linux-kernel - [PATCH 4.4 08/88] mmc: core: Reset HPI enabled state during re-init and in case of errors

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Message-Id: <20190111131047.531010258@linuxfoundation.org>
Date:   Fri, 11 Jan 2019 15:07:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.4 08/88] mmc: core: Reset HPI enabled state during re-init and in case of errors

4.4-stable 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")
Cc: <stable@...r.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
@@ -1608,9 +1608,11 @@ static int mmc_init_card(struct mmc_host
 		if (err) {
 			pr_warn("%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;
+		}
 	}
 
 	/*