Yeoreum Yun 6402078bd9 smc91x: fix broken irq-context in PREEMPT_RT ... When smc91x.c is built with PREEMPT_RT, the following splat occurs in FVP_RevC: [ 13.055000] smc91x LNRO0003:00 eth0: link up, 10Mbps, half-duplex, lpa 0x0000 [ 13.062137] BUG: workqueue leaked atomic, lock or RCU: kworker/2:1[106] [ 13.062137] preempt=0x00000000 lock=0->0 RCU=0->1 workfn=mld_ifc_work [ 13.062266] C ** replaying previous printk message ** [ 13.062266] CPU: 2 UID: 0 PID: 106 Comm: kworker/2:1 Not tainted 6.18.0-dirty #179 PREEMPT_{RT,(full)} [ 13.062353] Hardware name: , BIOS [ 13.062382] Workqueue: mld mld_ifc_work [ 13.062469] Call trace: [ 13.062494] show_stack+0x24/0x40 (C) [ 13.062602] __dump_stack+0x28/0x48 [ 13.062710] dump_stack_lvl+0x7c/0xb0 [ 13.062818] dump_stack+0x18/0x34 [ 13.062926] process_scheduled_works+0x294/0x450 [ 13.063043] worker_thread+0x260/0x3d8 [ 13.063124] kthread+0x1c4/0x228 [ 13.063235] ret_from_fork+0x10/0x20 This happens because smc_special_trylock() disables IRQs even on PREEMPT_RT, but smc_special_unlock() does not restore IRQs on PREEMPT_RT. The reason is that smc_special_unlock() calls spin_unlock_irqrestore(), and rcu_read_unlock_bh() in __dev_queue_xmit() cannot invoke rcu_read_unlock() through __local_bh_enable_ip() when current->softirq_disable_cnt becomes zero. To address this issue, replace smc_special_trylock() with spin_trylock_irqsave(). Fixes: 342a93247e ("locking/spinlock: Provide RT variant header: <linux/spinlock_rt.h>") Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20251217085115.1730036-1-yeoreum.yun@arm.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>		2025-12-23 15:28:34 +01:00
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accel	…
accessibility	…
acpi	platform-drivers-x86 for v6.19-1	2025-12-10 06:38:17 +09:00
amba	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
android	Char/Misc/IIO driver updates for 6.19-rc1	2025-12-06 18:34:24 -08:00
ata	ata fix for 6.19-rc1	2025-12-05 20:41:20 -08:00
atm	…
auxdisplay	…
base	More power management updates for 6.19-rc1	2025-12-10 06:29:40 +09:00
bcma	…
block	We have a patch that adds an initial set of tracepoints to the MDS	2025-12-14 15:24:10 +12:00
bluetooth	Bluetooth: btusb: revert use of devm_kzalloc in btusb	2025-12-19 17:23:18 -05:00
bus	Char/Misc/IIO driver updates for 6.19-rc1	2025-12-06 18:34:24 -08:00
cache	…
cdrom	…
cdx	…
char	Char/Misc/IIO driver updates for 6.19-rc1	2025-12-06 18:34:24 -08:00
clk	This pull request is entirely SoC clk drivers, not for lack of trying to modify	2025-12-08 09:38:52 +09:00
clocksource	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
comedi	Char/Misc/IIO driver updates for 6.19-rc1	2025-12-06 18:34:24 -08:00
connector	…
counter	…
cpufreq	Driver core changes for 6.19-rc1	2025-12-05 21:29:02 -08:00
cpuidle	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
crypto	tsm for 6.19	2025-12-06 10:15:41 -08:00
cxl	soc: driver updates for 6.19, part 2	2025-12-05 17:47:59 -08:00
dax	Significant patch series in this merge are as follows:	2025-12-05 13:52:43 -08:00
dca	…
devfreq	…
dibs	dibs: Remove KMSG_COMPONENT macro	2025-11-27 18:11:43 -08:00
dio	…
dma	dmaengine updates for v6.19	2025-12-09 06:35:53 +09:00
dma-buf	VFIO updates for v6.19-rc1	2025-12-04 18:42:48 -08:00
dpll	…
edac	bitmap updates for v6.19	2025-12-06 09:01:27 -08:00
eisa	…
extcon	…
firewire	firewire updates for v6.19	2025-12-04 12:26:36 -08:00
firmware	LoongArch changes for v6.19	2025-12-13 05:44:03 +12:00
fpga	…
fsi	…
fwctl	…
gnss	…
gpib	…
gpio	gpio updates for v6.19-rc1	2025-12-13 16:36:57 +12:00
gpu	drm fixes for 6.19-rc1	2025-12-13 17:39:28 +12:00
greybus	…
hid	platform-drivers-x86 for v6.19-1	2025-12-10 06:38:17 +09:00
hsi	…
hte	…
hv	hyperv-next for v6.19	2025-12-09 06:10:17 +09:00
hwmon	hwmon fixes for v6.19-rc1	2025-12-09 08:46:10 +09:00
hwspinlock	…
hwtracing	Char/Misc/IIO driver updates for 6.19-rc1	2025-12-06 18:34:24 -08:00
i2c	i2c-for-6.19-rc1	2025-12-10 07:48:05 +09:00
i3c	i3c: adi: Fix confusing cleanup.h syntax	2025-12-12 23:59:39 +01:00
idle	…
iio	Char/Misc/IIO driver updates for 6.19-rc1	2025-12-06 18:34:24 -08:00
infiniband	RDMA v6.19 merge window pull request	2025-12-04 18:54:37 -08:00
