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| author | Marc Pignat <marc.pignat@hevs.ch> | 2007-12-04 23:45:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-12-05 09:21:18 -0800 |
| commit | 9b938b749065d6a94172ac24d9748bd66a03da4c (patch) | |
| tree | d5f3540224235751a492c8be8003c331263fe51a /drivers/spi | |
| parent | 3f86f14c0fc9fdb0984e64209df2f47895a07151 (diff) | |
| download | linux-stable-9b938b749065d6a94172ac24d9748bd66a03da4c.tar.gz linux-stable-9b938b749065d6a94172ac24d9748bd66a03da4c.tar.bz2 linux-stable-9b938b749065d6a94172ac24d9748bd66a03da4c.zip | |
spi: simplify spi_sync() calling convention
Simplify spi_sync calling convention, eliminating the need to check both
the return value AND the message->status. In consequence, this corrects
misbehaviours of spi_read and spi_write (which only checked the former) and
their callers.
Signed-off-by: Marc Pignat <marc.pignat@hevs.ch>
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')
| -rw-r--r-- | drivers/spi/spi.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 6ca07c9929e6..93e9de46977a 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -541,10 +541,7 @@ static void spi_complete(void *arg) * Also, the caller is guaranteeing that the memory associated with the * message will not be freed before this call returns. * - * The return value is a negative error code if the message could not be - * submitted, else zero. When the value is zero, then message->status is - * also defined; it's the completion code for the transfer, either zero - * or a negative error code from the controller driver. + * It returns zero on success, else a negative error code. */ int spi_sync(struct spi_device *spi, struct spi_message *message) { @@ -554,8 +551,10 @@ int spi_sync(struct spi_device *spi, struct spi_message *message) message->complete = spi_complete; message->context = &done; status = spi_async(spi, message); - if (status == 0) + if (status == 0) { wait_for_completion(&done); + status = message->status; + } message->context = NULL; return status; } @@ -628,10 +627,8 @@ int spi_write_then_read(struct spi_device *spi, /* do the i/o */ status = spi_sync(spi, &message); - if (status == 0) { + if (status == 0) memcpy(rxbuf, x[1].rx_buf, n_rx); - status = message.status; - } if (x[0].tx_buf == buf) mutex_unlock(&lock); |