Fix error handling with malloc, memalign etc. Introduce xmemalign().

The idea is to panic() when there is no memory available for normal
operation. Exception: code which can consume arbitrary amount of RAM
(example: files allocated in ramfs) must report error instead of panic().

This patch also fixes code which didn't check for NULL from malloc() etc.

Usage: malloc(), memalign() return NULL when out of RAM.
xmalloc(), xmemalign() always return non-NULL or panic().

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/xfuncs.c b/lib/xfuncs.c
index 01a64cf5eb..71394fff29 100644
--- a/lib/xfuncs.c
+++ b/lib/xfuncs.c
@@ -70,3 +70,11 @@ char *xstrdup(const char *s)
 }
 EXPORT_SYMBOL(xstrdup);
 
+void* xmemalign(size_t alignment, size_t bytes)
+{
+	void *p = memalign(alignment, bytes);
+	if (!p)
+		panic("ERROR: out of memory\n");
+	return p;
+}
+EXPORT_SYMBOL(xmemalign);