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libata: acpi: avoid passing NULL to ACPI evaluation method 

If ACPI handle for an ATA device is NULL, we shouldn't call
ata_dev_get_GTF as that function will use handle to do some ACPI
evaluation.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Aaron Lu 2014-03-14 13:46:09 +08:00 committed by Tejun Heo
parent 20e64fa429
commit c75da205e0
1 changed files with 1 additions and 0 deletions
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drivers/ata/libata-acpi.c
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@ -835,6 +835,7 @@ void ata_acpi_on_resume(struct ata_port *ap)
ata_for_each_dev(dev, &ap->link, ALL) { ata_for_each_dev(dev, &ap->link, ALL) {
ata_acpi_clear_gtf(dev); ata_acpi_clear_gtf(dev);
if (ata_dev_enabled(dev) && if (ata_dev_enabled(dev) &&
ata_dev_acpi_handle(dev) &&
ata_dev_get_GTF(dev, NULL) >= 0) ata_dev_get_GTF(dev, NULL) >= 0)
dev->flags |= ATA_DFLAG_ACPI_PENDING; dev->flags |= ATA_DFLAG_ACPI_PENDING;
} }