linux-kernel - [PATCH 1/4] g_NCR5380: Check for chip presence before calling NCR5380

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Date:   Mon,  5 Dec 2016 01:07:19 -0500 (EST)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Ondrej Zary <linux@...nbow-software.org>
Cc:     Michael Schmitz <schmitzmic@...il.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] g_NCR5380: Check for chip presence before calling
 NCR5380_init()

From: Ondrej Zary <linux@...nbow-software.org>

Write and read back mode register to check that a chip is really there.
If no card is present, reads result in 0xff.

Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
---
 drivers/scsi/g_NCR5380.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index de5147a..76e3745 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -248,6 +248,13 @@ static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
 		}
 	}
 
+	/* Check for vacant slot */
+	NCR5380_write(MODE_REG, 0);
+	if (NCR5380_read(MODE_REG) != 0) {
+		ret = -ENODEV;
+		goto out_unregister;
+	}
+
 	ret = NCR5380_init(instance, flags | FLAG_LATE_DMA_SETUP);
 	if (ret)
 		goto out_unregister;
-- 
2.7.3