linux-kernel - [PATCH v2 2/3] wifi: ath12k: Clear affinity hint before calling ath12k_pci_free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250225053447.16824-3-manivannan.sadhasivam@linaro.org>
Date: Tue, 25 Feb 2025 11:04:46 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: jjohnson@...nel.org
Cc: linux-wireless@...r.kernel.org,
	ath12k@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	ath11k@...ts.infradead.org,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 2/3] wifi: ath12k: Clear affinity hint before calling ath12k_pci_free_irq() in error path

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: a3012f206d07 ("wifi: ath12k: set IRQ affinity to CPU0 in case of one MSI vector")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/net/wireless/ath/ath12k/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c
index 06cff3849ab8..2851f6944b86 100644
--- a/drivers/net/wireless/ath/ath12k/pci.c
+++ b/drivers/net/wireless/ath/ath12k/pci.c
@@ -1689,6 +1689,8 @@ 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:
-- 
2.25.1