linux-kernel - [PATCH 127/150] sfc: Fix MCDI structure field lookup

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Message-Id: <1364311249-14454-128-git-send-email-luis.henriques@canonical.com>
Date:	Tue, 26 Mar 2013 15:20:26 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 127/150] sfc: Fix MCDI structure field lookup

3.5.7.9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <bhutchings@...arflare.com>

commit 0a6e5008a9df678b48f8d4e57601aa4270df6c14 upstream.

The least significant bit number (LBN) of a field within an MCDI
structure is counted from the start of the structure, not the
containing dword.  In MCDI_ARRAY_FIELD() we need to mask it rather
than using the usual EFX_DWORD_FIELD() macro.

Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/net/ethernet/sfc/mcdi.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/mcdi.h b/drivers/net/ethernet/sfc/mcdi.h
index 0bdf3e3..96f43d2 100644
--- a/drivers/net/ethernet/sfc/mcdi.h
+++ b/drivers/net/ethernet/sfc/mcdi.h
@@ -107,11 +107,13 @@ extern void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev);
 #define MCDI_EVENT_FIELD(_ev, _field)			\
 	EFX_QWORD_FIELD(_ev, MCDI_EVENT_ ## _field)
 #define MCDI_ARRAY_FIELD(_buf, _field1, _type, _index, _field2)		\
-	EFX_DWORD_FIELD(						\
+	EFX_EXTRACT_DWORD(						\
 		*((efx_dword_t *)					\
 		  (MCDI_ARRAY_PTR(_buf, _field1, _type, _index) +	\
 		   (MC_CMD_ ## _type ## _TYPEDEF_ ## _field2 ## _OFST & ~3))), \
-		MC_CMD_ ## _type ## _TYPEDEF_ ## _field2)
+		MC_CMD_ ## _type ## _TYPEDEF_ ## _field2 ## _LBN & 0x1f, \
+		(MC_CMD_ ## _type ## _TYPEDEF_ ## _field2 ## _LBN & 0x1f) + \
+		MC_CMD_ ## _type ## _TYPEDEF_ ## _field2 ## _WIDTH - 1)
 
 extern void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len);
 extern int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
-- 
1.8.1.2

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