You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

Greg Kroah-Hartman 71c2fb03fc USB: cdc-acm: remove unneeded spin_lock_irqsave/restore on write path ... When writing data we were: lock do some work unlock call function lock do some work unlock return return It turns out, that "function" was only ever called in the one place, so instead of locking/unlocking for no good reason, just inline the function and only grab the lock once. This has sped up the pathological case of sending 1 byte packets to a loop-back cdc-acm device from 49600 bytes per second to 50100 bytes a second on my workstation. A tiny increase yes, but noticable, and now the spinlock isn't the hottest thing on the perf graph anymore. Yes, we are still waiting for the hardware for the most part, but getting rid of a spinlock_irq_save() call for every packet is still a good thing. And we end up deleting lines of code, always a win overall. This was found by using a Teensy 3.0 device and the test program and firmware located at: http://www.pjrc.com/teensy/benchmark_usb_serial_receive.html Reported-by: Paul Stoffregen <paul@pjrc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		12 years ago
..
Kconfig	USB: regroup all depends on USB within an if USB block	12 years ago
Makefile	…
cdc-acm.c	USB: cdc-acm: remove unneeded spin_lock_irqsave/restore on write path	12 years ago
cdc-acm.h	…
cdc-wdm.c	USB: cdc-wdm: implement IOCTL_WDM_MAX_COMMAND	12 years ago
usblp.c	…
usbtmc.c	USB: usbtmc: Change magic number to constant	12 years ago