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authorAxel Lin <axel.lin@ingics.com>2013-09-10 11:43:41 +0400
committerMark Brown <broonie@linaro.org>2013-09-17 15:56:14 +0400
commit94c69f765f1b4a658d96905ec59928e3e3e07e6a (patch)
treecfa1fffd3906bff17eed2e9771f2c33fd55877af /drivers/spi/spi-ppc4xx.c
parent272b98c6455f00884f0350f775c5342358ebb73f (diff)
downloadlinux-94c69f765f1b4a658d96905ec59928e3e3e07e6a.tar.xz
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-ppc4xx.c')
-rw-r--r--drivers/spi/spi-ppc4xx.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/spi/spi-ppc4xx.c b/drivers/spi/spi-ppc4xx.c
index 0ee53c25ba58..c57740bb70d3 100644
--- a/drivers/spi/spi-ppc4xx.c
+++ b/drivers/spi/spi-ppc4xx.c
@@ -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;
}