pstore/ram: Run without kernel crash dump region

[sfrench/cifs-2.6.git] / fs / pstore / ram.c

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index c5c685589e36605297ec7aea898436a472ad1907..4310d547c3b2caedcefdf396054df3496150eb13 100644 (file)
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -800,26 +800,36 @@ static int ramoops_probe(struct platform_device *pdev)
 
        cxt->pstore.data = cxt;
        /*
-        * Since bufsize is only used for dmesg crash dumps, it
-        * must match the size of the dprz record (after PRZ header
-        * and ECC bytes have been accounted for).
+        * Prepare frontend flags based on which areas are initialized.
+        * For ramoops_init_przs() cases, the "max count" variable tells
+        * if there are regions present. For ramoops_init_prz() cases,
+        * the single region size is how to check.
         */
-       cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size;
-       cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL);
-       if (!cxt->pstore.buf) {
-               pr_err("cannot allocate pstore crash dump buffer\n");
-               err = -ENOMEM;
-               goto fail_clear;
-       }
-
-       cxt->pstore.flags = PSTORE_FLAGS_DMESG;
+       cxt->pstore.flags = 0;
+       if (cxt->max_dump_cnt)
+               cxt->pstore.flags |= PSTORE_FLAGS_DMESG;
        if (cxt->console_size)
                cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
-       if (cxt->ftrace_size)
+       if (cxt->max_ftrace_cnt)
                cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
        if (cxt->pmsg_size)
                cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
 
+       /*
+        * Since bufsize is only used for dmesg crash dumps, it
+        * must match the size of the dprz record (after PRZ header
+        * and ECC bytes have been accounted for).
+        */
+       if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) {
+               cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size;
+               cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL);
+               if (!cxt->pstore.buf) {
+                       pr_err("cannot allocate pstore crash dump buffer\n");
+                       err = -ENOMEM;
+                       goto fail_clear;
+               }
+       }
+
        err = pstore_register(&cxt->pstore);
        if (err) {
                pr_err("registering with pstore failed\n");