kernel/linux.git/drivers/gpio, branch v6.6.148

gpio: mt7621: avoid corruption of shared interrupt trigger state

2026-08-03T09:15:39+00:00

[ Upstream commit 1781172526d1092323af443fa03f00e6de560401 ] The bank-shared fields like 'rising' and 'falling' are modified using non-atomic read-modify-write operations. Since every gpio chip instance represents an entire bank of 32 pins, if 'mediatek_gpio_irq_type()' is called concurrently for different IRQs on the same bank a possible overwrite of each other's configuration is possible. Thus, protect this state with 'gpio_generic_lock_irqsave' lock in the same way it is handled in irp_chip 'mediatek_gpio_irq_mask()' and 'mediatek_gpio_irq_unmask()' callbacks. Cc: stable@vger.kernel.org Reported-by: Sashiko Fixes: 4ba9c3afda41 ("gpio: mt7621: Add a driver for MT7621") Signed-off-by: Sergio Paracuellos Link: https://patch.msgid.link/20260626060112.2498324-2-sergio.paracuellos@gmail.com Signed-off-by: Bartosz Golaszewski [ Changed `guard(gpio_generic_lock_irqsave)(&rg->chip)` to `guard(spinlock_irqsave)(&rg->lock)` as the generic GPIO chip lock does not exist in this tree. ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

gpio: tegra: do not call pinctrl for GPIO direction

2026-08-03T09:15:39+00:00

[ Upstream commit d3e91a95b2b0fc6336dbf3ec90d831a1654d2720 ] tegra_gpio_direction_input() and tegra_gpio_direction_output() already program the GPIO controller direction registers directly. The additional pinctrl_gpio_direction_input/output() calls do not add a Tegra pinctrl operation, because the Tegra pinmux ops provide GPIO request/free handling but no gpio_set_direction hook. The extra call still enters the pinctrl core and takes pctldev->mutex. Shared GPIO users can call the direction path while holding their per-line spinlock, so this otherwise redundant pinctrl direction call can sleep in an atomic context. This was found by our static analysis tool and then confirmed by manual review of tegra_gpio_probe(), the Tegra GPIO direction callbacks and the Tegra pinctrl ops. The reviewed path has a default non-sleeping struct gpio_chip while the direction callback still enters the pinctrl mutex path. A directed runtime validation kept the same non-sleeping chip registration and drove: gpio_shared_proxy_direction_output() gpiod_direction_output_raw_commit() tegra_gpio_direction_output() pinctrl_gpio_direction_output() Lockdep reported a sleep-in-atomic warning with the shared GPIO spinlock held and pinctrl_get_device_gpio_range() plus tegra_gpio_direction_output() on the stack. Do not mark the whole chip as can_sleep to paper over this: can_sleep describes whether get()/set() may sleep, and Tegra value access is MMIO. Remove the redundant pinctrl direction calls and keep pinctrl involvement in the existing request/free path. Fixes: 11da90541283 ("gpio: tegra: Fix offset of pinctrl calls") Cc: stable@vger.kernel.org Signed-off-by: Runyu Xiao Link: https://patch.msgid.link/20260619152439.1239561-1-runyu.xiao@seu.edu.cn Signed-off-by: Bartosz Golaszewski Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

pinctrl: remove pinctrl_gpio_direction_output()

2026-08-03T09:15:39+00:00

[ Upstream commit 45d2055b0067739253883dc541f37c86aad45c92 ] There are no more users of pinctrl_gpio_direction_output() so remove it. Signed-off-by: Bartosz Golaszewski Acked-by: Linus Walleij Stable-dep-of: d3e91a95b2b0 ("gpio: tegra: do not call pinctrl for GPIO direction") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

gpio: sch: use raw_spinlock_t in the irq startup path

2026-07-24T14:03:48+00:00

[ Upstream commit 286533cb14a3c8a8bd39ff64ea2fc8e1aa0f638b ] sch_irq_unmask() enables the GPIO IRQ and then updates the controller state through sch_irq_mask_unmask(), which takes sch->lock with spin_lock_irqsave(). The callback can be reached from irq_startup() while setting up a requested IRQ. That path is not sleepable, but on PREEMPT_RT a regular spinlock_t becomes a sleeping lock. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the request_threaded_irq() -> __setup_irq() -> irq_startup() -> sch_irq_unmask() -> sch_irq_mask_unmask() carrier and used the original spin_lock_irqsave(&sch->lock) edge. Lockdep reported: BUG: sleeping function called from invalid context hardirqs last disabled at ... __setup_irq.constprop.0 ... [vuln_msv] sch_rt_spin_lock_irqsave+0x1c/0x30 [vuln_msv] sch_irq_mask_unmask.constprop.0+0x31/0x70 [vuln_msv] __setup_irq.constprop.0+0xd/0x30 [vuln_msv] Convert the SCH controller lock to raw_spinlock_t. The same lock is also used by the GPIO direction and value callbacks, but those critical sections only update MMIO-backed GPIO registers and do not contain sleepable operations. Keeping this register lock non-sleeping is therefore appropriate for the irqchip callbacks and does not change the GPIO-side locking contract. Fixes: 7a81638485c1 ("gpio: sch: Add edge event support") Cc: stable@vger.kernel.org Signed-off-by: Runyu Xiao Reviewed-by: Sebastian Andrzej Siewior Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/20260617154035.1199948-2-runyu.xiao@seu.edu.cn Signed-off-by: Bartosz Golaszewski [ adjusted context for 6.6's pre-MMIO `iobase` port I/O and void `sch_gpio_set()` (no set_rv `return 0;`) ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

