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misc: pvpanic: Check devm_ioport_map() for NULL

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Inconveniently devm_ioport_map() and devm_ioremap_resource()
return errors differently, i.e. former uses simply NULL pointer,
while the latter an error pointer.

Due to this, we have to check each of them separately.

Fixes: f104060813 ("misc: pvpanic: Combine ACPI and platform drivers")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20201228184313.57610-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2020-12-28 20:43:13 +02:00 committed by Greg Kroah-Hartman
parent b8b54ad96e
commit afded6d83a
1 changed files with 15 additions and 4 deletions
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19
drivers/misc/pvpanic.c
View file

@ -55,12 +55,23 @@ static int pvpanic_mmio_probe(struct platform_device *pdev)
struct resource *res;
res = platform_get_mem_or_io(pdev, 0);
if (res && resource_type(res) == IORESOURCE_IO)
if (!res)
return -EINVAL;
switch (resource_type(res)) {
case IORESOURCE_IO:
base = devm_ioport_map(dev, res->start, resource_size(res));
else
if (!base)
return -ENOMEM;
break;
case IORESOURCE_MEM:
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
if (IS_ERR(base))
return PTR_ERR(base);
break;
default:
return -EINVAL;
}
atomic_notifier_chain_register(&panic_notifier_list,
&pvpanic_panic_nb);