From 89857a8a5c89a406b967ab2be7bd2ccdbe75e73d Mon Sep 17 00:00:00 2001 From: Madalin Bucur Date: Fri, 21 Dec 2018 16:41:42 +0200 Subject: soc: fsl: qbman: avoid race in clearing QMan interrupt By clearing all interrupt sources, not only those that already occurred, the existing code may acknowledge by mistake interrupts that occurred after the code checks for them. Signed-off-by: Madalin Bucur Signed-off-by: Roy Pledge Signed-off-by: Li Yang --- drivers/soc/fsl/qbman/qman.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/soc/fsl/qbman/qman.c b/drivers/soc/fsl/qbman/qman.c index 52c153cd795a..636f83f781f5 100644 --- a/drivers/soc/fsl/qbman/qman.c +++ b/drivers/soc/fsl/qbman/qman.c @@ -1143,18 +1143,19 @@ static void qm_mr_process_task(struct work_struct *work); static irqreturn_t portal_isr(int irq, void *ptr) { struct qman_portal *p = ptr; - - u32 clear = QM_DQAVAIL_MASK | p->irq_sources; u32 is = qm_in(&p->p, QM_REG_ISR) & p->irq_sources; + u32 clear = 0; if (unlikely(!is)) return IRQ_NONE; /* DQRR-handling if it's interrupt-driven */ - if (is & QM_PIRQ_DQRI) + if (is & QM_PIRQ_DQRI) { __poll_portal_fast(p, QMAN_POLL_LIMIT); + clear = QM_DQAVAIL_MASK | QM_PIRQ_DQRI; + } /* Handling of anything else that's interrupt-driven */ - clear |= __poll_portal_slow(p, is); + clear |= __poll_portal_slow(p, is) & QM_PIRQ_SLOW; qm_out(&p->p, QM_REG_ISR, clear); return IRQ_HANDLED; } -- cgit v1.2.3 From 46edb8d1322c1763dd04e179992f8e9996085047 Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Tue, 22 Jan 2019 11:35:25 +0000 Subject: firmware: arm_scmi: provide the mandatory device release callback The device/driver model clearly mandates that bus driver that discover and allocate the device must set the release callback. This callback will be used to free the device after all references have gone away. scmi bus driver is missing the obvious callback which will result in the following warning if the device is unregistered: Device 'scmi_dev.1' does not have a release() function, it is broken and must be fixed. See Documentation/kobject.txt. WARNING at drivers/base/core.c:922 device_release+0x8c/0xa0 Hardware name: ARM LTD Juno Development Platform BIOS EDK II Jan 21 2019 Workqueue: events deferred_probe_work_func pstate: 60000005 (nZCv daif -PAN -UAO) pc : device_release+0x8c/0xa0 lr : device_release+0x8c/0xa0 Call trace: device_release+0x8c/0xa0 kobject_put+0x8c/0x208 device_unregister+0x30/0x78 scmi_device_destroy+0x28/0x50 scmi_probe+0x354/0x5b0 platform_drv_probe+0x58/0xa8 really_probe+0x2c4/0x3e8 driver_probe_device+0x12c/0x148 __device_attach_driver+0xac/0x150 bus_for_each_drv+0x78/0xd8 __device_attach+0xe0/0x168 device_initial_probe+0x24/0x30 bus_probe_device+0xa0/0xa8 deferred_probe_work_func+0x8c/0xe0 process_one_work+0x1f0/0x478 worker_thread+0x22c/0x450 kthread+0x134/0x138 ret_from_fork+0x10/0x1c ---[ end trace 420bdb7f6af50937 ]--- Fix the issue by providing scmi_device_release callback. We have everything required for device release already in scmi_device_destroy, so we just need to move freeing of the device to scmi_device_release. Fixes: 933c504424a2 ("firmware: arm_scmi: add scmi protocol bus to enumerate protocol devices") Signed-off-by: Sudeep Holla Cc: stable@vger.kernel.org # 4.17+ Signed-off-by: Arnd Bergmann --- drivers/firmware/arm_scmi/bus.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c index 472c88ae1c0f..92f843eaf1e0 100644 --- a/drivers/firmware/arm_scmi/bus.c +++ b/drivers/firmware/arm_scmi/bus.c @@ -119,6 +119,11 @@ void scmi_driver_unregister(struct scmi_driver *driver) } EXPORT_SYMBOL_GPL(scmi_driver_unregister); +static void scmi_device_release(struct device *dev) +{ + kfree(to_scmi_dev(dev)); +} + struct scmi_device * scmi_device_create(struct device_node *np, struct device *parent, int protocol) { @@ -138,6 +143,7 @@ scmi_device_create(struct device_node *np, struct device *parent, int protocol) scmi_dev->dev.parent = parent; scmi_dev->dev.of_node = np; scmi_dev->dev.bus = &scmi_bus_type; + scmi_dev->dev.release = scmi_device_release; dev_set_name(&scmi_dev->dev, "scmi_dev.%d", id); retval = device_register(&scmi_dev->dev); @@ -156,9 +162,8 @@ free_mem: void scmi_device_destroy(struct scmi_device *scmi_dev) { scmi_handle_put(scmi_dev->handle); - device_unregister(&scmi_dev->dev); ida_simple_remove(&scmi_bus_id, scmi_dev->id); - kfree(scmi_dev); + device_unregister(&scmi_dev->dev); } void scmi_set_handle(struct scmi_device *scmi_dev) -- cgit v1.2.3