On Mon, Sep 03, 2012 at 01:26:26PM -0700, Guenter Roeck wrote:
> 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.
>
> Cc: Uwe Kleine-Koenig <u.kleine-koe...@pengutronix.de>
> Signed-off-by: Guenter Roeck <li...@roeck-us.net>
I didn't check the callback, but I introduced
eb4af0f5349235df2e4a5057a72fc8962d00308a because I saw the kfree in
drivers/spi/spi-imx.c. So I guess this needs fixing, too?!
Best regards
Uwe
> ---
> 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 2d9b5bb..6470750 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -1082,8 +1082,7 @@ 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)
> {
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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