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authorShubhrajyoti D <shubhrajyoti@ti.com>2012-05-10 19:20:41 +0530
committerGrant Likely <grant.likely@secretlab.ca>2012-05-10 21:23:58 -0600
commit7dfd2bd70228d1f8d468d58cb3d12ecd618479ed (patch)
tree5388c3c8ba4907ed86e7401da969e917a4f30586 /drivers/spi/spi.c
parent6d6467ee58b4cddd34b01d642d282a353dd57ce9 (diff)
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spi: Dont call prepare/unprepare transfer if not populated
Currently the prepare/unprepare transfer are called unconditionally. The assumption is that every driver using the spi core queue infrastructure has to populate the prepare and unprepare functions. This encourages drivers to populate empty functions to prevent crashing. This patch prevents the call to prepare/unprepare if not populated. Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> [grant.likely: fix whitespace defect] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/spi.c')
-rw-r--r--drivers/spi/spi.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 37c555ec59a..2d65b1684cd 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -532,7 +532,7 @@ static void spi_pump_messages(struct kthread_work *work)
/* Lock queue and check for queue work */
spin_lock_irqsave(&master->queue_lock, flags);
if (list_empty(&master->queue) || !master->running) {
- if (master->busy) {
+ if (master->busy && master->unprepare_transfer_hardware) {
ret = master->unprepare_transfer_hardware(master);
if (ret) {
spin_unlock_irqrestore(&master->queue_lock, flags);
@@ -562,7 +562,7 @@ static void spi_pump_messages(struct kthread_work *work)
master->busy = true;
spin_unlock_irqrestore(&master->queue_lock, flags);
- if (!was_busy) {
+ if (!was_busy && master->prepare_transfer_hardware) {
ret = master->prepare_transfer_hardware(master);
if (ret) {
dev_err(&master->dev,