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8250-men-mcb: fix error checking when get_num_ports returns -ENODEV 

The current checking for failure on the number of ports fails when
-ENODEV is returned from the call to get_num_ports. Fix this by making
num_ports and loop counter i signed rather than unsigned ints. Also
add check for num_ports being less than zero to check for -ve error
returns.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: e2fea54e45 ("8250-men-mcb: add support for 16z025 and 16z057")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Michael Moese <mmoese@suse.de>
Link: https://lore.kernel.org/r/20191013220016.9369-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Ian King 2019-10-13 23:00:16 +01:00 committed by Greg Kroah-Hartman
parent 4f5cafb5cb
commit f50b6805db
1 changed files with 4 additions and 4 deletions
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8
drivers/tty/serial/8250/8250_men_mcb.c
View File

@ -72,8 +72,8 @@ static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
{
struct serial_8250_men_mcb_data *data;
struct resource *mem;
unsigned int num_ports;
unsigned int i;
int num_ports;
int i;
void __iomem *membase;
mem = mcb_get_resource(mdev, IORESOURCE_MEM);
@ -88,7 +88,7 @@ static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
dev_dbg(&mdev->dev, "found a 16z%03u with %u ports\n",
mdev->id, num_ports);
if (num_ports == 0 || num_ports > 4) {
if (num_ports <= 0 || num_ports > 4) {
dev_err(&mdev->dev, "unexpected number of ports: %u\n",
num_ports);
return -ENODEV;
@ -133,7 +133,7 @@ static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
static void serial_8250_men_mcb_remove(struct mcb_device *mdev)
{
unsigned int num_ports, i;
int num_ports, i;
struct serial_8250_men_mcb_data *data = mcb_get_drvdata(mdev);
if (!data)