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Alan Stern bf74ad5bc4 [PATCH] Hold the device's parent's lock during probe and remove ... This patch (as604) makes the driver core hold a device's parent's lock as well as the device's lock during calls to the probe and remove methods in a driver. This facility is needed by USB device drivers, owing to the peculiar way USB devices work: A device provides multiple interfaces, and drivers are bound to interfaces rather than to devices; Nevertheless a reset, reset-configuration, suspend, or resume affects the entire device and requires the caller to hold the lock for the device, not just a lock for one of the interfaces. Since a USB driver's probe method is always called with the interface lock held, the locking order rules (always lock parent before child) prevent these methods from acquiring the device lock. The solution provided here is to call all probe and remove methods, for all devices (not just USB), with the parent lock already acquired. Although currently only the USB subsystem requires these changes, people have mentioned in prior discussion that the overhead of acquiring an extra semaphore in all the prove/remove sequences is not overly large. Up to now, the USB core has been using its own set of private semaphores. A followup patch will remove them, relying entirely on the device semaphores provided by the driver core. The code paths affected by this patch are: device_add and device_del: The USB core already holds the parent lock, so no actual change is needed. driver_register and driver_unregister: The driver core will now lock both the parent and the device before probing or removing. driver_bind and driver_unbind (in sysfs): These routines will now lock both the parent and the device before binding or unbinding. bus_rescan_devices: The helper routine will lock the parent before probing a device. I have not tested this patch for conflicts with other subsystems. As far as I can see, the only possibility of conflict would lie in the bus_rescan_devices pathway, and it seems pretty remote. Nevertheless, it would be good for this to get a lot of testing in -mm. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		19 years ago
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acorn	[ARM] Turn ARM RiscPC PCF8583 i2c RTC driver into a proper module	19 years ago
acpi	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
atm	[PATCH] drivers/atm/adummy.c NULL noise removal	19 years ago
base	[PATCH] Hold the device's parent's lock during probe and remove	19 years ago
block	[PATCH] cciss: fix for deregister_disk	19 years ago
bluetooth	[Bluetooth]: Add endian annotations to the core	19 years ago
cdrom	[PATCH] drivers/cdrom: kmalloc + memset -> kzalloc conversion	19 years ago
char	Revert radeon AGP aperture offset changes	19 years ago
connector	[PATCH] Add timestamp field to process events	19 years ago
cpufreq	[PATCH] clean up lock_cpu_hotplug() in cpufreq	19 years ago
crypto	[PATCH] CONFIG_IA32	19 years ago
dio	[PATCH] drivers/dio: kmalloc + memset -> kzalloc conversion	19 years ago
eisa	[PATCH] drivers/eisa: kmalloc + memset -> kzalloc conversion	19 years ago
fc4	[SPARC]: introduce a SPARC Kconfig symbol	19 years ago
firmware	[PATCH] dell_rbu: NULL noise removal	19 years ago
hwmon	[PATCH] hwmon: w83792d fix unused fan pins	19 years ago
i2c	[PATCH] i2c: Fix i2c-mv64xxx compilation error	19 years ago
ide	[PATCH] ide-cd: remove write-only cmd field from struct cdrom_info	19 years ago
ieee1394	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
infiniband	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
input	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
isdn	[PARISC] Mark hisax and pcbit ISDN drivers as not for parisc	19 years ago
macintosh	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
mca	[PATCH] fix missing includes	19 years ago
md	[PATCH] md: Change case of raid level reported in sys/mdX/md/level	19 years ago
media	[PATCH] Simplify the VIDEO_SAA7134_OSS Kconfig dependency line	19 years ago
message	[PATCH] i2o: Do not disable pci device when it's in use	19 years ago
mfd	[PATCH] input: fix ucb1x00-ts breakage after conversion to dynamic input_dev allocation	19 years ago
misc	Merge master.kernel.org:/home/rmk/linux-2.6-drvmodel	19 years ago
mmc	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
mtd	[SPARC]: introduce a SPARC Kconfig symbol	19 years ago
net	[TG3]: Update driver version and reldate.	19 years ago
nubus	…
oprofile	…
parisc	[PARISC] Make superio.c initialize before any driver needs it	19 years ago
parport	[PATCH] kfree cleanup: misc remaining drivers	19 years ago
pci	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
pcmcia	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
pnp	[PATCH] keep pnpbios usermod_helper away from hotplug_path[]	19 years ago
rapidio	[PATCH] rapidio: message interface updates	19 years ago
s390	[PATCH] driver kill hotplug word from sn and others fix	19 years ago
sbus	[PATCH] sbus/char/uctrl: missing prototypes and NULL noise removal	19 years ago
scsi	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
serial	[ARM] 3216/1: indent and typo in drivers/serial/pxa.c	19 years ago
sh	[PATCH] superhyway: multiple block support and VCR rework	19 years ago
sn	…
tc	[MIPS] zs.c: Resurrect the deceased zs.c for now.	19 years ago
telephony	[PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason	19 years ago
usb	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
video	[VIDEO] sbuslib: Disallow private mmaps.	19 years ago
w1	[PATCH] driver core: replace "hotplug" by "uevent"	19 years ago
zorro	[PATCH] fix missing includes	19 years ago
Kconfig	…
Makefile	Link USB drivers later in the kernel	19 years ago