From: Thadeu Lima de Souza Cascardo Date: Wed, 9 Jun 2010 19:48:39 +0000 (-0300) Subject: classmate-laptop: should check for NULL as retval for rfkill_alloc X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b95d13eaf3d4ea093aba95c7f615f3b10708a2c4;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git classmate-laptop: should check for NULL as retval for rfkill_alloc 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 Cc: Johannes Berg 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 Signed-off-by: Matthew Garrett --- diff --git a/drivers/platform/x86/classmate-laptop.c b/drivers/platform/x86/classmate-laptop.c index 3bf399fe2bbc..73ea76e6f21e 100644 --- a/drivers/platform/x86/classmate-laptop.c +++ b/drivers/platform/x86/classmate-laptop.c @@ -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);