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