mtd: rawnand: fsl_ifc: return errors for failed page reads

fsl_ifc_run_command() logs controller timeout and other non-OPC
completion states in ctrl->nand_stat. fsl_ifc_read_page() then only
increments the ECC failure counter for non-OPC status and still returns
max_bitflips, which can be zero.

Return -ETIMEDOUT when the command did not complete at all and -EIO for
other non-OPC read completions so the NAND core does not treat a failed
page read as a clean page.

Fixes: 8277188 ("NAND Machine support for Integrated Flash Controller")
Cc: stable@vger.kernel.org
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Author: neosys007

drivers/mtd/nand/raw/fsl_ifc_nand.c

@@ -684,8 +684,15 @@ static int fsl_ifc_read_page(struct nand_chip *chip, uint8_t *buf,
 		return check_erased_page(chip, buf);
 	}
 
-	if (ctrl->nand_stat != IFC_NAND_EVTER_STAT_OPC)
+	if (!ctrl->nand_stat) {
 		mtd->ecc_stats.failed++;
+		return -ETIMEDOUT;
+	}
+
+	if (ctrl->nand_stat != IFC_NAND_EVTER_STAT_OPC) {
+		mtd->ecc_stats.failed++;
+		return -EIO;
+	}
 
 	return nctrl->max_bitflips;
 }