linux-kernel - [PATCH 5.4 39/49] mtd: lpddr: Fix bad logic in print_drs

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Message-Id: <20201031113457.327049114@linuxfoundation.org>
Date:   Sat, 31 Oct 2020 12:35:35 +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, Joe Perches <joe@...ches.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH 5.4 39/49] mtd: lpddr: Fix bad logic in print_drs_error

From: Gustavo A. R. Silva <gustavo@...eddedor.com>

commit 1c9c02bb22684f6949d2e7ddc0a3ff364fd5a6fc upstream.

Update logic for broken test. Use a more common logging style.

It appears the logic in this function is broken for the
consecutive tests of

        if (prog_status & 0x3)
                ...
        else if (prog_status & 0x2)
                ...
        else (prog_status & 0x1)
                ...

Likely the first test should be

        if ((prog_status & 0x3) == 0x3)

Found by inspection of include files using printk.

Fixes: eb3db27507f7 ("[MTD] LPDDR PFOW definition")
Cc: stable@...r.kernel.org
Reported-by: Joe Perches <joe@...ches.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Acked-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Link: https://lore.kernel.org/linux-mtd/3fb0e29f5b601db8be2938a01d974b00c8788501.1588016644.git.gustavo@embeddedor.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/mtd/pfow.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/mtd/pfow.h
+++ b/include/linux/mtd/pfow.h
@@ -128,7 +128,7 @@ static inline void print_drs_error(unsig
 
 	if (!(dsr & DSR_AVAILABLE))
 		printk(KERN_NOTICE"DSR.15: (0) Device not Available\n");
-	if (prog_status & 0x03)
+	if ((prog_status & 0x03) == 0x03)
 		printk(KERN_NOTICE"DSR.9,8: (11) Attempt to program invalid "
 						"half with 41h command\n");
 	else if (prog_status & 0x02)