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  1. 19 11月, 2011 6 次提交
    • A
      USB: make the usbfs memory limit configurable · 3f5eb8d5
      由 Alan Stern 提交于 
      The 16-MB global limit on memory used by usbfs isn't suitable for all
people.  It's a reasonable default, but there are applications
(especially for SuperSpeed devices) that need a lot more.

This patch (as1498) creates a writable module parameter for usbcore to
control the global limit.  The default is still 16 MB, but users can
change it at runtime, even after usbcore has been loaded.  As a
special case, setting the value to 0 is treated the same as the hard
limit of 2047 MB.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      3f5eb8d5
    • A
      USB: change the memory limits in usbfs URB submission · add1aaea
      由 Alan Stern 提交于 
      For a long time people have complained about the limitations imposed
by usbfs.  URBs coming from userspace are not allowed to have transfer
buffers larger than a more-or-less arbitrary maximum.

While it is generally a good idea to avoid large transfer buffers
(because the data has to be bounced to/from a contiguous kernel-space
buffer), it's not the kernel's job to enforce such limits.  Programs
should be allowed to submit URBs as large as they like; if there isn't
sufficient contiguous memory available then the submission will fail
with a simple ENOMEM error.

On the other hand, we would like to prevent programs from submitting a
lot of small URBs and using up all the DMA-able kernel memory.  To
that end, this patch (as1497) replaces the old limits on individual
transfer buffers with a single global limit on the total amount of
memory in use by usbfs.  The global limit is set to 16 MB as a nice
compromise value: not too big, but large enough to hold about 300 ms
of data for high-speed transfers.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      add1aaea
    • A
      USB: unify some error pathways in usbfs · 52fb743d
      由 Alan Stern 提交于 
      This patch (as1496) unifies the error-return pathways of several
functions in the usbfs driver.  This is not a very important change by
itself; it merely prepares the way for the next patch in this series.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      52fb743d
    • A
      USB: remove homegrown UTF conversion routine for gadgets · 86dc243c
      由 Alan Stern 提交于 
      This patch (as1502) removes the UTF8-to-UTF16 conversion routine in
the USB gadget library and replaces it with a call to the equivalent
function in the NLS library.

The only downside worth noting is that the NLS library routine
requires the output buffer to be 16-bit aligned.  This is always true
in the gadget code, because the output buffer is always a
usb_request buffer being used to send a string descriptor.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      86dc243c
    • A
      NLS: improve UTF8 -> UTF16 string conversion routine · 0720a06a
      由 Alan Stern 提交于 
      The utf8s_to_utf16s conversion routine needs to be improved.  Unlike
its utf16s_to_utf8s sibling, it doesn't accept arguments specifying
the maximum length of the output buffer or the endianness of its
16-bit output.

This patch (as1501) adds the two missing arguments, and adjusts the
only two places in the kernel where the function is called.  A
follow-on patch will add a third caller that does utilize the new
capabilities.

The two conversion routines are still annoyingly inconsistent in the
way they handle invalid byte combinations.  But that's a subject for a
different patch.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
CC: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      0720a06a
    • A
      OHCI: remove uses of hcd->state · b7463c71
      由 Alan Stern 提交于 
      This patch (as1500) removes all uses of the objectionable hcd->state
variable from the ohci-hcd family of drivers.  It is replaced by a
private ohci->rh_state field, just as in uhci-hcd and ehci-hcd.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      b7463c71
  3. 16 11月, 2011 34 次提交