[PATCH] cachefiles: Drop superfluous readpages aops NULL check

[Matthew Wilcox]

On Mon, Oct 19, 2020 at 03:56:54PM +0100, David Howells wrote:
> From: Takashi Iwai <tiwai at suse.de>
> 
> After the recent actions to convert readpages aops to readahead, the
> NULL checks of readpages aops in cachefiles_read_or_alloc_page() may
> hit falsely.  More badly, it's an ASSERT() call, and this panics.
> 
> Drop the superfluous NULL checks for fixing this regression.
> 
> [DH: Note that cachefiles never actually used readpages, so this check was
>  never actually necessary]
> 
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=208883
> BugLink: https://bugzilla.opensuse.org/show_bug.cgi?id=1175245
> Fixes: 9ae326a69004 ("CacheFiles: A cache that backs onto a mounted filesystem")
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> Signed-off-by: David Howells <dhowells at redhat.com>
> cc: Matthew Wilcox (Oracle) <willy at infradead.org>

Acked-by: Matthew Wilcox (Oracle) <willy at infradead.org>