can: mcp251x: Move to threaded interrupts instead of workqueues.

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This patch addresses concerns about efficiency of handling incoming
packets. Handling of interrupts is done in a threaded interrupt handler
which has a smaller latency than workqueues. This change needed a rework
of the locking scheme that was much simplified. Some other (more or less
longstanding) bugs are fixed: utilization of just half of the RX
buffers, useless wait for interrupt on open, more reliable reset
sequence. The MERR interrupt is not used anymore: it overloads the CPU
in error-passive state without any additional information. One shot mode
is disabled because it's not clear if it can be handled efficiently on
this CAN controller.

Signed-off-by: Christian Pellegrin <chripell@fsfe.org>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Christian Pellegrin

2010-02-03 07:39:54 +00:00

committed by David S. Miller

parent 35cfabdc5e

commit bf66f3736a

1 changed files with 204 additions and 219 deletions

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423

drivers/net/can/mcp251x.c

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