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From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
To:     Mathieu Malaterre <malat@debian.org>
Cc:     Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Lennart Sorensen <lsorense@csclub.uwaterloo.ca>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] Fix loading of module radeonfb on PowerMac
Date:   Thu, 08 Feb 2018 14:28:11 +0100
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On Wednesday, January 31, 2018 08:51:23 PM Mathieu Malaterre wrote:
> Bartlomiej,
> 
> On Wed, Jan 31, 2018 at 12:57 PM, Bartlomiej Zolnierkiewicz
> <b.zolnierkie@samsung.com> wrote:
> > On Tuesday, January 30, 2018 02:14:10 PM Mathieu Malaterre wrote:
> >> Bartlomiej,
> >>
> >> On Wed, Jan 3, 2018 at 3:47 PM, Bartlomiej Zolnierkiewicz
> >> <b.zolnierkie@samsung.com> wrote:
> >> >
> >> > On Thursday, December 21, 2017 11:07:56 PM Mathieu Malaterre wrote:
> >> >> When the linux kernel is build with (typical kernel ship with Debian
> >> >> installer):
> >> >>
> >> >> CONFIG_FB_OF=y
> >> >> CONFIG_VT_HW_CONSOLE_BINDING=y
> >> >> CONFIG_FB_RADEON=m
> >> >>
> >> >> The offb driver takes precedence over module radeonfb. It is then
> >> >> impossible to load the module, error reported is:
> >> >>
> >> >> [   96.551486] radeonfb 0000:00:10.0: enabling device (0006 -> 0007)
> >> >> [   96.551526] radeonfb 0000:00:10.0: BAR 0: can't reserve [mem 0x98000000-0x9fffffff pref]
> >> >> [   96.551531] radeonfb (0000:00:10.0): cannot request region 0.
> >> >> [   96.551545] radeonfb: probe of 0000:00:10.0 failed with error -16
> >> >>
> >> >> This patch reproduce the behavior of the module radeon, so as to make it
> >> >> possible to load radeonfb when offb is first loaded.
> >> >>
> >> >> It should be noticed that `offb_destroy` is never called which explain the
> >> >> need to skip error detection on the radeon side.
> >> >
> >> > This still needs to be explained more, from my last mail:
> >> >
> >> > "The last put_fb_info() on fb_info should call ->fb_destroy
> >> > (offb_destroy in our case) and remove_conflicting_framebuffers()
> >> > is calling put_fb_info() so there is some extra reference on
> >> > fb_info somewhere preventing it from going away.
> >> >
> >> > Please look into fixing this."
> >>
> >> I am not familiar with the fb stuff internals but here is what I see:
> >>
> >> # modprobe radeonfb
> >>
> >> leads to:
> >>
> >> [   52.058546] bus: 'pci': add driver radeonfb
> >> [   52.058588] bus: 'pci': driver_probe_device: matched device
> >> 0000:00:10.0 with driver radeonfb
> >> [   52.058595] bus: 'pci': really_probe: probing driver radeonfb with
> >> device 0000:00:10.0
> >> [   52.058608] devices_kset: Moving 0000:00:10.0 to end of list
> >> [   52.058613] radeonfb_pci_register BEGIN
> >> [   52.058634] radeonfb 0000:00:10.0: enabling device (0006 -> 0007)
> >> <at this point radeon_kick_out_firmware_fb is called>
> >> [   52.058666] checking generic (9c008000 96000) vs hw (98000000 8000000)
> >> [   52.058667] fb: switching to radeonfb from OFfb ATY,RockHo
> >> [   52.058844] Console: switching to colour dummy device 80x25
> >> [   52.058860] device: 'fb0': device_unregister
> >> [   52.058956] PM: Removing info for No Bus:fb0
> >> [   52.059014] device: 'fb0': device_create_release
> >> <a call to do_unregister_framebuffer is done>
> >> <put_fb_info is done with a count=2 and dev=NULL>
> >> [   52.059048] device: 'vtcon1': device_unregister
> >> [   52.059076] PM: Removing info for No Bus:vtcon1
> >> [   52.059091] device: 'vtcon1': device_create_release
> >> [   52.059107] radeonfb 0000:00:10.0: BAR 0: can't reserve [mem
> >> 0x98000000-0x9fffffff pref]
> >> [   52.256151] aper_base: 98000000 MC_FB_LOC to: 9bff9800, MC_AGP_LOC
> >> to: ffffa000
> >> [   52.256157] radeonfb (0000:00:10.0): Found 32768k of DDR 64 bits
> >> wide videoram
> >>
> >> I can confirm that offb_destroy is never called (not sure exactly
> >> why), but in any case the call to radeon_kick_out_firmware_fb happen
> >> much earlier, at least before the put_fb_info.
> >
> > It is okay, put_fb_info() is called indirectly by radeon_kick_out_firmware_fb()
> >
> > radeon_kick_out_firmware_fb()
> >         remove_conflicting_framebuffers()
> >                 do_remove_conflicting_framebuffers()
> >                         do_unregister_framebuffer()
> >                                 put_fb_info()
> >
> > offb_destroy() is not called because there is an extra reference on old
> > fb_info (->count == 2):
> >
> > static void put_fb_info(struct fb_info *fb_info)
> > {
> >         if (!atomic_dec_and_test(&fb_info->count))
> >                 return;
> >         if (fb_info->fbops->fb_destroy)
> >                 fb_info->fbops->fb_destroy(fb_info);
> > }
> >
> > The question is why there is an extra reference, probably user-space
> > is still holding the fb_info reference obtained in fb_open() call and
> > fb_release() is never called. Besides not calling fbops->fb_destroy()
> > this also causes missing call of fbops->fb_release() (in fb_release())
> > which some fb drivers are implementing (but not offb.c).
