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pstore: gracefully handle NULL pstore_info functions

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If a pstore backend doesn't want to support various portions of the
pstore interface, it can just leave those functions NULL instead of
creating no-op stubs.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Kees Cook 2011-11-18 13:49:00 -08:00 committed by Tony Luck
parent 3d6d8d20ec
commit 2174f6df78
2 changed files with 5 additions and 4 deletions
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3
fs/pstore/inode.c
View File

@ -80,7 +80,8 @@ static int pstore_unlink(struct inode *dir, struct dentry *dentry)
{
struct pstore_private *p = dentry->d_inode->i_private;
p->psi->erase(p->type, p->id, p->psi);
if (p->psi->erase)
p->psi->erase(p->type, p->id, p->psi);
return simple_unlink(dir, dentry);
}

6
fs/pstore/platform.c
View File

@ -207,8 +207,7 @@ void pstore_get_records(int quiet)
return;
mutex_lock(&psi->read_mutex);
rc = psi->open(psi);
if (rc)
if (psi->open && psi->open(psi))
goto out;
while ((size = psi->read(&id, &type, &time, &buf, psi)) > 0) {
@ -219,7 +218,8 @@ void pstore_get_records(int quiet)
if (rc && (rc != -EEXIST || !quiet))
failed++;
}
psi->close(psi);
if (psi->close)
psi->close(psi);
out:
mutex_unlock(&psi->read_mutex);