Messages in this thread |  | | From | Geert Uytterhoeven <> | Date | Wed, 16 Aug 2017 16:51:33 +0200 | Subject | Re: [PATCH v3 1/4] i2c: add helpers to ease DMA handling |
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Hi Wolfram,
On Tue, Jul 18, 2017 at 12:23 PM, Wolfram Sang <wsa+renesas@sang-engineering.com> wrote: > One helper checks if DMA is suitable and optionally creates a bounce > buffer, if not. The other function returns the bounce buffer and makes > sure the data is properly copied back to the message. > > Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> > --- > Changes since v2: > > * rebased to v4.13-rc1 > * helper functions are not inlined anymore but moved to i2c core > * __must_check has been added to the buffer check helper > * the release function has been renamed to contain 'dma' as well
Right:
drivers/i2c/i2c-core-base.c:2310:15: error: 'i2c_release_bounce_buf' undeclared here (not in a function) EXPORT_SYMBOL_GPL(i2c_release_bounce_buf);
> --- a/drivers/i2c/i2c-core-base.c > +++ b/drivers/i2c/i2c-core-base.c
> +/** > + * i2c_release_bounce_buf - copy data back from bounce buffer and release it ^^^^^^^^^^^^^^^^^^^^^^ > + * @msg: the message to be copied back to > + * @bounce_buf: the bounce buffer obtained from i2c_check_msg_for_dma(). > + * May be NULL. > + */ > +void i2c_release_dma_bounce_buf(struct i2c_msg *msg, u8 *bounce_buf) > +{ > + if (!bounce_buf) > + return; > + > + if (msg->flags & I2C_M_RD) > + memcpy(msg->buf, bounce_buf, msg->len); > + > + kfree(bounce_buf); > +} > +EXPORT_SYMBOL_GPL(i2c_release_bounce_buf); ^^^^^^^^^^^^^^^^^^^^^^
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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