mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-09 21:41:53 +02:00
40 lines
1.6 KiB
Diff
40 lines
1.6 KiB
Diff
|
From 7dfd2bd70228d1f8d468d58cb3d12ecd618479ed Mon Sep 17 00:00:00 2001
|
||
|
|
From: Shubhrajyoti D <shubhrajyoti@ti.com>
|
||
|
|
Date: Thu, 10 May 2012 19:20:41 +0530
|
||
|
|
Subject: [PATCH] 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>
|
||
|
|
---
|
||
|
|
drivers/spi/spi.c | 4 ++--
|
||
|
|
1 files changed, 2 insertions(+), 2 deletions(-)
|
||
|
|
|
||
|
|
--- a/drivers/spi/spi.c
|
||
|
|
+++ b/drivers/spi/spi.c
|
||
|
|
@@ -530,7 +530,7 @@ static void spi_pump_messages(struct kth
|
||
|
|
/* 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) {
|
||
|
|
dev_err(&master->dev,
|
||
|
|
@@ -559,7 +559,7 @@ static void spi_pump_messages(struct kth
|
||
|
|
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,
|