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ipmi:ssif: Improve detecting during probing

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If an IPMI SSIF device is probed and there is something there, but
probably not an actual BMC, the code would just issue a lot of errors
before it failed.  We kind of need these errors to help with certain
issues, and some of the failure reports are non-fatal.

However, a get device id command should alway work.  If that fails,
nothing else is going to work and it's a pretty good indication that
there's no valid BMC there.  So issue and check that command and bail
if it fails.

Reported-by: Ivan T. Ivanov <iivanov@suse.de>
Signed-off-by: Corey Minyard <corey@minyard.net>
This commit is contained in:
Corey Minyard 2024-08-20 19:46:47 -05:00
parent 0e38f7ecb5
commit 88f65f903d
1 changed files with 23 additions and 1 deletions
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24
drivers/char/ipmi/ipmi_ssif.c
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@ -1368,8 +1368,20 @@ static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
rv = do_cmd(client, 2, msg, &len, resp);
if (rv)
rv = -ENODEV;
else
else {
if (len < 3) {
rv = -ENODEV;
} else {
struct ipmi_device_id id;
rv = ipmi_demangle_device_id(resp[0] >> 2, resp[1],
resp + 2, len - 2, &id);
if (rv)
rv = -ENODEV; /* Error means a BMC probably isn't there. */
}
if (!rv && info)
strscpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
}
kfree(resp);
return rv;
}
@ -1704,6 +1716,16 @@ static int ssif_probe(struct i2c_client *client)
ipmi_addr_src_to_str(ssif_info->addr_source),
client->addr, client->adapter->name, slave_addr);
/*
* Send a get device id command and validate its response to
* make sure a valid BMC is there.
*/
rv = ssif_detect(client, NULL);
if (rv) {
dev_err(&client->dev, "Not present\n");
goto out;
}
/* Now check for system interface capabilities */
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;