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scst: Do not suspend SCSI command processing when adding a device

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Since the only global data structure that is modified by the code that adds
a device (scst_dev_list) is consistently protected by scst_mutex, suspending
command processing when adding a device is not necessary.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8025 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2019-03-10 01:10:11 +00:00
parent 46698cc77d
commit 26d7fd0e3a
3 changed files with 3 additions and 12 deletions
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4
scst/src/scst_copy_mgr.c
View File

@@ -2547,7 +2547,6 @@ out:
return res;
}
/* scst_mutex supposed to be held and activities suspended */
static int scst_cm_dev_register(struct scst_device *dev, uint64_t lun)
{
int res, i;
@@ -2556,7 +2555,6 @@ static int scst_cm_dev_register(struct scst_device *dev, uint64_t lun)
TRACE_ENTRY();
scst_assert_activity_suspended();
lockdep_assert_held(&scst_mutex);
TRACE_DBG("dev %s, LUN %ld", dev->virt_name, (unsigned long)lun);
@@ -2709,14 +2707,12 @@ out_unblock:
goto out_resume;
}
/* scst_mutex supposed to be held and activities suspended */
int scst_cm_on_dev_register(struct scst_device *dev)
{
int res = 0;
TRACE_ENTRY();
scst_assert_activity_suspended();
lockdep_assert_held(&scst_mutex);
if (!scst_auto_cm_assignment || !dev->handler->auto_cm_assignment_possible)

6
scst/src/scst_lib.c
View File

@@ -4181,15 +4181,15 @@ static int scst_dif_none_type1(struct scst_cmd *cmd);
#define scst_dif_none_type1 scst_dif_none
#endif
/* Called under scst_mutex and suspended activity */
int scst_alloc_device(gfp_t gfp_mask, int nodeid,
struct scst_device **out_dev)
int scst_alloc_device(gfp_t gfp_mask, int nodeid, struct scst_device **out_dev)
{
struct scst_device *dev;
int res = 0;
TRACE_ENTRY();
lockdep_assert_held(&scst_mutex);
dev = kmem_cache_alloc_node(scst_dev_cachep, gfp_mask, nodeid);
if (dev == NULL) {
PRINT_ERROR("%s", "Allocation of scst_device failed");

5
scst/src/scst_main.c
View File

@@ -1347,10 +1347,6 @@ int scst_register_virtual_device_node(struct scst_dev_type *dev_handler,
if (res != 0)
goto out;
res = scst_suspend_activity(SCST_SUSPEND_TIMEOUT_USER);
if (res != 0)
goto out;
res = mutex_lock_interruptible(&scst_mutex);
if (res != 0)
goto out_resume;
@@ -1419,7 +1415,6 @@ int scst_register_virtual_device_node(struct scst_dev_type *dev_handler,
goto out_unreg;
mutex_unlock(&scst_mutex);
scst_resume_activity();
res = dev->virt_id;