Merge commit 'v3.1-rc9' into fbdev-next

[firefly-linux-kernel-4.4.55.git] / fs / pstore / platform.c

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 221c04e5e333b6cc22c28680050bbba8d1aed895..c5300ec316965ac456091ae91ec18f1704b97681 100644 (file)
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -37,6 +37,8 @@
 static DEFINE_SPINLOCK(pstore_lock);
 static struct pstore_info *psinfo;
 
+static char *backend;
+
 /* How much of the console log to snapshot */
 static unsigned long kmsg_bytes = 10240;
 
@@ -67,7 +69,8 @@ static void pstore_dump(struct kmsg_dumper *dumper,
        unsigned long   size, total = 0;
        char            *dst, *why;
        u64             id;
-       int             hsize, part = 1;
+       int             hsize;
+       unsigned int    part = 1;
 
        if (reason < ARRAY_SIZE(reason_str))
                why = reason_str[reason];
@@ -78,7 +81,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
        oopscount++;
        while (total < kmsg_bytes) {
                dst = psinfo->buf;
-               hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part++);
+               hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part);
                size = psinfo->bufsize - hsize;
                dst += hsize;
 
@@ -94,8 +97,8 @@ static void pstore_dump(struct kmsg_dumper *dumper,
                memcpy(dst, s1 + s1_start, l1_cpy);
                memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
 
-               id = psinfo->write(PSTORE_TYPE_DMESG, hsize + l1_cpy + l2_cpy,
-                                  psinfo);
+               id = psinfo->write(PSTORE_TYPE_DMESG, part,
+                                  hsize + l1_cpy + l2_cpy, psinfo);
                if (reason == KMSG_DUMP_OOPS && pstore_is_mounted())
                        pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id,
                                      psinfo->buf, hsize + l1_cpy + l2_cpy,
@@ -103,6 +106,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
                l1 -= l1_cpy;
                l2 -= l2_cpy;
                total += l1_cpy + l2_cpy;
+               part++;
        }
        mutex_unlock(&psinfo->buf_mutex);
 }
@@ -129,6 +133,12 @@ int pstore_register(struct pstore_info *psi)
                spin_unlock(&pstore_lock);
                return -EBUSY;
        }
+
+       if (backend && strcmp(backend, psi->name)) {
+               spin_unlock(&pstore_lock);
+               return -EINVAL;
+       }
+
        psinfo = psi;
        spin_unlock(&pstore_lock);
 
@@ -197,7 +207,7 @@ int pstore_write(enum pstore_type_id type, char *buf, size_t size)
 
        mutex_lock(&psinfo->buf_mutex);
        memcpy(psinfo->buf, buf, size);
-       id = psinfo->write(type, size, psinfo);
+       id = psinfo->write(type, 0, size, psinfo);
        if (pstore_is_mounted())
                pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id, psinfo->buf,
                              size, CURRENT_TIME, psinfo);
@@ -206,3 +216,6 @@ int pstore_write(enum pstore_type_id type, char *buf, size_t size)
        return 0;
 }
 EXPORT_SYMBOL_GPL(pstore_write);
+
+module_param(backend, charp, 0444);
+MODULE_PARM_DESC(backend, "Pstore backend to use");