5
drivers/spi/spi-gpio.c
View File

@ -467,7 +467,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
}
#endif
spi_gpio->bitbang.master = spi_master_get(master);
spi_gpio->bitbang.master = master;
spi_gpio->bitbang.chipselect = spi_gpio_chipselect;
if ((master_flags & (SPI_MASTER_NO_TX | SPI_MASTER_NO_RX)) == 0) {
@ -486,7 +486,6 @@ static int spi_gpio_probe(struct platform_device *pdev)
status = spi_bitbang_start(&spi_gpio->bitbang);
if (status < 0) {
spi_master_put(spi_gpio->bitbang.master);
gpio_free:
if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO)
gpio_free(SPI_MISO_GPIO);
@ -510,13 +509,13 @@ static int spi_gpio_remove(struct platform_device *pdev)
/* stop() unregisters child devices too */
status = spi_bitbang_stop(&spi_gpio->bitbang);
spi_master_put(spi_gpio->bitbang.master);
if (SPI_MISO_GPIO != SPI_GPIO_NO_MISO)
gpio_free(SPI_MISO_GPIO);
if (SPI_MOSI_GPIO != SPI_GPIO_NO_MOSI)
gpio_free(SPI_MOSI_GPIO);
gpio_free(SPI_SCK_GPIO);
spi_master_put(spi_gpio->bitbang.master);
return status;
}

2
drivers/spi/spi-imx.c
View File

@ -786,7 +786,7 @@ static int spi_imx_probe(struct platform_device *pdev)
master->num_chipselect = num_cs;
spi_imx = spi_master_get_devdata(master);
spi_imx->bitbang.master = spi_master_get(master);
spi_imx->bitbang.master = master;
for (i = 0; i < master->num_chipselect; i++) {
int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);

2
drivers/spi/spi-lm70llp.c
View File

@ -222,7 +222,7 @@ static void spi_lm70llp_attach(struct parport *p)
/*
* SPI and bitbang hookup.
*/
pp->bitbang.master = spi_master_get(master);
pp->bitbang.master = master;
pp->bitbang.chipselect = lm70_chipselect;
pp->bitbang.txrx_word[SPI_MODE_0] = lm70_txrx;
pp->bitbang.flags = SPI_3WIRE;

3
drivers/spi/spi-nuc900.c
View File

@ -349,7 +349,7 @@ static int nuc900_spi_probe(struct platform_device *pdev)
}
hw = spi_master_get_devdata(master);
hw->master = spi_master_get(master);
hw->master = master;
hw->pdata = dev_get_platdata(&pdev->dev);
hw->dev = &pdev->dev;
@ -435,7 +435,6 @@ err_iomap:
kfree(hw->ioarea);
err_pdata:
spi_master_put(hw->master);
err_nomem:
return err;
}

2
drivers/spi/spi-oc-tiny.c
View File

@ -306,7 +306,7 @@ static int tiny_spi_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, hw);
/* setup the state for the bitbang driver */
hw->bitbang.master = spi_master_get(master);
hw->bitbang.master = master;
if (!hw->bitbang.master)
return err;
hw->bitbang.setup_transfer = tiny_spi_setup_transfer;

3
drivers/spi/spi-ppc4xx.c
View File

@ -396,7 +396,7 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
master->dev.of_node = np;
platform_set_drvdata(op, master);
hw = spi_master_get_devdata(master);
hw->master = spi_master_get(master);
hw->master = master;
hw->dev = dev;
init_completion(&hw->done);
@ -558,6 +558,7 @@ static int spi_ppc4xx_of_remove(struct platform_device *op)
free_irq(hw->irqnum, hw);
iounmap(hw->regs);
free_gpios(hw);
spi_master_put(master);
return 0;
}

2
drivers/spi/spi-s3c24xx.c
View File

@ -524,7 +524,7 @@ static int s3c24xx_spi_probe(struct platform_device *pdev)
hw = spi_master_get_devdata(master);
memset(hw, 0, sizeof(struct s3c24xx_spi));
hw->master = spi_master_get(master);
hw->master = master;
hw->pdata = pdata = dev_get_platdata(&pdev->dev);
hw->dev = &pdev->dev;

2
drivers/spi/spi-sh-sci.c
View File

@ -133,7 +133,7 @@ static int sh_sci_spi_probe(struct platform_device *dev)
sp->info = dev_get_platdata(&dev->dev);
/* setup spi bitbang adaptor */
sp->bitbang.master = spi_master_get(master);
sp->bitbang.master = master;
sp->bitbang.master->bus_num = sp->info->bus_num;
sp->bitbang.master->num_chipselect = sp->info->num_chipselect;
sp->bitbang.chipselect = sh_sci_spi_chipselect;

2
drivers/spi/spi-sirf.c
View File

@ -632,7 +632,7 @@ static int spi_sirfsoc_probe(struct platform_device *pdev)
if (ret)
goto free_master;
sspi->bitbang.master = spi_master_get(master);
sspi->bitbang.master = master;
sspi->bitbang.chipselect = spi_sirfsoc_chipselect;
sspi->bitbang.setup_transfer = spi_sirfsoc_setup_transfer;
sspi->bitbang.txrx_bufs = spi_sirfsoc_transfer;

2
drivers/spi/spi-xilinx.c
View File

@ -372,7 +372,7 @@ static int xilinx_spi_probe(struct platform_device *pdev)
master->mode_bits = SPI_CPOL | SPI_CPHA;
xspi = spi_master_get_devdata(master);
xspi->bitbang.master = spi_master_get(master);
xspi->bitbang.master = master;
xspi->bitbang.chipselect = xilinx_spi_chipselect;
xspi->bitbang.setup_transfer = xilinx_spi_setup_transfer;
xspi->bitbang.txrx_bufs = xilinx_spi_txrx_bufs;