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bdev: prevent early spdk_bdev_init_complete()

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In case some module has `async_init = true` and
  some other module that comes after it fails to initialize,
  then callback from asynchronously initialized module
  may call `spdk_bdev_init_complete()` first, then failed module
  will call `spdk_bdev_init_complete()` later.
  This currently results in NULL dereference because
  first call to `spdk_bdev_init_complete()` sets `g_init_cb_fn = NULL`.

This change prevents first call to `spdk_bdev_init_complete()`
  by saying that failed module is not finished with initialization.

This patch fixes #847

Change-Id: Ib6b231d5ea27896ad88d7f11b8732921077b3d4d
Signed-off-by: Vitaliy Mysak <vitaliy.mysak@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/461230
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
This commit is contained in:
Vitaliy Mysak 2019-07-05 22:12:01 +00:00 committed by Darek Stojaczyk
parent 0b3fb2403e
commit 6b654ab900
1 changed files with 13 additions and 7 deletions
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20
lib/bdev/bdev.c
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@ -940,6 +940,15 @@ spdk_bdev_module_examine_done(struct spdk_bdev_module *module)
/** The last initialized bdev module */
static struct spdk_bdev_module *g_resume_bdev_module = NULL;
static void
spdk_bdev_init_failed(void *cb_arg)
{
struct spdk_bdev_module *module = cb_arg;
module->internal.action_in_progress--;
spdk_bdev_init_complete(-1);
}
static int
spdk_bdev_modules_init(void)
{
@ -953,6 +962,10 @@ spdk_bdev_modules_init(void)
}
rc = module->module_init();
if (rc != 0) {
/* Bump action_in_progress to prevent other modules from completion of modules_init
* Send message to defer application shutdown until resources are cleaned up */
module->internal.action_in_progress = 1;
spdk_thread_send_msg(spdk_get_thread(), spdk_bdev_init_failed, module);
return rc;
}
}
@ -961,12 +974,6 @@ spdk_bdev_modules_init(void)
return 0;
}
static void
spdk_bdev_init_failed(void *cb_arg)
{
spdk_bdev_init_complete(-1);
}
void
spdk_bdev_initialize(spdk_bdev_init_cb cb_fn, void *cb_arg)
{
@ -1078,7 +1085,6 @@ spdk_bdev_initialize(spdk_bdev_init_cb cb_fn, void *cb_arg)
g_bdev_mgr.module_init_complete = true;
if (rc != 0) {
SPDK_ERRLOG("bdev modules init failed\n");
spdk_thread_send_msg(spdk_get_thread(), spdk_bdev_init_failed, NULL);
return;
}