input	Input updates for v6.19-rc0	2025-12-10 16:44:18 +09:00
interconnect	…
iommu	tsm for 6.19	2025-12-06 10:15:41 -08:00
ipack	…
irqchip	Misc fixes:	2025-12-14 06:07:09 +12:00
isdn	…
leds	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
macintosh	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
mailbox	mailbox: th1520: fix clock imbalance on probe failure	2025-11-28 09:47:44 -06:00
mcb	…
md	SCSI misc on 20251214	2025-12-14 15:35:35 +12:00
media	Modules changes for v6.19-rc1	2025-12-06 08:27:07 -08:00
memory	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
memstick	…
message	…
mfd	MFD for v6.19	2025-12-04 15:18:33 -08:00
misc	SCSI misc on 20251214	2025-12-14 15:35:35 +12:00
mmc	MMC core:	2025-12-04 14:10:16 -08:00
most	…
mtd	This pull request contains the following changes for UBI and UBIFS:	2025-12-09 08:50:27 +09:00
mux	…
net	smc91x: fix broken irq-context in PREEMPT_RT	2025-12-23 15:28:34 +01:00
nfc	nfc: pn533: Fix error code in pn533_acr122_poweron_rdr()	2025-12-11 01:40:00 -08:00
ntb	…
nubus	…
nvdimm	NVDIMM changes for 6.19	2025-12-06 09:32:25 -08:00
nvme	block-6.19-20251208	2025-12-09 08:53:24 +09:00
nvmem	Char/Misc/IIO driver updates for 6.19-rc1	2025-12-06 18:34:24 -08:00
of	soundwire updates for 6.19	2025-12-13 16:26:55 +12:00
opp	…
parisc	parisc architecture fixes and updates for kernel v6.19-rc1:	2025-12-06 16:24:52 -08:00
parport	…
pci	pci-v6.19-fixes-1	2025-12-13 16:29:22 +12:00
pcmcia	…
peci	Char/Misc/IIO driver updates for 6.19-rc1	2025-12-06 18:34:24 -08:00
perf	arm64 updates for 6.19:	2025-12-02 17:03:55 -08:00
phy	…
pinctrl	Pin control changes for the v6.19 kernel cycle:	2025-12-09 06:45:00 +09:00
platform	platform-drivers-x86 for v6.19-1	2025-12-10 06:38:17 +09:00
pmdomain	pmdomain core:	2025-12-04 13:50:39 -08:00
pnp	…
power	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
powercap	Devicetree updates for v6.19:	2025-12-04 15:50:37 -08:00
pps	printk changes for 6.19	2025-12-03 12:42:36 -08:00
ps3	…
ptp	Networking changes for 6.19.	2025-12-03 17:24:33 -08:00
pwm	pwm: th1520: Fix missing Kconfig dependencies	2025-12-13 16:41:50 +12:00
rapidio	…
ras	EFI updates for v6.19:	2025-12-04 17:10:08 -08:00
regulator	regulator: Fixes for v6.19	2025-12-11 09:54:59 +09:00
remoteproc	remoteproc: qcom_q6v5_wcss: use optional reset for wcss_q6_bcr_reset	2025-11-29 15:20:23 -06:00
resctrl	…
reset	This pull request is entirely SoC clk drivers, not for lack of trying to modify	2025-12-08 09:38:52 +09:00
rpmsg	…
rtc	RTC for 6.19	2025-12-13 17:09:06 +12:00
s390	s390: Unmap early KASAN shadow on memory offlining	2025-12-07 16:15:19 +01:00
sbus	…
scsi	SCSI misc on 20251214	2025-12-14 15:35:35 +12:00
sh	…
siox	…
slimbus	Networking changes for 6.19.	2025-12-03 17:24:33 -08:00
soc	bitmap updates for v6.19	2025-12-06 09:01:27 -08:00
soundwire	soundwire: intel_ace2x: handle multi BPT sections	2025-12-08 12:37:27 +05:30
spi	spi: Fixes for v6.19	2025-12-11 09:57:08 +09:00
spmi	…
ssb	…
staging	Staging driver updates for 6.19-rc1	2025-12-06 18:52:00 -08:00
target	SCSI misc on 20251214	2025-12-14 15:35:35 +12:00
tc	…
tee	…
thermal	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
thunderbolt	USB/Thunderbolt changes for 6.19-rc1	2025-12-06 18:42:12 -08:00
tty	TTY/Serial changes for 6.19-rc1	2025-12-06 18:38:19 -08:00
ufs	scsi: ufs: qcom: Fix confusing cleanup.h syntax	2025-12-08 22:11:00 -05:00
uio	…
usb	USB/Thunderbolt changes for 6.19-rc1	2025-12-06 18:42:12 -08:00
vdpa	Significant patch series in this merge are as follows:	2025-12-05 13:52:43 -08:00
vfio	drm next part 2 for 6.19-rc1	2025-12-04 19:42:53 -08:00
vhost	virtio,vhost: fixes, cleanups	2025-12-04 18:59:21 -08:00
video	fbdev fixes & enhancements for 6.19-rc1:	2025-12-06 15:41:26 -08:00
virt	virt: Fix Kconfig warning when selecting TSM without VIRT_DRIVERS	2025-12-04 17:34:16 -08:00
virtio	virtio: clean up features qword/dword terms	2025-11-27 02:03:07 -05:00
w1	…
watchdog	linux-watchdog 6.19-rc1 tag	2025-12-06 10:00:49 -08:00
xen	xen: branch for v6.19-rc1	2025-12-06 10:49:19 -08:00
zorro	…
Kconfig	Staging driver updates for 6.19-rc1	2025-12-06 18:52:00 -08:00
Makefile	Staging driver updates for 6.19-rc1	2025-12-06 18:52:00 -08:00