netdev - [PATCH 4/7] sfc: Clear I2C adapter structure in falcon_remove

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Date:	Wed, 04 Mar 2009 19:53:02 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-net-drivers@...arflare.com
Subject: [PATCH 4/7] sfc: Clear I2C adapter structure in falcon_remove_nic()

i2c_del_adapter() leaves dangling pointers in the structure.  If we
retry the NIC probe and pass the structure to i2c_add_adapter() again
it will lead to an oops unless we clear it first.

Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
---
 drivers/net/sfc/falcon.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
index 9e2f0f0..efd121c 100644
--- a/drivers/net/sfc/falcon.c
+++ b/drivers/net/sfc/falcon.c
@@ -3114,8 +3114,10 @@ void falcon_remove_nic(struct efx_nic *efx)
 	struct falcon_nic_data *nic_data = efx->nic_data;
 	int rc;
 
+	/* Remove I2C adapter and clear it in preparation for a retry */
 	rc = i2c_del_adapter(&efx->i2c_adap);
 	BUG_ON(rc);
+	memset(&efx->i2c_adap, 0, sizeof(efx->i2c_adap));
 
 	falcon_remove_spi_devices(efx);
 	falcon_free_buffer(efx, &efx->irq_status);

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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