diff options
| -rw-r--r-- | drivers/ata/libata-core.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index ec3ce120a517..89fd0e9ed746 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -7178,6 +7178,10 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht) * request IRQ and register it. This helper takes necessasry * arguments and performs the three steps in one go. * + * An invalid IRQ skips the IRQ registration and expects the host to + * have set polling mode on the port. In this case, @irq_handler + * should be NULL. + * * LOCKING: * Inherited from calling layer (may sleep). * @@ -7194,6 +7198,12 @@ int ata_host_activate(struct ata_host *host, int irq, if (rc) return rc; + /* Special case for polling mode */ + if (!irq) { + WARN_ON(irq_handler); + return ata_host_register(host, sht); + } + rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags, dev_driver_string(host->dev), host); if (rc) |