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authorOndrej Zary <linux@rainbow-software.org>2016-12-05 01:07:19 -0500
committerMartin K. Petersen <martin.petersen@oracle.com>2016-12-08 16:56:41 -0500
commit89fa9b5cb08c9d8ad709415b88395be463eceeee (patch)
tree6f81312bb1202e6ef755c901a738adce24addf40 /drivers/scsi/g_NCR5380.c
parentf5b893c947151d424a4ab55ea3a8544b81974b31 (diff)
downloadop-kernel-dev-89fa9b5cb08c9d8ad709415b88395be463eceeee.zip
op-kernel-dev-89fa9b5cb08c9d8ad709415b88395be463eceeee.tar.gz
scsi: g_NCR5380: Check for chip presence before calling NCR5380_init()
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>
Diffstat (limited to 'drivers/scsi/g_NCR5380.c')
-rw-r--r--drivers/scsi/g_NCR5380.c7
1 files changed, 7 insertions, 0 deletions
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;
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