1. 03 Feb, 2007 1 commit
  2. 20 Dec, 2006 1 commit
  3. 07 Dec, 2006 1 commit
  4. 05 Oct, 2006 1 commit
    • David Howells's avatar
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      David Howells authored
      
      
      Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
      of passing regs around manually through all ~1800 interrupt handlers in the
      Linux kernel.
      
      The regs pointer is used in few places, but it potentially costs both stack
      space and code to pass it around.  On the FRV arch, removing the regs parameter
      from all the genirq function results in a 20% speed up of the IRQ exit path
      (ie: from leaving timer_interrupt() to leaving do_IRQ()).
      
      Where appropriate, an arch may override the generic storage facility and do
      something different with the variable.  On FRV, for instance, the address is
      maintained in GR28 at all times inside the kernel as part of general exception
      handling.
      
      Having looked over the code, it appears that the parameter may be handed down
      through up to twenty or so layers of functions.  Consider a USB character
      device attached to a USB hub, attached to a USB controller that posts its
      interrupts through a cascaded auxiliary interrupt controller.  A character
      device driver may want to pass regs to the sysrq handler through the input
      layer which adds another few layers of parameter passing.
      
      I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
      main part of the code on FRV and i386, though I can't test most of the drivers.
      I've also done partial conversion for powerpc and MIPS - these at least compile
      with minimal configurations.
      
      This will affect all archs.  Mostly the changes should be relatively easy.
      Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
      
      	struct pt_regs *old_regs = set_irq_regs(regs);
      
      And put the old one back at the end:
      
      	set_irq_regs(old_regs);
      
      Don't pass regs through to generic_handle_irq() or __do_IRQ().
      
      In timer_interrupt(), this sort of change will be necessary:
      
      	-	update_process_times(user_mode(regs));
      	-	profile_tick(CPU_PROFILING, regs);
      	+	update_process_times(user_mode(get_irq_regs()));
      	+	profile_tick(CPU_PROFILING);
      
      I'd like to move update_process_times()'s use of get_irq_regs() into itself,
      except that i386, alone of the archs, uses something other than user_mode().
      
      Some notes on the interrupt handling in the drivers:
      
       (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
           the input_dev struct.
      
       (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
           something different depending on whether it's been supplied with a regs
           pointer or not.
      
       (*) Various IRQ handler function pointers have been moved to type
           irq_handler_t.
      Signed-Off-By: default avatarDavid Howells <dhowells@redhat.com>
      (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
      7d12e780
  5. 27 Sep, 2006 1 commit
    • Pete Zaitcev's avatar
      USB: Dealias -110 code (more complete) · 38e2bfc9
      Pete Zaitcev authored
      
      
      The purpose of this patch is to split off the case when a device does
      not reply on the lower level (which is reported by HC hardware), and
      a case when the device accepted the request, but does not reply at
      upper level. This redefinition allows to diagnose issues easier,
      without asking the user if the -110 happened "immediately".
      
      The usbmon splits such cases already thanks to its timestamp, but
      it's not always available.
      
      I adjusted all drivers which I found affected (by searching for "urb").
      Out of tree drivers may suffer a little bit, but I do not expect much
      breakage. At worst they may print a few messages.
      Signed-off-by: default avatarPete Zaitcev <zaitcev@redhat.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      38e2bfc9
  6. 31 Aug, 2006 1 commit
  7. 02 Aug, 2006 1 commit
  8. 12 Jul, 2006 1 commit
    • Dan Streetman's avatar
      [PATCH] USB: add ZyXEL vendor/product ID to rtl8150 driver · b6c2799d
      Dan Streetman authored
      
      
      I just got a "ZyXEL Prestige USB Adapter" that is actually RTL8150
      adapter.  Here is the relevant /proc/bus/usb/devices output (after
      adding the vendor/product IDs to the driver):
      
      T:  Bus=01 Lev=02 Prnt=02 Port=02 Cnt=02 Dev#=119 Spd=12  MxCh= 0
      D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
      P:  Vendor=0586 ProdID=401a Rev= 1.00
      S:  Manufacturer=ZyXEL
      S:  Product=Prestige USB Adapter
      S:  SerialNumber=1027
      C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=120mA
      I:  If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=ff Driver=rtl8150
      E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
      E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
      E:  Ad=83(I) Atr=03(Int.) MxPS=   8 Ivl=1ms
      
      This patch adds the ZyXEL vendor ID to the rtl8150.c driver.  The
      device has absolutely no identifying marks on the outside for model
      type, just a serial number, and I can't find anything on ZyXEL's
      website, so I called the product ID PRODUCT_ID_PRESTIGE to match the
      product string.
      Signed-off-by: default avatarDan Streetman <ddstreet@ieee.org>
      Acked-by: <petkan@users.sourceforge.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      b6c2799d
  9. 30 Jun, 2006 1 commit
  10. 20 Mar, 2006 1 commit
  11. 04 Jan, 2006 1 commit
  12. 28 Oct, 2005 1 commit
  13. 08 Sep, 2005 1 commit
    • Alan Stern's avatar
      [PATCH] USB: URB_ASYNC_UNLINK flag removed from the kernel · b375a049
      Alan Stern authored
      
      
      29 July 2005, Cambridge, MA:
      
      This afternoon Alan Stern submitted a patch to remove the URB_ASYNC_UNLINK
      flag from the Linux kernel.  Mr. Stern explained, "This flag is a relic
      from an earlier, less-well-designed system.  For over a year it hasn't
      been used for anything other than printing warning messages."
      
      An anonymous spokesman for the Linux kernel development community
      commented, "This is exactly the sort of thing we see happening all the
      time.  As the kernel evolves, support for old techniques and old code can
      be jettisoned and replaced by newer, better approaches.  Proprietary
      operating systems do not have the freedom or flexibility to change so
      quickly."
      
      Mr. Stern, a staff member at Harvard University's Rowland Institute who
      works on Linux only as a hobby, noted that the patch (labelled as548) did
      not update two files, keyspan.c and option.c, in the USB drivers' "serial"
      subdirectory.  "Those files need more extensive changes," he remarked.
      "They examine the status field of several URBs at times when they're not
      supposed to.  That will need to be fixed before the URB_ASYNC_UNLINK flag
      is removed."
      
      Greg Kroah-Hartman, the kernel maintainer responsible for overseeing all
      of Linux's USB drivers, did not respond to our inquiries or return our
      calls.  His only comment was "Applied, thanks."
      Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      b375a049
  14. 29 Jul, 2005 1 commit
  15. 26 Jun, 2005 1 commit
  16. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4