dpaa2-ptp: fix double free of the ptp_qoriq IRQ

Upon reusing the ptp_qoriq driver, the ptp_qoriq_free() function was
used on the remove path to free any allocated resources.
The ptp_qoriq IRQ is among these resources that are freed in
ptp_qoriq_free() even though it is also a managed one (allocated using
devm_request_threaded_irq).

Drop the resource managed version of requesting the IRQ in order to not
trigger a double free of the interrupt as below:

[  226.731005] Trying to free already-free IRQ 126
[  226.735533] WARNING: CPU: 6 PID: 749 at kernel/irq/manage.c:1707
__free_irq+0x9c/0x2b8
[  226.743435] Modules linked in:
[  226.746480] CPU: 6 PID: 749 Comm: bash Tainted: G        W
5.4.0-03629-gfd7102c32b2c-dirty #912
[  226.755857] Hardware name: NXP Layerscape LX2160ARDB (DT)
[  226.761244] pstate: 40000085 (nZcv daIf -PAN -UAO)
[  226.766022] pc : __free_irq+0x9c/0x2b8
[  226.769758] lr : __free_irq+0x9c/0x2b8
[  226.773493] sp : ffff8000125039f0
(...)
[  226.856275] Call trace:
[  226.858710]  __free_irq+0x9c/0x2b8
[  226.862098]  free_irq+0x30/0x70
[  226.865229]  devm_irq_release+0x14/0x20
[  226.869054]  release_nodes+0x1b0/0x220
[  226.872790]  devres_release_all+0x34/0x50
[  226.876790]  device_release_driver_internal+0x100/0x1c0

Fixes: d346c9e86d86 ("dpaa2-ptp: reuse ptp_qoriq driver")
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-ptp.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-ptp.c
index a9503ae..6437fe6 100644 (file)
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-ptp.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-ptp.c
@@ -160,10 +160,10 @@ static int dpaa2_ptp_probe(struct fsl_mc_device *mc_dev)
        irq = mc_dev->irqs[0];
        ptp_qoriq->irq = irq->msi_desc->irq;
 
-       err = devm_request_threaded_irq(dev, ptp_qoriq->irq, NULL,
-                                       dpaa2_ptp_irq_handler_thread,
-                                       IRQF_NO_SUSPEND | IRQF_ONESHOT,
-                                       dev_name(dev), ptp_qoriq);
+       err = request_threaded_irq(ptp_qoriq->irq, NULL,
+                                  dpaa2_ptp_irq_handler_thread,
+                                  IRQF_NO_SUSPEND | IRQF_ONESHOT,
+                                  dev_name(dev), ptp_qoriq);
        if (err < 0) {
                dev_err(dev, "devm_request_threaded_irq(): %d\n", err);
                goto err_free_mc_irq;
@@ -173,18 +173,20 @@ static int dpaa2_ptp_probe(struct fsl_mc_device *mc_dev)
                                   DPRTC_IRQ_INDEX, 1);
        if (err < 0) {
                dev_err(dev, "dprtc_set_irq_enable(): %d\n", err);
-               goto err_free_mc_irq;
+               goto err_free_threaded_irq;
        }
 
        err = ptp_qoriq_init(ptp_qoriq, base, &dpaa2_ptp_caps);
        if (err)
-               goto err_free_mc_irq;
+               goto err_free_threaded_irq;
 
        dpaa2_phc_index = ptp_qoriq->phc_index;
        dev_set_drvdata(dev, ptp_qoriq);
 
        return 0;
 
+err_free_threaded_irq:
+       free_irq(ptp_qoriq->irq, ptp_qoriq);
 err_free_mc_irq:
        fsl_mc_free_irqs(mc_dev);
 err_unmap: