[PATCH] async_tx: correct reference to ASYNC_TX_ENABLE_CHANNEL_SWITCH

Commit b802c8410ca9 ("async_tx: deprecate broken support for channel
switching") in 2017 intended to "prevent async_tx from using an offload
engine if the channel switching capability is enabled" by adding a
suitable ifdef on the corresponding config.

The config for determining if  the channel switching capability is
enabled is called CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH, however
the ifdef falsely refers to CONFIG_ASYNC_TX_CHANNEL_SWITCH (note the
missing "ENABLE").

Correct the name of the config to the intended one.

Fixes: b802c8410ca9 ("async_tx: deprecate broken support for channel switching")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
---
 include/linux/async_tx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
index 5cc73d7e5b52..8c7b940d9912 100644
--- a/include/linux/async_tx.h
+++ b/include/linux/async_tx.h

@@ -74,7 +74,7 @@ struct async_submit_ctl {
 	void *scribble;
 };
 
-#if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_CHANNEL_SWITCH)
+#if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH)
 #define async_tx_issue_pending_all dma_issue_pending_all
 
 /**

-- 
2.26.2