linux-kernel - [RFC PATCH] mtd: lpddr: Fix bad logic in print_drs

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Date:   Mon, 30 Mar 2020 12:56:59 -0700
From:   Joe Perches <joe@...ches.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-mtd@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH] mtd: lpddr: Fix bad logic in print_drs_error

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

Miscellanea:

o Coalesce formats

Signed-off-by: Joe Perches <joe@...ches.com>
---

Found by inspection of include files using printk.

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)

And this function is only used in drivers/mtd/lpddr/lpddr_cmds.c
perhaps it should be moved there.

 include/linux/mtd/pfow.h | 31 ++++++++++++++-----------------
 1 file changed, 14 insertions(+), 17 deletions(-)

diff --git a/include/linux/mtd/pfow.h b/include/linux/mtd/pfow.h
index 122f343..1c08e75 100644
--- a/include/linux/mtd/pfow.h
+++ b/include/linux/mtd/pfow.h
@@ -127,31 +127,28 @@ static inline void print_drs_error(unsigned dsr)
 	int prog_status = (dsr & DSR_RPS) >> 8;
 
 	if (!(dsr & DSR_AVAILABLE))
-		printk(KERN_NOTICE"DSR.15: (0) Device not Available\n");
-	if (prog_status & 0x03)
-		printk(KERN_NOTICE"DSR.9,8: (11) Attempt to program invalid "
-						"half with 41h command\n");
+		pr_notice("DSR.15: (0) Device not Available\n");
+
+	if ((prog_status & 0x03) == 0x03)
+		pr_notice("DSR.9,8: (11) Attempt to program invalid half with 41h command\n");
 	else if (prog_status & 0x02)
-		printk(KERN_NOTICE"DSR.9,8: (10) Object Mode Program attempt "
-					"in region with Control Mode data\n");
+		pr_notice("DSR.9,8: (10) Object Mode Program attempt in region with Control Mode data\n");
 	else if (prog_status &  0x01)
-		printk(KERN_NOTICE"DSR.9,8: (01) Program attempt in region "
-						"with Object Mode data\n");
+		pr_notice("DSR.9,8: (01) Program attempt in region with Object Mode data\n");
+
 	if (!(dsr & DSR_READY_STATUS))
-		printk(KERN_NOTICE"DSR.7: (0) Device is Busy\n");
+		pr_notice("DSR.7: (0) Device is Busy\n");
 	if (dsr & DSR_ESS)
-		printk(KERN_NOTICE"DSR.6: (1) Erase Suspended\n");
+		pr_notice("DSR.6: (1) Erase Suspended\n");
 	if (dsr & DSR_ERASE_STATUS)
-		printk(KERN_NOTICE"DSR.5: (1) Erase/Blank check error\n");
+		pr_notice("DSR.5: (1) Erase/Blank check error\n");
 	if (dsr & DSR_PROGRAM_STATUS)
-		printk(KERN_NOTICE"DSR.4: (1) Program Error\n");
+		pr_notice("DSR.4: (1) Program Error\n");
 	if (dsr & DSR_VPPS)
-		printk(KERN_NOTICE"DSR.3: (1) Vpp low detect, operation "
-					"aborted\n");
+		pr_notice("DSR.3: (1) Vpp low detect, operation aborted\n");
 	if (dsr & DSR_PSS)
-		printk(KERN_NOTICE"DSR.2: (1) Program suspended\n");
+		pr_notice("DSR.2: (1) Program suspended\n");
 	if (dsr & DSR_DPS)
-		printk(KERN_NOTICE"DSR.1: (1) Aborted Erase/Program attempt "
-					"on locked block\n");
+		pr_notice("DSR.1: (1) Aborted Erase/Program attempt on locked block\n");
 }
 #endif /* __LINUX_MTD_PFOW_H */