label = kasprintf(GFP_KERNEL, "ramoops:%s", name);
*prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
- cxt->memtype, 0, label);
+ cxt->memtype, PRZ_FLAG_ZAP_OLD, label);
if (IS_ERR(*prz)) {
int err = PTR_ERR(*prz);
return err;
}
- persistent_ram_zap(*prz);
-
*paddr += sz;
return 0;
struct persistent_ram_ecc_info *ecc_info)
{
int ret;
+ bool zap = !!(prz->flags & PRZ_FLAG_ZAP_OLD);
ret = persistent_ram_init_ecc(prz, ecc_info);
if (ret)
if (prz->buffer->sig == sig) {
if (buffer_size(prz) > prz->buffer_size ||
- buffer_start(prz) > buffer_size(prz))
+ buffer_start(prz) > buffer_size(prz)) {
pr_info("found existing invalid buffer, size %zu, start %zu\n",
buffer_size(prz), buffer_start(prz));
- else {
+ zap = true;
+ } else {
pr_debug("found existing buffer, size %zu, start %zu\n",
buffer_size(prz), buffer_start(prz));
persistent_ram_save_old(prz);
- return 0;
}
} else {
pr_debug("no valid data in buffer (sig = 0x%08x)\n",
prz->buffer->sig);
+ prz->buffer->sig = sig;
+ zap = true;
}
- /* Rewind missing or invalid memory area. */
- prz->buffer->sig = sig;
- persistent_ram_zap(prz);
+ /* Reset missing, invalid, or single-use memory area. */
+ if (zap)
+ persistent_ram_zap(prz);
return 0;
}
* PRZ_FLAG_NO_LOCK is used. For all other cases, locking is required.
*/
#define PRZ_FLAG_NO_LOCK BIT(0)
+#define PRZ_FLAG_ZAP_OLD BIT(1)
struct persistent_ram_buffer;
struct rs_control;