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author | Ben Hutchings <ben@decadent.org.uk> | 2010-09-06 18:28:56 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2010-09-07 13:57:22 -0700 |
commit | 89b12faba4f3441c9457c5278851e8a93ffd008d (patch) | |
tree | fa7af4864a3200a7abcadea2a04886515249d326 /usr/.gitignore | |
parent | 1ee89bd0fe72e381c8e4ef887d53c19c8adc6c93 (diff) | |
download | op-kernel-dev-89b12faba4f3441c9457c5278851e8a93ffd008d.zip op-kernel-dev-89b12faba4f3441c9457c5278851e8a93ffd008d.tar.gz |
3c59x: Fix deadlock in vortex_error()
This fixes a bug introduced in commit
de847272149365363a6043a963a6f42fb91566e2
"3c59x: Use fine-grained locks for MII and windowed register access".
vortex_interrupt() holds vp->window_lock over multiple register
accesses to reduce locking overhead. However it also needs to call
vortex_error() sometimes, and that uses the regular functions for
access to windowed registers, which will try to acquire window_lock
again.
Therefore, drop window_lock around the call to vortex_error() and set
the window afterward reacquiring the lock. Since vortex_error() may
call vortex_rx(), which *does* require its caller to hold window_lock,
lift that call up into vortex_interrupt(). This also removes the
potential for calling vortex_rx() on a later-generation NIC.
Reported-and-tested-by: Jens Schüßler <jgs@trash.net> [in Debian's 2.6.32]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'usr/.gitignore')
0 files changed, 0 insertions, 0 deletions