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s390/appldata: do not use stack buffers for hardware data 

With CONFIG_VMAP_STACK=y the stack is allocated from the vmalloc space.
Data structures passed to a hardware or a hypervisor interface that
requires V=R can not be allocated on the stack anymore.

Use kmalloc to get memory for the appldata_product_id and the
appldata_parameter_list structures.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2018-09-06 10:47:26 +02:00
parent f689789a28
commit d36a928139
1 changed files with 23 additions and 12 deletions
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33
arch/s390/appldata/appldata_base.c
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@ -137,6 +137,14 @@ static void appldata_work_fn(struct work_struct *work)
mutex_unlock(&appldata_ops_mutex);
}
static struct appldata_product_id appldata_id = {
.prod_nr = {0xD3, 0xC9, 0xD5, 0xE4,
0xE7, 0xD2, 0xD9}, /* "LINUXKR" */
.prod_fn = 0xD5D3, /* "NL" */
.version_nr = 0xF2F6, /* "26" */
.release_nr = 0xF0F1, /* "01" */
};
/*
* appldata_diag()
*
@ -145,19 +153,22 @@ static void appldata_work_fn(struct work_struct *work)
int appldata_diag(char record_nr, u16 function, unsigned long buffer,
u16 length, char *mod_lvl)
{
struct appldata_parameter_list parm_list;
struct appldata_product_id id = {
.prod_nr = {0xD3, 0xC9, 0xD5, 0xE4,
0xE7, 0xD2, 0xD9}, /* "LINUXKR" */
.prod_fn = 0xD5D3, /* "NL" */
.version_nr = 0xF2F6, /* "26" */
.release_nr = 0xF0F1, /* "01" */
};
struct appldata_parameter_list *parm_list;
struct appldata_product_id *id;
int rc;
id.record_nr = record_nr;
id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
return appldata_asm(&parm_list, &id, function,
parm_list = kmalloc(sizeof(*parm_list), GFP_KERNEL);
id = kmemdup(&appldata_id, sizeof(appldata_id), GFP_KERNEL);
rc = -ENOMEM;
if (parm_list && id) {
id->record_nr = record_nr;
id->mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
rc = appldata_asm(parm_list, id, function,
(void *) buffer, length);
}
kfree(id);
kfree(parm_list);
return rc;
}
/************************ timer, work, DIAG <END> ****************************/