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net: dsa: sja1105: fix check on while loop exit 

The while-loop exit condition check is not correct; the
loop should continue if the returns from the function calls are
negative or the CRC status returns are invalid.  Currently it
is ignoring the returns from the function calls.  Fix this by
removing the status return checks and only break from the loop
at the very end when we know that all the success condtions have
been met.

Kudos to Dan Carpenter for describing the correct fix and
Vladimir Oltean for noting the change to the check on the number
of retries.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 8aa9ebccae ("net: dsa: Introduce driver for NXP SJA1105 5-port L2 switch")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Tested-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Colin Ian King 2019-05-08 14:30:41 +01:00 committed by David S. Miller
parent 86dc59e390
commit 5425711b6d
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/dsa/sja1105/sja1105_spi.c
View File

@ -466,14 +466,15 @@ int sja1105_static_config_upload(struct sja1105_private *priv)
"invalid, retrying...\n");
continue;
}
} while (--retries && (status.crcchkl == 1 || status.crcchkg == 1 ||
status.configs == 0 || status.ids == 1));
/* Success! */
break;
} while (--retries);
if (!retries) {
rc = -EIO;
dev_err(dev, "Failed to upload config to device, giving up\n");
goto out;
} else if (retries != RETRIES - 1) {
} else if (retries != RETRIES) {
dev_info(dev, "Succeeded after %d tried\n", RETRIES - retries);
}