linux-kernel - [PATCH v2] ata: sata_mv: Fix the error handling of mv_chip

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Message-Id: <1634893946-16195-1-git-send-email-zheyuma97@gmail.com>
Date:   Fri, 22 Oct 2021 09:12:26 +0000
From:   Zheyu Ma <zheyuma97@...il.com>
To:     damien.lemoal@...nsource.wdc.com
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zheyu Ma <zheyuma97@...il.com>
Subject: [PATCH v2] ata: sata_mv: Fix the error handling of mv_chip_id()

mv_init_host() propagates the value returned by mv_chip_id() which in turn
gets propagated by mv_pci_init_one() and hits local_pci_probe().

During the process of driver probing, the probe function should return < 0
for failure, otherwise, the kernel will treat value > 0 as success.

Since this is a bug rather than a recoverable runtime error we should
use dev_alert() instead of dev_err().

Signed-off-by: Zheyu Ma <zheyuma97@...il.com>
---
Changes in v2:
    - Change the error code
    - Change the logging function
---
 drivers/ata/sata_mv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 9d86203e1e7a..c53633d47bfb 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -3896,8 +3896,8 @@ static int mv_chip_id(struct ata_host *host, unsigned int board_idx)
 		break;
 
 	default:
-		dev_err(host->dev, "BUG: invalid board index %u\n", board_idx);
-		return 1;
+		dev_alert(host->dev, "BUG: invalid board index %u\n", board_idx);
+		return -EINVAL;
 	}
 
 	hpriv->hp_flags = hp_flags;
-- 
2.17.6