linux-kernel - [PATCH 3/3] NCR5380: Check for chip presence in NCR5380

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Date:   Sun, 30 Oct 2016 23:40:03 +0100
From:   Ondrej Zary <linux@...nbow-software.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Finn Thain <fthain@...egraphics.com.au>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] NCR5380: Check for chip presence in NCR5380_init()

Read back MODE_REG after writing it in NCR5380_init() to check if the
chip is really there.

This prevents hang when incorrect I/O address was specified by user.

Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
---
 drivers/scsi/NCR5380.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 01c0027..ce3156d 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -495,6 +495,11 @@ static int NCR5380_init(struct Scsi_Host *instance, int flags)
 
 	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
 	NCR5380_write(MODE_REG, MR_BASE);
+	/* check if the chip is really there */
+	if (NCR5380_read(MODE_REG) != MR_BASE) {
+		NCR5380_exit(instance);
+		return -ENODEV;
+	}
 	NCR5380_write(TARGET_COMMAND_REG, 0);
 	NCR5380_write(SELECT_ENABLE_REG, 0);
 
-- 
Ondrej Zary