[Bug 1001858] New: CAN driver return code patch

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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001858

            Bug ID: 1001858
           Summary: CAN driver return code patch
           Product: eCos
           Version: CVS
            Target: All
  Architecture/Host Other
                OS:
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: low
         Component: Patches and contributions
          Assignee: unassigned@bugs.ecos.sourceware.org
          Reporter: uwe_kindler@web.de
                CC: ecos-patches@ecos.sourceware.org

Created attachment 2248
  --> http://bugs.ecos.sourceware.org/attachment.cgi?id=2248&action=edit
CAN driver retuirn code patch

The following patch defines the error code to be returned by
cyg_io_set_config() for the config keys CYG_IO_SET_CONFIG_CAN_RANGE_FILTER and
CYG_IO_SET_CONFIG_CAN_MASK_FILTER if no buffers or filters are available
anymore.

The function shall return -ENOSPC to indicate that there are no filters
available. At the moment the only implementation that uses these keys (LPC2xxx
CAN driver) returns -EPERM. But -EPERM is also returned if it is not possible
to configure filters because message filterings is deactivated
(CYGNUM_CAN_MSGBUF_RX_FILTER_ALL). So with the new return code it is possible
for the application to identify the exact reason why message filter
configuration failed.

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