[ofa-general] [PATCH 08/23] IB/ipath - future proof eeprom checksum code (contents reading)

[Arthur Jones]

From: Dave Olson <dave.olson at qlogic.com>

In an earlier change, the amount of data read from the flash was
mistakenly limited to the size known to the current driver.  This
causes problems when the length is increased, and written with the
new longer version; the checksum would fail because not enough data
was read.  Always read the full 128 byte length to prevent this.

Signed-off-by: Dave Olson <dave.olson at qlogic.com>
---

 drivers/infiniband/hw/ipath/ipath_eeprom.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/ipath/ipath_eeprom.c b/drivers/infiniband/hw/ipath/ipath_eeprom.c
index b4503e9..bcfa3cc 100644
--- a/drivers/infiniband/hw/ipath/ipath_eeprom.c
+++ b/drivers/infiniband/hw/ipath/ipath_eeprom.c
@@ -596,7 +596,11 @@ void ipath_get_eeprom_info(struct ipath_devdata *dd)
 		goto bail;
 	}
 
-	len = offsetof(struct ipath_flash, if_future);
+	/*
+	 * read full flash, not just currently used part, since it may have
+	 * been written with a newer definition
+	 * */
+	len = sizeof(struct ipath_flash);
 	buf = vmalloc(len);
 	if (!buf) {
 		ipath_dev_err(dd, "Couldn't allocate memory to read %u "
@@ -737,8 +741,10 @@ int ipath_update_eeprom_log(struct ipath_devdata *dd)
 	/*
 	 * The quick-check above determined that there is something worthy
 	 * of logging, so get current contents and do a more detailed idea.
+	 * read full flash, not just currently used part, since it may have
+	 * been written with a newer definition
 	 */
-	len = offsetof(struct ipath_flash, if_future);
+	len = sizeof(struct ipath_flash);
 	buf = vmalloc(len);
 	ret = 1;
 	if (!buf) {