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Date: Tue, 27 Oct 2015 14:29:06 -0700 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Guenter Roeck <linux@...ck-us.net>, Alexey Klimov <alexey.klimov@...aro.org>, Mark Brown <broonie@...nel.org>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 3.19.y-ckt 06/86] spi: Fix documentation of spi_alloc_master() 3.19.8-ckt9 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Guenter Roeck <linux@...ck-us.net> commit a394d635193b641f2c86ead5ada5b115d57c51f8 upstream. Actually, spi_master_put() after spi_alloc_master() must _not_ be followed by kfree(). The memory is already freed with the call to spi_master_put() through spi_master_class, which registers a release function. Calling both spi_master_put() and kfree() results in often nasty (and delayed) crashes elsewhere in the kernel, often in the networking stack. This reverts commit eb4af0f5349235df2e4a5057a72fc8962d00308a. Link to patch and concerns: https://lkml.org/lkml/2012/9/3/269 or http://lkml.iu.edu/hypermail/linux/kernel/1209.0/00790.html Alexey Klimov: This revert becomes valid after 94c69f765f1b4a658d96905ec59928e3e3e07e6a when spi-imx.c has been fixed and there is no need to call kfree() so comment for spi_alloc_master() should be fixed. Signed-off-by: Guenter Roeck <linux@...ck-us.net> Signed-off-by: Alexey Klimov <alexey.klimov@...aro.org> Signed-off-by: Mark Brown <broonie@...nel.org> Signed-off-by: Kamal Mostafa <kamal@...onical.com> --- drivers/spi/spi.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index bfa47d5..2ebe805 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1492,8 +1492,7 @@ static struct class spi_master_class = { * * The caller is responsible for assigning the bus number and initializing * the master's methods before calling spi_register_master(); and (after errors - * adding the device) calling spi_master_put() and kfree() to prevent a memory - * leak. + * adding the device) calling spi_master_put() to prevent a memory leak. */ struct spi_master *spi_alloc_master(struct device *dev, unsigned size) { -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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