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d3cb25a121
When remove module g_serial on quark platform, the following Warning on: Modules linked in: usb_f_acm u_serial g_serial(-) pch_udc libcomposite configfs udc_core ad7298 industrialio_triggered_buffer kfifo_buf tpm_i2c_infineon indus CPU: 0 PID: 369 Comm: modprobe Not tainted 3.14.29ltsi-WR7.0.0.0_standard #6 Hardware name: Intel Corp. QUARK/CrossHill, BIOS 0x010100F5 01/01/2014 f641df0c f641df0c f641dec8 c15ac7fa f641defc c103084f c16c2356 f641df28 00000171 c16b855c 000009dd c15b2d6f 000009dd c15b2d6f f6bd2000 faae5480 00000000 f641df14 c10308a3 00000009 f641df0c c16c2356 f641df28 f641df2c Call Trace: [<c15ac7fa>] dump_stack+0x16/0x18 [<c103084f>] warn_slowpath_common+0x7f/0xa0 [<c15b2d6f>] ? preempt_count_sub+0x6f/0xc0 [<c15b2d6f>] ? preempt_count_sub+0x6f/0xc0 [<c10308a3>] warn_slowpath_fmt+0x33/0x40 [<c15b2d6f>] preempt_count_sub+0x6f/0xc0 [<faadbc82>] pch_udc_pcd_pullup+0x32/0xa0 [pch_udc] [<fa9747d9>] usb_gadget_remove_driver+0x29/0x60 [udc_core] [<fa974869>] usb_gadget_unregister_driver+0x59/0x80 [udc_core] [<faa78310>] usb_composite_unregister+0x10/0x20 [libcomposite] [<faae50f1>] cleanup+0xd/0xf [g_serial] [<c1084c47>] SyS_delete_module+0xf7/0x150 [<c111f8dd>] ? ____fput+0xd/0x10 [<c104b2ae>] ? task_work_run+0x6e/0xa0 [<c15afda5>] syscall_call+0x7/0x7 g_serial module on quark is depended on pch_udc module, ttyGSX cann't recieve data and warning on when remove g_serial. It was unlocked before the modification of the structure it was protecting, fix it as "lock -> unlock" to resolve this. Signed-off-by: Pengyu Ma <pengyu.ma@windriver.com> Signed-off-by: Felipe Balbi <balbi@ti.com> |
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| .. | ||
| atm | ||
| c67x00 | ||
| chipidea | ||
| class | ||
| common | ||
| core | ||
| dwc2 | ||
| dwc3 | ||
| early | ||
| gadget | ||
| host | ||
| image | ||
| isp1760 | ||
| misc | ||
| mon | ||
| musb | ||
| phy | ||
| renesas_usbhs | ||
| serial | ||
| storage | ||
| usbip | ||
| wusbcore | ||
| Kconfig | ||
| Makefile | ||
| README | ||
| 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 ("hub_wq").
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.