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authorAxel Lin <axel.lin@ingics.com>2013-09-10 15:43:41 +0800
committerMark Brown <broonie@linaro.org>2013-09-17 12:56:14 +0100
commit94c69f765f1b4a658d96905ec59928e3e3e07e6a (patch)
treecfa1fffd3906bff17eed2e9771f2c33fd55877af /drivers/spi/spi-davinci.c
parent272b98c6455f00884f0350f775c5342358ebb73f (diff)
downloadlinux-94c69f765f1b4a658d96905ec59928e3e3e07e6a.tar.bz2
spi: bitbang: Let spi_bitbang_start() take a reference to master
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>
Diffstat (limited to 'drivers/spi/spi-davinci.c')
-rw-r--r--drivers/spi/spi-davinci.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index 8fbfe2483ffd..af2bb73d0168 100644
--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -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;
}