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mtd: Fix compile failure and error path in physmap.c 

Commit 4b56ffcace ("mtd: Fix kernel NULL
pointer dereference in physmap.c") introduced a couple of bugs.

It neglected to run the loop of map_destroy() calls in
physmap_flash_remove(), if !info->cmtd, which would happen if that
function was called to clean up errors during probe.

It also failed to compile if CONFIG_MTD_PARTITIONS was not defined.

Reported-By: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
H Hartley Sweeten 2009-10-20 12:23:33 -04:00 committed by David Woodhouse
parent 1cc523999e
commit 8ce110ac19
1 changed files with 23 additions and 25 deletions
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48
drivers/mtd/maps/physmap.c
View File

@ -44,12 +44,10 @@ static int physmap_flash_remove(struct platform_device *dev)
return 0;
platform_set_drvdata(dev, NULL);
if (info->cmtd == NULL)
return 0;
physmap_data = dev->dev.platform_data;
if (mtd_has_partitions()) {
if (info->cmtd) {
#ifdef CONFIG_MTD_PARTITIONS
if (info->nr_parts || physmap_data->nr_parts) {
del_mtd_partitions(info->cmtd);
@ -58,14 +56,14 @@ static int physmap_flash_remove(struct platform_device *dev)
} else {
del_mtd_device(info->cmtd);
}
} else {
#else
del_mtd_device(info->cmtd);
}
#ifdef CONFIG_MTD_CONCAT
if (info->cmtd != info->mtd[0])
mtd_concat_destroy(info->cmtd);
#endif
#ifdef CONFIG_MTD_CONCAT
if (info->cmtd != info->mtd[0])
mtd_concat_destroy(info->cmtd);
#endif
}
for (i = 0; i < MAX_RESOURCES; i++) {
if (info->mtd[i] != NULL)
@ -170,23 +168,23 @@ static int physmap_flash_probe(struct platform_device *dev)
if (err)
goto err_out;
if (mtd_has_partitions()) {
err = parse_mtd_partitions(info->cmtd, part_probe_types,
&info->parts, 0);
if (err > 0) {
add_mtd_partitions(info->cmtd, info->parts, err);
info->nr_parts = err;
return 0;
}
if (physmap_data->nr_parts) {
printk(KERN_NOTICE "Using physmap partition information\n");
add_mtd_partitions(info->cmtd, physmap_data->parts,
physmap_data->nr_parts);
return 0;
}
#ifdef CONFIG_MTD_PARTITIONS
err = parse_mtd_partitions(info->cmtd, part_probe_types,
&info->parts, 0);
if (err > 0) {
add_mtd_partitions(info->cmtd, info->parts, err);
info->nr_parts = err;
return 0;
}
if (physmap_data->nr_parts) {
printk(KERN_NOTICE "Using physmap partition information\n");
add_mtd_partitions(info->cmtd, physmap_data->parts,
physmap_data->nr_parts);
return 0;
}
#endif
add_mtd_device(info->cmtd);
return 0;