linux-kernel - [PATCH 5/5] mmc: cavium: Fix probing race with regulator

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Message-Id: <20170516093655.17746-6-jglauber@cavium.com>
Date:   Tue, 16 May 2017 11:36:55 +0200
From:   Jan Glauber <jglauber@...ium.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     David Daney <david.daney@...ium.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        "Steven J . Hill" <Steven.Hill@...ium.com>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jan Glauber <jglauber@...ium.com>
Subject: [PATCH 5/5] mmc: cavium: Fix probing race with regulator

If the regulator probing is not yet finished this driver
might catch a -EPROBE_DEFER. Returning after this condition
did not remove the created platform device. On a repeated
call to the probe function the of_platform_device_create
fails.

Calling of_platform_device_destroy after EPROBE_DEFER resolves
this bug.

Signed-off-by: Jan Glauber <jglauber@...ium.com>
---
 drivers/mmc/host/cavium-thunderx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/cavium-thunderx.c b/drivers/mmc/host/cavium-thunderx.c
index fe3d772..257535e 100644
--- a/drivers/mmc/host/cavium-thunderx.c
+++ b/drivers/mmc/host/cavium-thunderx.c
@@ -137,8 +137,10 @@ static int thunder_mmc_probe(struct pci_dev *pdev,
 				continue;
 
 			ret = cvm_mmc_of_slot_probe(&host->slot_pdev[i]->dev, host);
-			if (ret)
+			if (ret) {
+				of_platform_device_destroy(&host->slot_pdev[i]->dev, NULL);
 				goto error;
+			}
 		}
 		i++;
 	}
-- 
2.9.0.rc0.21.g7777322