linux-kernel - [PATCH 3.16 288/305] mmc: core: Reset HPI enabled state during re-init and in case of errors

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Message-ID: <lsq.1549201508.992824529@decadent.org.uk>
Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Ulf Hansson" <ulf.hansson@...aro.org>
Subject: [PATCH 3.16 288/305] mmc: core: Reset HPI enabled state during
 re-init and in case of errors

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ulf Hansson <ulf.hansson@...aro.org>

commit a0741ba40a009f97c019ae7541dc61c1fdf41efb upstream.

During a re-initialization of the eMMC card, we may fail to re-enable HPI.
In these cases, that isn't properly reflected in the card->ext_csd.hpi_en
bit, as it keeps being set. This may cause following attempts to use HPI,
even if's not enabled. Let's fix this!

Fixes: eb0d8f135b67 ("mmc: core: support HPI send command")
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mmc/core/mmc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1418,9 +1418,11 @@ static int mmc_init_card(struct mmc_host
 		if (err) {
 			pr_warning("%s: Enabling HPI failed\n",
 				   mmc_hostname(card->host));
+			card->ext_csd.hpi_en = 0;
 			err = 0;
-		} else
+		} else {
 			card->ext_csd.hpi_en = 1;
+		}
 	}
 
 	/*