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5cdf7d5be8
Otherwise the value from the last probe would be retained that possibly is freed since (the UDC is removed) and therefore no longer relevant. Reproducible with the dummy UDC: modprobe dummy_hcd mount -t gadgetfs gadgetfs /dev/gadget umount /dev/gadget rmmod dummy_hcd mount -t gadgetfs gadgetfs /dev/gadget BUG: unable to handle kernel paging request at ffffffffa066fd9d Call Trace: [<ffffffff811d0cd2>] ? d_alloc_name+0x22/0x50 [<ffffffff812b74dc>] ? selinux_d_instantiate+0x1c/0x20 [<ffffffffa067d687>] gadgetfs_create_file+0x27/0xa0 [gadgetfs] [<ffffffffa067da70>] ? setup_req.isra.4+0x80/0x80 [gadgetfs] [<ffffffffa067dbac>] gadgetfs_fill_super+0x13c/0x180 [gadgetfs] [<ffffffff811bc832>] mount_single+0x92/0xc0 [<ffffffffa067d0f8>] gadgetfs_mount+0x18/0x20 [gadgetfs] [<ffffffff811bc8f9>] mount_fs+0x39/0x1b0 [<ffffffff8116b220>] ? __alloc_percpu+0x10/0x20 [<ffffffff811d6da3>] vfs_kern_mount+0x63/0xf0 [<ffffffff811d93be>] do_mount+0x23e/0xac0 [<ffffffff811660eb>] ? strndup_user+0x4b/0xf0 [<ffffffff811d9f63>] SyS_mount+0x83/0xc0 [<ffffffff81695b69>] system_call_fastpath+0x16/0x1b Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Signed-off-by: Felipe Balbi <balbi@ti.com> |
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| atm | ||
| c67x00 | ||
| chipidea | ||
| class | ||
| core | ||
| dwc2 | ||
| dwc3 | ||
| early | ||
| gadget | ||
| host | ||
| image | ||
| misc | ||
| mon | ||
| musb | ||
| phy | ||
| renesas_usbhs | ||
| serial | ||
| storage | ||
| wusbcore | ||
| Kconfig | ||
| Makefile | ||
| README | ||
| usb-common.c | ||
| usb-skeleton.c | ||
To understand all the Linux-USB framework, you'll use these resources:
* This source code. This is necessarily an evolving work, and
includes kerneldoc that should help you get a current overview.
("make pdfdocs", and then look at "usb.pdf" for host side and
"gadget.pdf" for peripheral side.) Also, Documentation/usb has
more information.
* The USB 2.0 specification (from www.usb.org), with supplements
such as those for USB OTG and the various device classes.
The USB specification has a good overview chapter, and USB
peripherals conform to the widely known "Chapter 9".
* Chip specifications for USB controllers. Examples include
host controllers (on PCs, servers, and more); peripheral
controllers (in devices with Linux firmware, like printers or
cell phones); and hard-wired peripherals like Ethernet adapters.
* Specifications for other protocols implemented by USB peripheral
functions. Some are vendor-specific; others are vendor-neutral
but just standardized outside of the www.usb.org team.
Here is a list of what each subdirectory here is, and what is contained in
them.
core/ - This is for the core USB host code, including the
usbfs files and the hub class driver ("khubd").
host/ - This is for USB host controller drivers. This
includes UHCI, OHCI, EHCI, and others that might
be used with more specialized "embedded" systems.
gadget/ - This is for USB peripheral controller drivers and
the various gadget drivers which talk to them.
Individual USB driver directories. A new driver should be added to the
first subdirectory in the list below that it fits into.
image/ - This is for still image drivers, like scanners or
digital cameras.
../input/ - This is for any driver that uses the input subsystem,
like keyboard, mice, touchscreens, tablets, etc.
../media/ - This is for multimedia drivers, like video cameras,
radios, and any other drivers that talk to the v4l
subsystem.
../net/ - This is for network drivers.
serial/ - This is for USB to serial drivers.
storage/ - This is for USB mass-storage drivers.
class/ - This is for all USB device drivers that do not fit
into any of the above categories, and work for a range
of USB Class specified devices.
misc/ - This is for all USB device drivers that do not fit
into any of the above categories.