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authorBen Hutchings <ben@decadent.org.uk>2010-04-07 23:55:47 -0400
committerDavid S. Miller <davem@davemloft.net>2010-04-07 23:55:47 -0400
commitb0cf4dfb7cd21556efd9a6a67edcba0840b4d98d (patch)
tree96e70aaf37b7c35435324c66057be8aa34a7bdff /drivers/net/ewrk3.c
parente31d5a05948e4478ba8396063d1e1f39880928e2 (diff)
3c503: Fix IRQ probing
The driver attempts to select an IRQ for the NIC automatically by testing which of the supported IRQs are available and then probing each available IRQ with probe_irq_{on,off}(). There are obvious race conditions here, besides which: 1. The test for availability is done by passing a NULL handler, which now always returns -EINVAL, thus the device cannot be opened: <http://bugs.debian.org/566522> 2. probe_irq_off() will report only the first ISA IRQ handled, potentially leading to a false negative. There was another bug that meant it ignored all error codes from request_irq() except -EBUSY, so it would 'succeed' despite this (possibly causing conflicts with other ISA devices). This was fixed by ab08999d6029bb2c79c16be5405d63d2bedbdfea 'WARNING: some request_irq() failures ignored in el2_open()', which exposed bug 1. This patch: 1. Replaces the use of probe_irq_{on,off}() with a real interrupt handler 2. Adds a delay before checking the interrupt-seen flag 3. Disables interrupts on all failure paths 4. Distinguishes error codes from the second request_irq() call, consistently with the first Compile-tested only. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ewrk3.c')
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