[PATCH V2] ocxl: Fix access to the AFU Descriptor Data

[Christophe Lombard]

The AFU Information DVSEC capability is a means to extract common,
general information about all of the AFUs associated with a Function
independent of the specific functionality that each AFU provides.

This patch fixes the access to the AFU Descriptor Data indexed by the
AFU Info Index field.

Fixes: 5ef3166e8a32 ("ocxl: Driver code for 'generic' opencapi devices")
Cc: stable <stable at vger.kernel.org>     # 4.16
Signed-off-by: Christophe Lombard <clombard at linux.vnet.ibm.com>
---
Changelog[v2]
 - Rebase to latest upstream.
 - Use pci_write_config_byte instead of pci_write_config_word
---
 drivers/misc/ocxl/config.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/ocxl/config.c b/drivers/misc/ocxl/config.c
index 2e30de9..57a6bb1 100644
--- a/drivers/misc/ocxl/config.c
+++ b/drivers/misc/ocxl/config.c
@@ -280,7 +280,9 @@ int ocxl_config_check_afu_index(struct pci_dev *dev,
 	u32 val;
 	int rc, templ_major, templ_minor, len;
 
-	pci_write_config_word(dev, fn->dvsec_afu_info_pos, afu_idx);
+	pci_write_config_byte(dev,
+			fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX,
+			afu_idx);
 	rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_VERSION, &val);
 	if (rc)
 		return rc;
-- 
2.7.4