gianfar: convert u64 status counters to atomic64_t

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While looking at some asm dump for an unrelated change, Eric
noticed in the following stats count increment code:

    50b8:       81 3c 01 f8     lwz     r9,504(r28)
    50bc:       81 5c 01 fc     lwz     r10,508(r28)
    50c0:       31 4a 00 01     addic   r10,r10,1
    50c4:       7d 29 01 94     addze   r9,r9
    50c8:       91 3c 01 f8     stw     r9,504(r28)
    50cc:       91 5c 01 fc     stw     r10,508(r28)

that a 64 bit counter was used on ppc-32 without sync
and hence the "ethtool -S" output was racy.

Here we convert all the values to use atomic64_t so that
the output will always be consistent.

Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

...

This commit is contained in:

Paul Gortmaker 2013-02-12 15:38:19 -05:00

parent 68719786cb

commit 212079df6d

3 changed files with 31 additions and 30 deletions

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26

drivers/net/ethernet/freescale/gianfar.c

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31

drivers/net/ethernet/freescale/gianfar.h

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4

drivers/net/ethernet/freescale/gianfar_ethtool.c

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