[Qemu-devel] [PATCH] Check block driver read error in pflash_cfi0x

[Qemu-devel] [PATCH] Check block driver read error in pflash_cfi0x

[Vijay Kumar]

If a flash file of size smaller than the flash size is specified in
the -pflash option, the block driver returns error. But the
pflash_cfi0x ignores the error. This results in a flash content of all
zeroes. And the simulation aborts while executing code.

This patch adds the checks for errors from bdrv_read and escalates it
to the calling code.

Signed-off-by: Vijay Kumar B. <vijaykumar@bravegnu.org>

Index: qemu/hw/pflash_cfi01.c
===================================================================
--- qemu.orig/hw/pflash_cfi01.c	2009-08-21 09:12:59.000000000 +0530
+++ qemu/hw/pflash_cfi01.c	2009-08-21 10:19:34.000000000 +0530
@@ -507,6 +507,7 @@
 {
     pflash_t *pfl;
     target_phys_addr_t total_len;
+    int ret;
 
     total_len = sector_len * nb_blocs;
 
@@ -530,7 +531,12 @@
     pfl->bs = bs;
     if (pfl->bs) {
         /* read the initial flash content */
-        bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
+        ret = bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
+        if (ret < 0) {
+            cpu_unregister_io_memory(pfl->fl_mem);
+            qemu_free(pfl);
+            return NULL;
+        }
     }
 #if 0 /* XXX: there should be a bit to set up read-only,
        *      the same way the hardware does (with WP pin).
Index: qemu/hw/pflash_cfi02.c
===================================================================
--- qemu.orig/hw/pflash_cfi02.c	2009-08-21 09:39:04.000000000 +0530
+++ qemu/hw/pflash_cfi02.c	2009-08-21 10:19:42.000000000 +0530
@@ -547,6 +547,7 @@
 {
     pflash_t *pfl;
     int32_t chip_len;
+    int ret;
 
     chip_len = sector_len * nb_blocs;
     /* XXX: to be fixed */
@@ -568,7 +569,12 @@
     pfl->bs = bs;
     if (pfl->bs) {
         /* read the initial flash content */
-        bdrv_read(pfl->bs, 0, pfl->storage, chip_len >> 9);
+        ret = bdrv_read(pfl->bs, 0, pfl->storage, chip_len >> 9);
+        if (ret < 0) {
+            cpu_unregister_io_memory(pfl->fl_mem);
+            qemu_free(pfl);
+            return NULL;
+        }
     }
 #if 0 /* XXX: there should be a bit to set up read-only,
        *      the same way the hardware does (with WP pin).

Re: [Qemu-devel] [PATCH] Check block driver read error in pflash_cfi0x

[andrzej zaborowski]

2009/8/21 Vijay Kumar <vijaykumar@bravegnu.org>:
> If a flash file of size smaller than the flash size is specified in
> the -pflash option, the block driver returns error. But the
> pflash_cfi0x ignores the error. This results in a flash content of all
> zeroes. And the simulation aborts while executing code.
>
> This patch adds the checks for errors from bdrv_read and escalates it
> to the calling code.

Maybe it should print a message indicating the expected size and exit?

Cheers