diff options
| author | Ondrej Zary <linux@rainbow-software.org> | 2016-12-05 01:07:19 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-12-08 16:56:41 -0500 |
| commit | 89fa9b5cb08c9d8ad709415b88395be463eceeee (patch) | |
| tree | 6f81312bb1202e6ef755c901a738adce24addf40 /drivers/scsi/g_NCR5380.c | |
| parent | f5b893c947151d424a4ab55ea3a8544b81974b31 (diff) | |
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.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c index de5147a8c959..76e37455480e 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; |