[lwip-devel] [bug #21433] Calling mem_free/pbuf_free from interrupt context isn't safe

[Simon Goldschmidt]

URL:
  <http://savannah.nongnu.org/bugs/?21433>

                 Summary: Calling mem_free/pbuf_free from interrupt context
isn't safe
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Donnerstag 25.10.2007 um 19:14
                Category: pbufs
                Severity: 3 - Normal
              Item Group: Change Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 

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Details:

As discussed on lwip-users on the 25th of october, PBUF_RAM pbufs may not be
freed from interrupt context since mem_free is only protected by a semaphore
(or not at all if NO_SYS==1) see
http://lists.nongnu.org/archive/html/lwip-users/2007-10/msg00116.html and
replies.

Question is: do we want to allow pbuf_free from interrupt context? If not, we
should explicitly document this implementation requirement!

(If someone asked me, I'd vote for allowing to free a pbuf from interrupt
context :)




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