iwlwifi: by default, dump entire sram data portion

For "sram" debugfs file, if user did not specify the offset and length,
dump the entire data portion of sram by default.
Data portion is 0x800000 - 0x80ffff, but the actual data size is known
to the driver from the ucode file.
Signed-off-by: NWey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: NReinette Chatre <reinette.chatre@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-debugfs.c

@@ -235,13 +235,21 @@ static ssize_t iwl_dbgfs_sram_read(struct file *file,
 	struct iwl_priv *priv = (struct iwl_priv *)file->private_data;
 	size_t bufsz;
 
-	bufsz =  30 + priv->dbgfs->sram_len * sizeof(char) * 12;
+	/* default is to dump the entire data segment */
+	if (!priv->dbgfs->sram_offset && !priv->dbgfs->sram_len) {
+		priv->dbgfs->sram_offset = 0x800000;
+		if (priv->ucode_type == UCODE_INIT)
+			priv->dbgfs->sram_len = priv->ucode_init_data.len;
+		else
+			priv->dbgfs->sram_len = priv->ucode_data.len;
+	}
+	bufsz =  30 + priv->dbgfs->sram_len * sizeof(char) * 10;
 	buf = kmalloc(bufsz, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
-	pos += scnprintf(buf + pos, bufsz - pos, "sram_len: %d\n",
+	pos += scnprintf(buf + pos, bufsz - pos, "sram_len: 0x%x\n",
 			priv->dbgfs->sram_len);
-	pos += scnprintf(buf + pos, bufsz - pos, "sram_offset: %d\n",
+	pos += scnprintf(buf + pos, bufsz - pos, "sram_offset: 0x%x\n",
 			priv->dbgfs->sram_offset);
 	for (i = priv->dbgfs->sram_len; i > 0; i -= 4) {
 		val = iwl_read_targ_mem(priv, priv->dbgfs->sram_offset + \