diff options
author | Axel Lin <axel.lin@ingics.com> | 2013-09-10 09:43:41 +0200 |
---|---|---|
committer | Mark Brown <broonie@linaro.org> | 2013-09-17 13:56:14 +0200 |
commit | 94c69f765f1b4a658d96905ec59928e3e3e07e6a (patch) | |
tree | cfa1fffd3906bff17eed2e9771f2c33fd55877af /drivers/spi/spi-sirf.c | |
parent | Linux 3.12-rc1 (diff) | |
download | linux-94c69f765f1b4a658d96905ec59928e3e3e07e6a.tar.xz linux-94c69f765f1b4a658d96905ec59928e3e3e07e6a.zip |
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-sirf.c')
-rw-r--r-- | drivers/spi/spi-sirf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c index a1f21b747733..592b4aff651f 100644 --- a/drivers/spi/spi-sirf.c +++ b/drivers/spi/spi-sirf.c @@ -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; |