linux-kernel - [PATCH 5/7] mmc: core: handling polling more gracefully

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Date:	Thu, 26 Sep 2013 12:22:58 -0700
From:	Grant Grundler <grundler@...omium.org>
To:	Chris Ball <cjb@...top.org>, Ulf Hansson <ulf.hansson@...aro.org>,
	Seungwon Jeon <tgih.jun@...sung.com>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Grant Grundler <grundler@...omium.org>
Subject: [PATCH 5/7] mmc: core: handling polling more gracefully

In case threads "race" to harvest async req completions, just return.

Signed-off-by: Grant Grundler <grundler@...omium.org>
---
 drivers/mmc/core/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index deb0ee5..36cfe91 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -531,6 +531,10 @@ struct mmc_async_req *mmc_start_req(struct mmc_host *host,
 	int start_err = 0;
 	struct mmc_async_req *saved_areq = host->areq;
 
+	if (!saved_areq && !areq)
+		/* Nothing to do...some code is polling. */
+		goto set_error;
+
 	/* Prepare a new request */
 	if (areq)
 		mmc_pre_req(host, areq->mrq, !saved_areq);
-- 
1.8.4

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