wifi: ath12k: Clear affinity hint before calling ath12k_pci_free_irq() in error path

commit b43b1e2 upstream.

If a shared IRQ is used by the driver due to platform limitation, then the
IRQ affinity hint is set right after the allocation of IRQ vectors in
ath12k_pci_msi_alloc(). This does no harm unless one of the functions
requesting the IRQ fails and attempt to free the IRQ.

This may end up with a warning from the IRQ core that is expecting the
affinity hint to be cleared before freeing the IRQ:

kernel/irq/manage.c:

	/* make sure affinity_hint is cleaned up */
	if (WARN_ON_ONCE(desc->affinity_hint))
		desc->affinity_hint = NULL;

So to fix this issue, clear the IRQ affinity hint before calling
ath12k_pci_free_irq() in the error path. The affinity will be cleared once
again further down the error path due to code organization, but that does
no harm.

Fixes: a3012f2 ("wifi: ath12k: set IRQ affinity to CPU0 in case of one MSI vector")
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Reviewed-by: Baochen Qiang <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jeff Johnson <[email protected]>
Signed-off-by: Wenshan Lan <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Mani-Sadhasivam

drivers/net/wireless/ath/ath12k/pci.c

@@ -1506,6 +1506,8 @@ static int ath12k_pci_probe(struct pci_dev *pdev,
 	return 0;
 
 err_free_irq:
+	/* __free_irq() expects the caller to have cleared the affinity hint */
+	ath12k_pci_set_irq_affinity_hint(ab_pci, NULL);
 	ath12k_pci_free_irq(ab);
 
 err_ce_free: