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[lwip-users] RE: [lwip] free-ing of pbufs in netif->output function: wh
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From: |
Lieverse, Paul |
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Subject: |
[lwip-users] RE: [lwip] free-ing of pbufs in netif->output function: who's res ponsible? |
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Date: |
Thu, 09 Jan 2003 00:15:16 -0000 |
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* Mumtaz Ahmad wrote:
> I think pbufs are always deallocated after calling
> low_level_output(ethernetif, q); in ethernetif.c
True, but that's only the q allocated for the ARP request. (lines 237 -
240).
However, in line 258 it says:
return low_level_output(ethernetif, p);
So no pbuf_free() there.
Any pbuf that may have been allocated (line 190) and chained to p (lines
198 and 199) before is thus never deallocated.
The same holds for cs8900if.c, tapif.c, and tunif.c.
> please see the code again
I did, but I'm still left with the same questions I'm afraid :-(
Paul
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<TITLE>RE: [lwip] free-ing of pbufs in netif->output function: who's =
responsible?</TITLE>
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<P><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">* Mumtaz Ahmad =
wrote:</FONT><FONT FACE=3D"Arial">=A0</FONT>
<BR><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">> I</FONT> <FONT =
SIZE=3D2 FACE=3D"Arial">think pbufs are always deallocated after =
calling=A0=A0=A0</FONT>
<BR><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">> l</FONT><FONT =
SIZE=3D2 FACE=3D"Arial">ow_level_output(ethernetif, q); in =
ethernetif.c</FONT>
</P>
<P><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">True, but that's =
only the q allocated for the ARP request. (lines 237 - =
240).</FONT>
</P>
<P><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">However, in line 258 =
it says:</FONT>
<BR><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial"> =
return low_level_output(ethernetif, p);</FONT>
<BR><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">So no pbuf_free() =
there.</FONT>
<BR><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">Any pbuf that may =
have been allocated (line 190) and chained to p (lines</FONT>
<BR><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">198 and 199) before =
is thus never deallocated.</FONT>
</P>
<P><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">The same holds for =
cs8900if.c, tapif.c, and tunif.c.</FONT>
</P>
<P><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">></FONT> <FONT =
SIZE=3D2 FACE=3D"Arial">please see the code again</FONT>
</P>
<P><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">I did, but I'm still =
left with the same questions I'm afraid :-(</FONT>
</P>
<P><FONT COLOR=3D"#000000" SIZE=3D2 FACE=3D"Arial">Paul</FONT>
</P>
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Lieverse, Paul <=