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

[Grant Grundler]

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

Signed-off-by: Grant Grundler <grundler@xxxxxxxxxxxx>
---
 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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