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kmem_zalloc with KM_SLEEP will never return NULL

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These allocations can never fail.  Leaving the error handling
code here gives the impression they can so it has been removed.

Signed-off-by: luozhengzheng <luo.zhengzheng@zte.com.cn>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #5048
This commit is contained in:
luozhengzheng 2016-08-31 09:32:02 +08:00 committed by Brian Behlendorf
parent 2d96d7aa56
commit ca8587a517
2 changed files with 1 additions and 44 deletions
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2
module/zfs/fm.c
View File

@ -426,8 +426,6 @@ zfs_zevent_alloc(void)
zevent_t *ev;
ev = kmem_zalloc(sizeof (zevent_t), KM_SLEEP);
if (ev == NULL)
return (NULL);
list_create(&ev->ev_ze_list, sizeof (zfs_zevent_t),
offsetof(zfs_zevent_t, ze_node));

43
module/zpios/pios.c
View File

@ -287,11 +287,6 @@ zpios_setup_run(run_args_t **run_args, zpios_cmd_t *kcmd, struct file *file)
size = sizeof (*ra) + kcmd->cmd_region_count * sizeof (zpios_region_t);
ra = vmem_zalloc(size, KM_SLEEP);
if (ra == NULL) {
zpios_print(file, "Unable to vmem_zalloc() %d bytes "
"for regions\n", size);
return (-ENOMEM);
}
*run_args = ra;
strncpy(ra->pool, kcmd->cmd_pool, ZPIOS_NAME_SIZE - 1);
@ -734,16 +729,8 @@ zpios_threads_run(run_args_t *run_args)
int i, rc = 0, tc = run_args->thread_count;
tsks = kmem_zalloc(sizeof (struct task_struct *) * tc, KM_SLEEP);
if (tsks == NULL) {
rc = -ENOMEM;
goto cleanup2;
}
run_args->threads = kmem_zalloc(sizeof (thread_data_t *)*tc, KM_SLEEP);
if (run_args->threads == NULL) {
rc = -ENOMEM;
goto cleanup;
}
init_waitqueue_head(&run_args->waitq);
run_args->threads_done = 0;
@ -751,10 +738,6 @@ zpios_threads_run(run_args_t *run_args)
/* Create all the needed threads which will sleep until awoken */
for (i = 0; i < tc; i++) {
thr = kmem_zalloc(sizeof (thread_data_t), KM_SLEEP);
if (thr == NULL) {
rc = -ENOMEM;
goto taskerr;
}
thr->thread_no = i;
thr->run_args = run_args;
@ -846,8 +829,6 @@ out:
cleanup:
kmem_free(tsks, sizeof (struct task_struct *) * tc);
cleanup2:
/* Returns first encountered thread error (if any) */
return (rc);
taskerr:
@ -943,17 +924,11 @@ zpios_open(struct inode *inode, struct file *file)
zpios_info_t *info;
info = (zpios_info_t *)kmem_alloc(sizeof (*info), KM_SLEEP);
if (info == NULL)
return (-ENOMEM);
spin_lock_init(&info->info_lock);
info->info_size = ZPIOS_INFO_BUFFER_SIZE;
info->info_buffer =
(char *) vmem_alloc(ZPIOS_INFO_BUFFER_SIZE, KM_SLEEP);
if (info->info_buffer == NULL) {
kmem_free(info, sizeof (*info));
return (-ENOMEM);
}
info->info_head = info->info_buffer;
file->private_data = (void *)info;
@ -1006,10 +981,6 @@ zpios_buffer_size(struct file *file, zpios_cfg_t *kcfg, unsigned long arg)
size = kcfg->cfg_arg1;
buf = (char *)vmem_alloc(size, KM_SLEEP);
if (buf == NULL) {
rc = -ENOMEM;
goto out;
}
/* Zero fill and truncate contents when coping buffer */
min = ((size < info->info_size) ? size : info->info_size);
@ -1026,7 +997,7 @@ zpios_buffer_size(struct file *file, zpios_cfg_t *kcfg, unsigned long arg)
if (copy_to_user((struct zpios_cfg_t __user *)arg,
kcfg, sizeof (*kcfg)))
rc = -EFAULT;
out:
spin_unlock(&info->info_lock);
return (rc);
@ -1080,11 +1051,6 @@ zpios_ioctl_cmd(struct file *file, unsigned long arg)
int rc = -EINVAL;
kcmd = kmem_alloc(sizeof (zpios_cmd_t), KM_SLEEP);
if (kcmd == NULL) {
zpios_print(file, "Unable to kmem_alloc() %ld byte for "
"zpios_cmd_t\n", (long int)sizeof (zpios_cmd_t));
return (-ENOMEM);
}
rc = copy_from_user(kcmd, (zpios_cfg_t *)arg, sizeof (zpios_cmd_t));
if (rc) {
@ -1103,13 +1069,6 @@ zpios_ioctl_cmd(struct file *file, unsigned long arg)
/* Allocate memory for any opaque data the caller needed to pass on */
if (kcmd->cmd_data_size > 0) {
data = (void *)vmem_alloc(kcmd->cmd_data_size, KM_SLEEP);
if (data == NULL) {
zpios_print(file, "Unable to vmem_alloc() %ld "
"bytes for data buffer\n",
(long)kcmd->cmd_data_size);
rc = -ENOMEM;
goto out_cmd;
}
rc = copy_from_user(data, (void *)(arg + offsetof(zpios_cmd_t,
cmd_data_str)), kcmd->cmd_data_size);