gpios: palmas: add .get_direction() op

2026-07-24T14:03:42+00:00

commit db4a79713ed8e252d5e4edf6eaaa80948b6855a2 upstream. Accessing debug/gpio is quite noisy without a get_direction() implementation. To calm that down add an implementation. Fixes: 3d50a2785271 ("gpio: palmas: Add support for Palmas GPIO") Cc: stable@vger.kernel.org Reviewed-by: Linus Walleij Signed-off-by: Andreas Kemnade Link: https://patch.msgid.link/20260704-palmas-getdirection-v2-1-2fd85fee3832@kemnade.info Signed-off-by: Bartosz Golaszewski Signed-off-by: Greg Kroah-Hartman

gpio-f7188x: Add support for NCT6126D version B

2026-07-24T14:03:41+00:00

commit 9a6c0b6ea12746d50cf53d59a7e05fd83f974bda upstream. The Nuvoton NCT6126D Super-I/O is available in two hardware revisions. According to the manufacturer datasheet revision 2.4, version A reports chip ID 0xD283, while version B reports chip ID 0xD284. The driver currently only recognizes only the version A ID. Version B only contains hardware fixes unrelated to the GPIO functionality, so it can be supported by simply adding its chip ID without any other driver changes. Fixes: 3002b8642f01 ("gpio-f7188x: fix chip name and pin count on Nuvoton chip") Cc: stable@vger.kernel.org Signed-off-by: Paul Louvel Link: https://patch.msgid.link/20260629-gpio-f7188x-nct6126d-version-b-v1-1-a06226c02a2d@bootlin.com Signed-off-by: Bartosz Golaszewski Signed-off-by: Greg Kroah-Hartman

gpio: timberdale: Return -ENOMEM on dynamic memory allocation in probe

2026-07-24T14:03:25+00:00

[ Upstream commit 8d7e62d5e9b2d2ff146f472a9215d7e29c7e2307 ] Out of memory situation on driver's probe is expected to be reported to the driver's framework with a proper -ENOMEM error code. Fixes: 35570ac6039e ("gpio: add GPIO driver for the Timberdale FPGA") Signed-off-by: Vladimir Zapolskiy Link: https://patch.msgid.link/20260630145148.4081967-1-vz@kernel.org Signed-off-by: Bartosz Golaszewski Signed-off-by: Sasha Levin

gpio: htc-egpio: use managed gpiochip registration

2026-07-24T14:03:24+00:00

[ Upstream commit 17326db5f0ab4ec1901e75d052b5ebef486b467f ] egpio_probe() registers each nested gpio_chip with gpiochip_add_data() but ignores the return value. If one registration fails, probe still returns success even though one of the chips was not published to gpiolib. Use devm_gpiochip_add_data() and fail probe if any chip registration fails. This lets devres unwind already registered chips and prevents the driver from publishing a partially initialized device. Fixes: a1635b8fe59d ("[ARM] 4947/1: htc-egpio, a driver for GPIO/IRQ expanders with fixed input/output pins") Signed-off-by: Pengpeng Hou Link: https://patch.msgid.link/20260624131828.94139-1-pengpeng@iscas.ac.cn Signed-off-by: Bartosz Golaszewski Signed-off-by: Sasha Levin

gpio: mvebu: fail probe if gpiochip registration fails

2026-07-24T14:03:24+00:00

[ Upstream commit 479e91fc92416a4d54d2b3150aa1e4550d9cc759 ] mvebu_gpio_probe() registers the GPIO chip with devm_gpiochip_add_data() but ignores the return value. If registration fails, probe continues and leaves later code operating on a GPIO chip that was never published to gpiolib. Return the registration error so the device fails probe cleanly. Fixes: fefe7b092345 ("gpio: introduce gpio-mvebu driver for Marvell SoCs") Signed-off-by: Pengpeng Hou Link: https://patch.msgid.link/20260624131645.86884-1-pengpeng@iscas.ac.cn Signed-off-by: Bartosz Golaszewski Signed-off-by: Sasha Levin

gpio: mlxbf3: fail probe if gpiochip registration fails

2026-07-24T14:03:18+00:00

[ Upstream commit 0482862a90169f4daaba0ed31a85d8304bf51e04 ] mlxbf3_gpio_probe() logs a devm_gpiochip_add_data() failure but still returns success. That leaves the platform device bound even though the GPIO chip was not registered. Return the registration error so probe failure matches the missing gpiochip state. Fixes: cd33f216d241 ("gpio: mlxbf3: Add gpio driver support") Signed-off-by: Pengpeng Hou Reviewed-by: Linus Walleij Link: https://patch.msgid.link/20260615091918.43333-1-pengpeng@iscas.ac.cn Signed-off-by: Bartosz Golaszewski Signed-off-by: Sasha Levin