From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matt Fleming Subject: Re: [patch 3/7 v2] Cleanup efi_enter_virtual_mode function Date: Wed, 13 Nov 2013 15:50:17 +0000 Message-ID: <20131113155017.GB17248@console-pimps.org> References: <20131105082007.872550445@dhcp-16-126.nay.redhat.com> <20131105082716.825753041@dhcp-16-126.nay.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20131105082716.825753041-je1gSBvt1TcFLmT5oZ11vB/sF2h8X+2i0E9HWUfgJXw@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+glkk-kexec=m.gmane.org-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org To: dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org Cc: mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org, horms-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org, bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org, ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org, hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org, vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org List-Id: linux-efi@vger.kernel.org On Tue, 05 Nov, at 04:20:10PM, dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org wrote: > Add two small functions: > efi_merge_regions and efi_map_regions, efi_enter_virtual_mode > calls them instead of embedding two long for loop. > > v1->v2: > refresh; coding style fixes. > > Signed-off-by: Dave Young > --- > arch/x86/platform/efi/efi.c | 107 +++++++++++++++++++++++++------------------- > 1 file changed, 63 insertions(+), 44 deletions(-) [...] > @@ -860,17 +840,59 @@ void __init efi_enter_virtual_mode(void) > efi.systab = (efi_system_table_t *) (unsigned long) systab; > } > > - new_memmap = krealloc(new_memmap, > - (count + 1) * memmap.desc_size, > - GFP_KERNEL); > - if (!new_memmap) > + *new_memmap = krealloc(*new_memmap, > + (*count + 1) * memmap.desc_size, > + GFP_KERNEL); > + if (!*new_memmap) > goto err_out; > > - memcpy(new_memmap + (count * memmap.desc_size), md, > + memcpy(*new_memmap + (*count * memmap.desc_size), md, > memmap.desc_size); > - count++; > + (*count)++; > } > > +err_out: > + pr_err("Error reallocating memory, EFI runtime non-functional!\n"); > +} You should really return an error value here so that we don't dereference 'new_memmap' below if it's NULL. In fact, just return the memmap... > + > + efi_merge_regions(); > + > + efi_map_regions(&new_memmap, &count); > + and make sure to check the return value here. -- Matt Fleming, Intel Open Source Technology Center