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classmate-laptop: should check for NULL as retval for rfkill_alloc

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rfkill_alloc returns NULL when it fails if RFKILL is enabled. When RFKILL is
disabled, its return value of ERR_PTR(-ENODEV) is OK to use as all rfkill
functions will work with it, as they are simply empty stubs.

Reported-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: platform-driver-x86@vger.kernel.org
Cc: mjg@redhat.com
Cc: don@syst.com.br
Cc: rpurdie@rpsys.net
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Thadeu Lima de Souza Cascardo 2010-06-09 16:48:39 -03:00 committed by Matthew Garrett
parent 0385e5210c
commit b95d13eaf3
1 changed files with 6 additions and 5 deletions
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11
drivers/platform/x86/classmate-laptop.c
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@ -573,16 +573,17 @@ static int cmpc_ipml_add(struct acpi_device *acpi)
ipml->rf = rfkill_alloc("cmpc_rfkill", &acpi->dev, RFKILL_TYPE_WLAN,
&cmpc_rfkill_ops, acpi->handle);
/* rfkill_alloc may fail if RFKILL is disabled. We should still work
* anyway. */
if (!IS_ERR(ipml->rf)) {
/*
* If RFKILL is disabled, rfkill_alloc will return ERR_PTR(-ENODEV).
* This is OK, however, since all other uses of the device will not
* derefence it.
*/
if (ipml->rf) {
retval = rfkill_register(ipml->rf);
if (retval) {
rfkill_destroy(ipml->rf);
ipml->rf = NULL;
}
} else {
ipml->rf = NULL;
}
dev_set_drvdata(&acpi->dev, ipml);