diff mbox series

[for-4.0,v3,2/4] refactor load_image_size

Message ID 1543848532-12604-3-git-send-email-lizhijian@cn.fujitsu.com
State New
Headers show
Series allow to load initrd below 4G for recent kernel | expand

Commit Message

Li Zhijian Dec. 3, 2018, 2:48 p.m. UTC 
Don't expect read(2) can always read as many as it's told.

Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
---
 hw/core/loader.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

Comments

Richard Henderson Dec. 3, 2018, 4:43 p.m. UTC | #1 
On 12/3/18 8:48 AM, Li Zhijian wrote:
> Don't expect read(2) can always read as many as it's told.
> 
> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
> ---
>  hw/core/loader.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~
diff mbox series

Patch

diff --git a/hw/core/loader.c b/hw/core/loader.c
index fa41842..9cbceab 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -77,21 +77,20 @@  int64_t get_image_size(const char *filename)
 ssize_t load_image_size(const char *filename, void *addr, size_t size)
 {
     int fd;
-    ssize_t actsize;
+    ssize_t actsize, l = 0;
 
     fd = open(filename, O_RDONLY | O_BINARY);
     if (fd < 0) {
         return -1;
     }
 
-    actsize = read(fd, addr, size);
-    if (actsize < 0) {
-        close(fd);
-        return -1;
+    while ((actsize = read(fd, addr + l, size - l)) > 0) {
+        l += actsize;
     }
+
     close(fd);
 
-    return actsize;
+    return actsize < 0 ? -1 : l;
 }
 
 /* read()-like version */