bch:alloc bch->buffer when offset not aligned

Signed-off-by: guohao15 <[email protected]>

Author: guohao15

drivers/bch/bchlib_cache.c

@@ -23,6 +23,7 @@
  ****************************************************************************/
 
 #include <nuttx/config.h>
+#include <nuttx/kmalloc.h>
 
 #include <sys/types.h>
 #include <stdbool.h>
@@ -112,7 +113,7 @@ int bchlib_flushsector(FAR struct bchlib_s *bch, bool discard)
    * media.
    */
 
-  if (bch->dirty)
+  if (bch->dirty && bch->buffer != NULL)
     {
       inode = bch->inode;
 
@@ -168,6 +169,20 @@ int bchlib_readsector(FAR struct bchlib_s *bch, size_t sector)
   FAR struct inode *inode;
   ssize_t ret = OK;
 
+  if (bch->buffer == NULL)
+    {
+#if CONFIG_BCH_BUFFER_ALIGNMENT != 0
+      bch->buffer = kmm_memalign(CONFIG_BCH_BUFFER_ALIGNMENT, bch->sectsize);
+#else
+      bch->buffer = kmm_malloc(bch->sectsize);
+#endif
+      if (bch->buffer == NULL)
+        {
+          ferr("Failed to allocate sector buffer\n");
+          return -ENOMEM;
+        }
+    }
+
   if (bch->sector != sector)
     {
       inode = bch->inode;

drivers/bch/bchlib_setup.c

@@ -110,21 +110,6 @@ int bchlib_setup(const char *blkdev, bool readonly, FAR void **handle)
   bch->sectsize = geo.geo_sectorsize;
   bch->sector   = (size_t)-1;
   bch->readonly = readonly;
-
-  /* Allocate the sector I/O buffer */
-
-#if CONFIG_BCH_BUFFER_ALIGNMENT != 0
-  bch->buffer = kmm_memalign(CONFIG_BCH_BUFFER_ALIGNMENT, bch->sectsize);
-#else
-  bch->buffer = kmm_malloc(bch->sectsize);
-#endif
-  if (!bch->buffer)
-    {
-      ferr("ERROR: Failed to allocate sector buffer\n");
-      ret = -ENOMEM;
-      goto errout_with_bch;
-    }
-
   *handle = bch;
   return OK;