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Subject[PATCH 1/1] mmc: pwrseq: Fix error code propagation in mmc_pwrseq_simple_alloc()
Date
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@collabora.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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