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| author | Hans-Peter Nilsson <hans-peter.nilsson@axis.com> | 2007-02-12 00:52:44 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-12 09:48:31 -0800 |
| commit | 7f8c7619ea1ff5ab8e0b08c8120d629834ef4253 (patch) | |
| tree | 722c72263bb4259bc787b8236673e727182dac98 /drivers/spi/spi_bitbang.c | |
| parent | ddc1e9753106cedcca7944d2b068baa2e14640b1 (diff) | |
| download | linux-7f8c7619ea1ff5ab8e0b08c8120d629834ef4253.tar.gz linux-7f8c7619ea1ff5ab8e0b08c8120d629834ef4253.tar.bz2 linux-7f8c7619ea1ff5ab8e0b08c8120d629834ef4253.zip | |
[PATCH] spi_bitbang(): use overridable setup_transfer() method
A small bug-fix for spi_bitbang: it must always call the setup_transfer
function via the overridable pointer, not assume that its
spi_bitbang_setup_transfer is sufficient. Otherwise, if all options in the
transfers are default (0), the overrided function will never be called.
Granted, the function replacing it must call spi_bitbang_setup_transfer,
but it might also have other important things to do, even if the second
argument (the spi_transfer) is NULL. Tested together with the other
patches on the spi_crisv32_sser and spi_crisv32_gpio drivers (not yet in
the kernel, will IIUC be submitted as part of the usual
arch-maintainer-pushes).
Signed-off-by: Hans-Peter Nilsson <hp@axis.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi/spi_bitbang.c')
| -rw-r--r-- | drivers/spi/spi_bitbang.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c index 57289b61d0be..a5dadc74cee6 100644 --- a/drivers/spi/spi_bitbang.c +++ b/drivers/spi/spi_bitbang.c @@ -210,7 +210,7 @@ int spi_bitbang_setup(struct spi_device *spi) if (!cs->txrx_word) return -EINVAL; - retval = spi_bitbang_setup_transfer(spi, NULL); + retval = bitbang->setup_transfer(spi, NULL); if (retval < 0) return retval; @@ -442,9 +442,10 @@ EXPORT_SYMBOL_GPL(spi_bitbang_transfer); * hardware that basically exposes a shift register) or per-spi_transfer * (which takes better advantage of hardware like fifos or DMA engines). * - * Drivers using per-word I/O loops should use (or call) spi_bitbang_setup and - * spi_bitbang_cleanup to handle those spi master methods. Those methods are - * the defaults if the bitbang->txrx_bufs routine isn't initialized. + * Drivers using per-word I/O loops should use (or call) spi_bitbang_setup, + * spi_bitbang_cleanup and spi_bitbang_setup_transfer to handle those spi + * master methods. Those methods are the defaults if the bitbang->txrx_bufs + * routine isn't initialized. * * This routine registers the spi_master, which will process requests in a * dedicated task, keeping IRQs unblocked most of the time. To stop |