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40 lines
1.6 KiB
Diff
40 lines
1.6 KiB
Diff
From 7dfd2bd70228d1f8d468d58cb3d12ecd618479ed Mon Sep 17 00:00:00 2001
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From: Shubhrajyoti D <shubhrajyoti@ti.com>
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Date: Thu, 10 May 2012 19:20:41 +0530
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Subject: [PATCH] spi: Dont call prepare/unprepare transfer if not populated
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Currently the prepare/unprepare transfer are called unconditionally.
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The assumption is that every driver using the spi core queue infrastructure
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has to populate the prepare and unprepare functions. This encourages
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drivers to populate empty functions to prevent crashing.
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This patch prevents the call to prepare/unprepare if not populated.
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Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
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Acked-by: Linus Walleij <linus.walleij@linaro.org>
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[grant.likely: fix whitespace defect]
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Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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---
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drivers/spi/spi.c | 4 ++--
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1 files changed, 2 insertions(+), 2 deletions(-)
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--- a/drivers/spi/spi.c
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+++ b/drivers/spi/spi.c
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@@ -530,7 +530,7 @@ static void spi_pump_messages(struct kth
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/* Lock queue and check for queue work */
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spin_lock_irqsave(&master->queue_lock, flags);
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if (list_empty(&master->queue) || !master->running) {
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- if (master->busy) {
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+ if (master->busy && master->unprepare_transfer_hardware) {
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ret = master->unprepare_transfer_hardware(master);
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if (ret) {
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dev_err(&master->dev,
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@@ -559,7 +559,7 @@ static void spi_pump_messages(struct kth
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master->busy = true;
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spin_unlock_irqrestore(&master->queue_lock, flags);
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- if (!was_busy) {
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+ if (!was_busy && master->prepare_transfer_hardware) {
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ret = master->prepare_transfer_hardware(master);
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if (ret) {
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dev_err(&master->dev,
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