bcmdhd: do not turn off mmc at probe
[linux-2.6.git] / lib / scatterlist.c
index 9afa25b..4ceb05d 100644 (file)
@@ -10,6 +10,7 @@
 #include <linux/slab.h>
 #include <linux/scatterlist.h>
 #include <linux/highmem.h>
+#include <linux/kmemleak.h>
 
 /**
  * sg_next - return the next scatterlist entry in a list
@@ -115,17 +116,29 @@ EXPORT_SYMBOL(sg_init_one);
  */
 static struct scatterlist *sg_kmalloc(unsigned int nents, gfp_t gfp_mask)
 {
-       if (nents == SG_MAX_SINGLE_ALLOC)
-               return (struct scatterlist *) __get_free_page(gfp_mask);
-       else
+       if (nents == SG_MAX_SINGLE_ALLOC) {
+               /*
+                * Kmemleak doesn't track page allocations as they are not
+                * commonly used (in a raw form) for kernel data structures.
+                * As we chain together a list of pages and then a normal
+                * kmalloc (tracked by kmemleak), in order to for that last
+                * allocation not to become decoupled (and thus a
+                * false-positive) we need to inform kmemleak of all the
+                * intermediate allocations.
+                */
+               void *ptr = (void *) __get_free_page(gfp_mask);
+               kmemleak_alloc(ptr, PAGE_SIZE, 1, gfp_mask);
+               return ptr;
+       } else
                return kmalloc(nents * sizeof(struct scatterlist), gfp_mask);
 }
 
 static void sg_kfree(struct scatterlist *sg, unsigned int nents)
 {
-       if (nents == SG_MAX_SINGLE_ALLOC)
+       if (nents == SG_MAX_SINGLE_ALLOC) {
+               kmemleak_free(sg);
                free_page((unsigned long) sg);
-       else
+       } else
                kfree(sg);
 }
 
@@ -235,8 +248,18 @@ int __sg_alloc_table(struct sg_table *table, unsigned int nents,
                left -= sg_size;
 
                sg = alloc_fn(alloc_size, gfp_mask);
-               if (unlikely(!sg))
-                       return -ENOMEM;
+               if (unlikely(!sg)) {
+                       /*
+                        * Adjust entry count to reflect that the last
+                        * entry of the previous table won't be used for
+                        * linkage.  Without this, sg_kfree() may get
+                        * confused.
+                        */
+                       if (prv)
+                               table->nents = ++table->orig_nents;
+
+                       return -ENOMEM;
+               }
 
                sg_init_table(sg, alloc_size);
                table->nents = table->orig_nents += sg_size;