iwlwifi: allow to zero SRAM

Sending a NULL pointer to iwl_trans_write_mem allows now
to zero SRAM.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h
index b0d5c715ca1e..55a140ade5a7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans.h
@@ -391,7 +391,8 @@ struct iwl_trans;
  * @read_prph: read a DWORD from a periphery register
  * @write_prph: write a DWORD to a periphery register
  * @read_mem: read device's SRAM in DWORD
- * @write_mem: write device's SRAM in DWORD
+ * @write_mem: write device's SRAM in DWORD. If %buf is %NULL, then the memory
+ *      will be zeroed.
  * @configure: configure parameters required by the transport layer from
  *      the op_mode. May be called several times before start_fw, can't be
  *      called after that.
diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index 2de5770de64b..4028c03eff5f 100644
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -815,7 +815,8 @@ static int iwl_trans_pcie_write_mem(struct iwl_trans *trans, u32 addr,
         if (iwl_trans_grab_nic_access(trans, false)) {
                 iwl_write32(trans, HBUS_TARG_MEM_WADDR, addr);
                 for (offs = 0; offs < dwords; offs++)
-                        iwl_write32(trans, HBUS_TARG_MEM_WDAT, vals[offs]);
+                        iwl_write32(trans, HBUS_TARG_MEM_WDAT,
+                                    vals ? vals[offs] : 0);
                 iwl_trans_release_nic_access(trans);
         } else {
                 ret = -EBUSY;