defxx: Handle DMA mapping errors

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This adds error handling for DMA mapping requests; I think there isn't
much else to say about it.

A good side-effect is the mapping in the transmit path is now made with
the board lock released.  Also if DMA mapping fails for a newly
allocated receive buffer, then data from the old buffer will be copied
out (as is presently done for small frames only whose size does not
exceed SKBUFF_RX_COPYBREAK) and the original buffer returned, with its
mapping unchanged, to the DMA descriptor ring.

Reported-by: Robert Coerver <Robert.Coerver@ll.mit.edu>
Tested-by: Robert Coerver <Robert.Coerver@ll.mit.edu>
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Maciej W. Rozycki 2014-07-05 15:14:40 +01:00 • committed by David S. Miller

parent a630be7077

commit b37cccf031

1 changed files with 58 additions and 26 deletions

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84

drivers/net/fddi/defxx.c

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