mwlwifi: fix compile problem with kernel 4.14

vfs_write() is not exported on kernel 4.14 any more and kernel_write()
should be used instead.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/package/kernel/mwlwifi/patches/001-remove-vfs_write.patch b/package/kernel/mwlwifi/patches/001-remove-vfs_write.patch
new file mode 100644 (file)
index 0000000..9703d1d
--- /dev/null
+++ b/package/kernel/mwlwifi/patches/001-remove-vfs_write.patch
@@ -0,0 +1,92 @@
+--- a/debugfs.c
++++ b/debugfs.c
+@@ -279,7 +279,6 @@ static void core_dump_file(u8 *valbuf, u
+                          u32 append, u32 totallen, bool textmode)
+ {
+       struct file *filp_core = NULL;
+-      mm_segment_t oldfs;
+       char file_name[40];
+       u8 *buf = kmalloc(length * 3, GFP_KERNEL);
+       u8 *data_p = buf;
+@@ -292,9 +291,6 @@ static void core_dump_file(u8 *valbuf, u
+       sprintf(file_name, "/dev/shm/coredump-%x-%x",
+               region, (region + totallen));
+ 
+-      oldfs = get_fs();
+-      set_fs(KERNEL_DS);
+-
+       if (append)
+               filp_core = filp_open(file_name, O_RDWR | O_APPEND, 0);
+       else
+@@ -317,15 +313,15 @@ static void core_dump_file(u8 *valbuf, u
+                       }
+                       data_p = buf + j;
+                       data_p += sprintf(data_p, "\n");
+-                      vfs_write(filp_core, buf, strlen(buf),
+-                                &filp_core->f_pos);
++                      kernel_write(filp_core, buf, strlen(buf),
++                                   &filp_core->f_pos);
+               } else
+-                      vfs_write(filp_core, valbuf, length, &filp_core->f_pos);
++                      kernel_write(filp_core, valbuf, length,
++                                   &filp_core->f_pos);
+ 
+               filp_close(filp_core, current->files);
+       }
+ 
+-      set_fs(oldfs);
+       kfree(buf);
+ }
+ 
+@@ -1338,7 +1334,6 @@ static ssize_t mwl_debugfs_ba_hist_read(
+       u8 bmap0flag, nobaflag;
+       char buff[500], file_location[20];
+       struct file *filp_bahisto;
+-      mm_segment_t oldfs;
+       u8 *data_p = buff;
+       ssize_t ret;
+ 
+@@ -1354,13 +1349,10 @@ static ssize_t mwl_debugfs_ba_hist_read(
+       memset(file_location, 0, sizeof(file_location));
+       sprintf(file_location, "/tmp/ba_histo-%d", priv->ba_aid);
+ 
+-      oldfs = get_fs();
+-      set_fs(KERNEL_DS);
+       filp_bahisto = filp_open(file_location,
+                                O_RDWR | O_CREAT | O_TRUNC, 0);
+ 
+       if (IS_ERR(filp_bahisto)) {
+-              set_fs(oldfs);
+               ret = -EIO;
+               goto err;
+       }
+@@ -1401,8 +1393,8 @@ static ssize_t mwl_debugfs_ba_hist_read(
+ 
+                       /* Buffer is full. Write to file and reset buf */
+                       if ((strlen(buff) + 36) >= 500) {
+-                              vfs_write(filp_bahisto, buff, strlen(buff),
+-                                        &filp_bahisto->f_pos);
++                              kernel_write(filp_bahisto, buff, strlen(buff),
++                                           &filp_bahisto->f_pos);
+                               mdelay(2);
+                               memset(buff, 0, sizeof(buff));
+                               data_p = buff;
+@@ -1426,8 +1418,8 @@ static ssize_t mwl_debugfs_ba_hist_read(
+                               data_p += sprintf(data_p, "%8d\n", nobaflag);
+               }
+ 
+-              vfs_write(filp_bahisto, buff, strlen(buff),
+-                        &filp_bahisto->f_pos);
++              kernel_write(filp_bahisto, buff, strlen(buff),
++                           &filp_bahisto->f_pos);
+               len += scnprintf(p + len, size - len,
+                                "hole: %d, expect: %d, bmap0: %d, noba: %d\n",
+                                baholecnt, baexpcnt, bmap0cnt, nobacnt);
+@@ -1440,7 +1432,6 @@ static ssize_t mwl_debugfs_ba_hist_read(
+                                priv->ba_aid);
+ 
+       filp_close(filp_bahisto, current->files);
+-      set_fs(oldfs);
+ 
+       ret = simple_read_from_buffer(ubuf, count, ppos, p, len);
+