iwlwifi: reduce stack size

Reduce stack memory footprint of iwlwifi.
(From >1000 bytes for each *_table_read
on i386 down to 32)

Signed-off-by: Frank Seidel <frank@f-seidel.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 19 insertions, 4 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index 04b42c8a7705..99da40678878 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -2520,12 +2520,17 @@ static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
                         char __user *user_buf, size_t count, loff_t *ppos)
 {
-        char buff[1024];
+        char *buff;
         int desc = 0;
         int i = 0;
+        ssize_t ret;
 
         struct iwl_lq_sta *lq_sta = file->private_data;
 
+        buff = kmalloc(1024, GFP_KERNEL);
+        if (!buff)
+                return -ENOMEM;
+
         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
                         lq_sta->total_failed, lq_sta->total_success,
@@ -2557,7 +2562,9 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
 
-        return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
+        ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
+        kfree(buff);
+        return ret;
 }
 
 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
@@ -2568,11 +2575,17 @@ static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
                         char __user *user_buf, size_t count, loff_t *ppos)
 {
-        char buff[1024];
+        char *buff;
         int desc = 0;
         int i, j;
+        ssize_t ret;
 
         struct iwl_lq_sta *lq_sta = file->private_data;
+
+        buff = kmalloc(1024, GFP_KERNEL);
+        if (!buff)
+                return -ENOMEM;
+
         for (i = 0; i < LQ_SIZE; i++) {
                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
                                 "rate=0x%X\n",
@@ -2590,7 +2603,9 @@ static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
                                 lq_sta->lq_info[i].win[j].success_ratio);
                 }
         }
-        return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
+        ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
+        kfree(buff);
+        return ret;
 }
 
 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {