linux-kernel - [PATCH AUTOSEL 4.19 081/205] mtd: rawnand: fsl_ifc: check result of SRAM initialization

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Date:   Fri,  8 Nov 2019 06:35:48 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kurt Kanzenbach <kurt@...utronix.de>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Sasha Levin <sashal@...nel.org>, linux-mtd@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 081/205] mtd: rawnand: fsl_ifc: check result of SRAM initialization

From: Kurt Kanzenbach <kurt@...utronix.de>

[ Upstream commit 434655af6a187129d8114640443b27d2cecfb979 ]

The SRAM initialization might fail. If that happens further NAND operations
won't be successful. Therefore, the chip init routine should fail if the SRAM
initialization didn't work.

Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mtd/nand/raw/fsl_ifc_nand.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/fsl_ifc_nand.c b/drivers/mtd/nand/raw/fsl_ifc_nand.c
index 24f59d0066afd..e4f5792dc5893 100644
--- a/drivers/mtd/nand/raw/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/raw/fsl_ifc_nand.c
@@ -761,7 +761,7 @@ static const struct nand_controller_ops fsl_ifc_controller_ops = {
 	.attach_chip = fsl_ifc_attach_chip,
 };
 
-static void fsl_ifc_sram_init(struct fsl_ifc_mtd *priv)
+static int fsl_ifc_sram_init(struct fsl_ifc_mtd *priv)
 {
 	struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 	struct fsl_ifc_runtime __iomem *ifc_runtime = ctrl->rregs;
@@ -805,12 +805,16 @@ static void fsl_ifc_sram_init(struct fsl_ifc_mtd *priv)
 	wait_event_timeout(ctrl->nand_wait, ctrl->nand_stat,
 			   msecs_to_jiffies(IFC_TIMEOUT_MSECS));
 
-	if (ctrl->nand_stat != IFC_NAND_EVTER_STAT_OPC)
+	if (ctrl->nand_stat != IFC_NAND_EVTER_STAT_OPC) {
 		pr_err("fsl-ifc: Failed to Initialise SRAM\n");
+		return -ETIMEDOUT;
+	}
 
 	/* Restore CSOR and CSOR_ext */
 	ifc_out32(csor, &ifc_global->csor_cs[cs].csor);
 	ifc_out32(csor_ext, &ifc_global->csor_cs[cs].csor_ext);
+
+	return 0;
 }
 
 static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
@@ -914,8 +918,13 @@ static int fsl_ifc_chip_init(struct fsl_ifc_mtd *priv)
 		chip->ecc.algo = NAND_ECC_HAMMING;
 	}
 
-	if (ctrl->version >= FSL_IFC_VERSION_1_1_0)
-		fsl_ifc_sram_init(priv);
+	if (ctrl->version >= FSL_IFC_VERSION_1_1_0) {
+		int ret;
+
+		ret = fsl_ifc_sram_init(priv);
+		if (ret)
+			return ret;
+	}
 
 	/*
 	 * As IFC version 2.0.0 has 16KB of internal SRAM as compared to older
-- 
2.20.1