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Commit e623a48e authored by Håkon Bugge's avatar Håkon Bugge Committed by David S. Miller
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rds: Make sure updates to cp_send_gen can be observed



cp->cp_send_gen is treated as a normal variable, although it may be
used by different threads.

This is fixed by using {READ,WRITE}_ONCE when it is incremented and
READ_ONCE when it is read outside the {acquire,release}_in_xmit
protection.

Normative reference from the Linux-Kernel Memory Model:

    Loads from and stores to shared (but non-atomic) variables should
    be protected with the READ_ONCE(), WRITE_ONCE(), and
    ACCESS_ONCE().

Clause 5.1.2.4/25 in the C standard is also relevant.

Signed-off-by: default avatarHåkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: default avatarKnut Omang <knut.omang@oracle.com>
Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 070f9c65
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