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authorMarc Pignat <marc.pignat@hevs.ch>2007-12-05 02:45:10 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-12-05 12:21:18 -0500
commit9b938b749065d6a94172ac24d9748bd66a03da4c (patch)
treed5f3540224235751a492c8be8003c331263fe51a /drivers/spi/spi.c
parent3f86f14c0fc9fdb0984e64209df2f47895a07151 (diff)
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/spi.c')
-rw-r--r--drivers/spi/spi.c13
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)
541 * Also, the caller is guaranteeing that the memory associated with the 541 * Also, the caller is guaranteeing that the memory associated with the
542 * message will not be freed before this call returns. 542 * message will not be freed before this call returns.
543 * 543 *
544 * The return value is a negative error code if the message could not be 544 * It returns zero on success, else a negative error code.
545 * submitted, else zero. When the value is zero, then message->status is
546 * also defined; it's the completion code for the transfer, either zero
547 * or a negative error code from the controller driver.
548 */ 545 */
549int spi_sync(struct spi_device *spi, struct spi_message *message) 546int spi_sync(struct spi_device *spi, struct spi_message *message)
550{ 547{
@@ -554,8 +551,10 @@ int spi_sync(struct spi_device *spi, struct spi_message *message)
554 message->complete = spi_complete; 551 message->complete = spi_complete;
555 message->context = &done; 552 message->context = &done;
556 status = spi_async(spi, message); 553 status = spi_async(spi, message);
557 if (status == 0) 554 if (status == 0) {
558 wait_for_completion(&done); 555 wait_for_completion(&done);
556 status = message->status;
557 }
559 message->context = NULL; 558 message->context = NULL;
560 return status; 559 return status;
561} 560}
@@ -628,10 +627,8 @@ int spi_write_then_read(struct spi_device *spi,
628 627
629 /* do the i/o */ 628 /* do the i/o */
630 status = spi_sync(spi, &message); 629 status = spi_sync(spi, &message);
631 if (status == 0) { 630 if (status == 0)
632 memcpy(rxbuf, x[1].rx_buf, n_rx); 631 memcpy(rxbuf, x[1].rx_buf, n_rx);
633 status = message.status;
634 }
635 632
636 if (x[0].tx_buf == buf) 633 if (x[0].tx_buf == buf)
637 mutex_unlock(&lock); 634 mutex_unlock(&lock);