linux-kernel - [PATCH 1/1] mmc: pwrseq: Fix error code propagation in mmc_pwrseq_simple

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Date:	Mon, 13 Apr 2015 16:07:41 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Olof Johansson <olof@...om.net>,
	Doug Anderson <dianders@...omium.org>,
	Kevin Hilman <khilman@...aro.org>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Subject: [PATCH 1/1] mmc: pwrseq: Fix error code propagation in mmc_pwrseq_simple_alloc()

If the struct mmc_pwrseq_match .alloc function used to allocate a
struct mmc_pwrseq fails, the error is propagated to mmc_of_parse().

But instead of returning the error code in pwrseq, host->pwrseq is
returned which will always be 0. So mmc_of_parse() succeeds even if
the pwrseq .alloc function failed and host->pwrseq is NULL.

This makes the SDIO device to not be powered if the power sequencing
.alloc functions wants to be deferred due a missing resource because
the mmc controller driver probe did wrongly succeed.

Fixes: 0f12a0ce4ce4a ("mmc: pwrseq: simplify alloc/free hooks")
Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
---
 drivers/mmc/core/pwrseq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/core/pwrseq.c b/drivers/mmc/core/pwrseq.c
index ab2129781161..4c1d1757dbf9 100644
--- a/drivers/mmc/core/pwrseq.c
+++ b/drivers/mmc/core/pwrseq.c
@@ -73,7 +73,7 @@ int mmc_pwrseq_alloc(struct mmc_host *host)
 
 	pwrseq = match->alloc(host, &pdev->dev);
 	if (IS_ERR(pwrseq)) {
-		ret = PTR_ERR(host->pwrseq);
+		ret = PTR_ERR(pwrseq);
 		goto err;
 	}
 
-- 
2.1.4

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