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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2018-09-06 11:47:26 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-10-09 12:20:52 +0300
commitd36a9281399700f3b573f61b845367cfc3e12cb1 (patch)
tree412c592a2fe6c873818e5ff747523b1520cac5fa /arch/s390/appldata
parentf689789a288e297451869c0770b3351c80c85b15 (diff)
downloadlinux-d36a9281399700f3b573f61b845367cfc3e12cb1.tar.xz
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>
Diffstat (limited to 'arch/s390/appldata')
-rw-r--r--arch/s390/appldata/appldata_base.c35
1 files changed, 23 insertions, 12 deletions
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index 50dd7117cbc1..e4b58240ec53 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -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,
- (void *) buffer, length);
+ 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> ****************************/