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scsi: g_NCR5380: Check for chip presence before calling NCR5380_init()

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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@rainbow-software.org>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ondrej Zary 2016-12-05 01:07:19 -05:00 committed by Martin K. Petersen
parent f5b893c947
commit 89fa9b5cb0
1 changed files with 7 additions and 0 deletions
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7
drivers/scsi/g_NCR5380.c
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@ -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); ret = NCR5380_init(instance, flags | FLAG_LATE_DMA_SETUP);
if (ret) if (ret)
goto out_unregister; goto out_unregister;