nto the
    driver’s “enable MCQ IRQs” helper will re-enable an already-enabled
    IRQ, causing an unbalanced enable.
  - The driver already guards enable/disable with this flag:
    - Disable path: sets the flag false after disabling
      (drivers/ufs/host/ufs-mediatek.c:741).
    - Enable path: bails out if already enabled and sets the flag true
      only after enabling (drivers/ufs/host/ufs-mediatek.c:755 and
      drivers/ufs/host/ufs-mediatek.c:762).
  - With the new line in `ufs_mtk_config_mcq_irq()`
    (drivers/ufs/host/ufs-mediatek.c:2193), the initial state is
    correct, so `ufs_mtk_mcq_enable_irq()` will correctly no-op on the
    first enable attempt when IRQs are already enabled.

- How the bug manifested
  - `ufs_mtk_setup_clocks()`’s POST_CHANGE flow calls
    `ufs_mtk_mcq_enable_irq()` (drivers/ufs/host/ufs-mediatek.c:817).
    Before this patch, after `devm_request_irq()` the IRQs were already
    enabled but `is_mcq_intr_enabled` was still false, so the enable
    path would call `enable_irq()` again, risking “unbalanced IRQ
    enable” warnings.
  - The disable path is already consistent: `ufs_mtk_mcq_disable_irq()`
    uses the list of IRQs and flips the flag to false
    (drivers/ufs/host/ufs-mediatek.c:741), so subsequent enables are
    properly balanced.

- Scope and risk
  - Change is a single-line state fix in one driver function, confined
    to the Mediatek UFS host driver.
  - No API, ABI, or architectural changes; no behavioral changes beyond
    preventing an incorrect extra `enable_irq()`.
  - The flag is set only after all IRQ requests succeed; if any
    `devm_request_irq()` fails, the function returns early and does not
    set the flag, preserving prior behavior.

- Stable backport criteria
  - Fixes a real correctness issue that can lead to warnings and IRQ
    depth mismatches.
  - Small, contained, and low risk.
  - No feature addition; clear bug fix in a specific subsystem (SCSI UFS
    Mediatek host).

Given the above, this is a good candidate for stable backporting
wherever the Mediatek UFS MCQ driver and `is_mcq_intr_enabled` field
exist.

 drivers/ufs/host/ufs-mediatek.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 188f90e468c41..055b24758ca3d 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -2111,6 +2111,7 @@ static int ufs_mtk_config_mcq_irq(struct ufs_hba *hba)
 			return ret;
 		}
 	}
+	host->is_mcq_intr_enabled = true;
 
 	return 0;
 }
-- 
2.51.0[PATCH AUTOSEL 6.17-6.12] scsi: ufs: host: mediatek: Fix unbalanced IRQ enable issueSasha Levin <sashal@kernel.org> undefinedpatches@lists.linux.dev, stable@vger.kernel.org undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined