[PATCH] ata: libahci: Only warn for AHCI_HFLAG_MULTI_MSI set when genuine custom irq handler implemented

[John Garry]

For an AHCI controller with AHCI_HFLAG_MULTI_MSI flag set, we may get the
following log, regardless of whether a custom irq handler was implemented
or not:

[   14.700238] ahci 0000:74:03.0: both AHCI_HFLAG_MULTI_MSI flag set and custom 
irq handler implemented

This is because we can set hpriv->irq_handler to
ahci_single_level_irq_intr() if not already set, in
ahci_init_one()->ahci_pci_save_initial_config()->ahci_save_initial_config().

Stop having this warn being misleading by adding a check for
hpriv->irq_handler != ahci_single_level_irq_intr.

Signed-off-by: John Garry <john.ga...@huawei.com>

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index b5f57c69c487..692782dddc0f 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -2599,7 +2599,8 @@ int ahci_host_activate(struct ata_host *host, struct 
scsi_host_template *sht)
        int rc;
 
        if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
-               if (hpriv->irq_handler)
+               if (hpriv->irq_handler &&
+                   hpriv->irq_handler != ahci_single_level_irq_intr)
                        dev_warn(host->dev,
                                 "both AHCI_HFLAG_MULTI_MSI flag set and custom 
irq handler implemented\n");
                if (!hpriv->get_irq_vector) {
-- 
2.17.1