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Date: Tue, 6 May 2014 14:49:16 +0200 From: Nikolay Aleksandrov <nikolay@...hat.com> To: netdev@...r.kernel.org Cc: Nikolay Aleksandrov <nikolay@...hat.com>, <linux-net-drivers@...arflare.com>, Shradha Shah <sshah@...arflare.com>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH net] sfc: fix calling of free_irq with 0 argument If the sfc driver is in legacy interrupt mode (either explicitly by using interrupt_mode module param or by falling back to it) it will hit a warning at kernel/irq/manage.c because it will try to free irq 0 in efx_nic_fini_interrupt() since the MSI interrupts were freed always, but in legacy irq mode they're == 0. So fix it by checking if we actually have an interrupt allocated and only then free it. CC: <linux-net-drivers@...arflare.com> CC: Shradha Shah <sshah@...arflare.com> CC: David S. Miller <davem@...emloft.net> Reported-by: Zenghui Shi <zshi@...hat.com> Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com> --- There're other ways to fix this as well, but I chose this one as it follows the logic in the code. Also I saw it used in a few places to check if there's an IRQ allocated for that channel. drivers/net/ethernet/sfc/nic.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/sfc/nic.c b/drivers/net/ethernet/sfc/nic.c index 32d969e857f7..cab627defbc3 100644 --- a/drivers/net/ethernet/sfc/nic.c +++ b/drivers/net/ethernet/sfc/nic.c @@ -158,7 +158,9 @@ void efx_nic_fini_interrupt(struct efx_nic *efx) /* Disable MSI/MSI-X interrupts */ efx_for_each_channel(channel, efx) - free_irq(channel->irq, &efx->msi_context[channel->channel]); + if (channel->irq) + free_irq(channel->irq, + &efx->msi_context[channel->channel]); /* Disable legacy interrupt */ if (efx->legacy_irq) -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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