> >
> >> Could you describe a bit more the chain of calls you were thinking of ?
> >
> > Please add WARN_ON(1) to get_fb_info() and put_fb_info() so we can check
> > from the stacktrace if it is actually fb_open() that holds the extra
> > old fb_info reference.
> >
> > drivers/video/fbdev/core/fbmem.c:
> >
> > static struct fb_info *get_fb_info(unsigned int idx)
> > {
> >         struct fb_info *fb_info;
> >
> >         if (idx >= FB_MAX)
> >                 return ERR_PTR(-ENODEV);
> >
> >         mutex_lock(&registration_lock);
> >         fb_info = registered_fb[idx];
> >         if (fb_info)
> >                 atomic_inc(&fb_info->count);
> >
> > if (fb_info)
> >         WARN_ON(1);
> >
> >         mutex_unlock(&registration_lock);
> >
> >         return fb_info;
> > }
> >
> > static void put_fb_info(struct fb_info *fb_info)
> > {
> > WARN_ON(1);
> >
> >         if (!atomic_dec_and_test(&fb_info->count))
> >                 return;
> >         if (fb_info->fbops->fb_destroy)
> >                 fb_info->fbops->fb_destroy(fb_info);
> > }
> 
> 
> Alright, here is what I see:
> 
> [   18.961639] PM: Adding info for No Bus:vcs7
> [   18.966448] device: 'vcsa7': device_add
> [   18.966496] PM: Adding info for No Bus:vcsa7
> [   19.001701] WARNING: CPU: 0 PID: 405 at
> drivers/video/fbdev/core/fbmem.c:68 get_fb_info.part.3+0x58/0x7c
> [   19.001715] Modules linked in: uinput snd_aoa_codec_toonie
> snd_aoa_fabric_layout snd_aoa snd_aoa_i2sbus snd_aoa_soundbus snd_pcm
> snd_timer snd soundcore rack_meter evdev i2c_dev sg usb_storage
> ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto
> hid_generic usbhid hid ohci_pci ehci_pci ohci_hcd ehci_hcd sungem
> firewire_ohci sungem_phy sr_mod firewire_core crc_itu_t cdrom sd_mod
> usbcore
> [   19.001773] CPU: 0 PID: 405 Comm: Xorg Not tainted 4.15.0+ #321
> [   19.001778] NIP:  c039ef20 LR: c039eefc CTR: c039ef44
> [   19.001781] REGS: decc7c80 TRAP: 0700   Not tainted  (4.15.0+)
> [   19.001784] MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 28222828  XER: 00000000
> [   19.001795]
>                GPR00: c039eefc decc7d30 c147ab00 00000000 dc3ed8c0
> df568a6c 00000001 c147ab00
>                GPR08: df568a6c 00000002 00000000 dc280c50 28222822
> 006f9ff4 006fff50 80000000
>                GPR16: 88000228 00000008 bfcb5b08 00000002 decc7e60
> 80000000 ffffffea 00000041
>                GPR24: 00000000 00000006 df568a6c dc3ed8c0 df5ef1e8
> df568a40 c08f7c18 dc198800
> [   19.001835] NIP [c039ef20] get_fb_info.part.3+0x58/0x7c
> [   19.001840] LR [c039eefc] get_fb_info.part.3+0x34/0x7c
> [   19.001842] Call Trace:
> [   19.001848] [decc7d30] [c039eefc] get_fb_info.part.3+0x34/0x7c (unreliable)
> [   19.001854] [decc7d40] [c039efa0] fb_open+0x5c/0x18c
> [   19.001866] [decc7d60] [c01e0e90] chrdev_open+0xb8/0x19c
> [   19.001872] [decc7d90] [c01d7994] do_dentry_open+0x24c/0x398
> [   19.001881] [decc7dc0] [c01ec378] path_openat+0x4c4/0x11b8
> [   19.001888] [decc7e50] [c01ee0d8] do_filp_open+0xbc/0x10c
> [   19.001893] [decc7f00] [c01d93b0] do_sys_open+0x158/0x228
> [   19.001901] [decc7f40] [c00181cc] ret_from_syscall+0x0/0x40
> [   19.001908] --- interrupt: c01 at 0xb751b940
>                    LR = 0xb751b8dc
> [   19.001912] Instruction dump:
> [   19.001917] 7fc3f378 57ff103a 482cc171 3d20c093 39291a84 7fe9f82e
> 2f9f0000 419e0018
> [   19.001927] 7d20f828 31290001 7d20f92d 40a2fff4 <0fe00000> 7fc3f378
> 482cca69 7fe3fb78
> [   19.001938] ---[ end trace e0bf4192eb1c4f60 ]---
> [   19.001985] WARNING: CPU: 0 PID: 405 at
> drivers/video/fbdev/core/fbmem.c:77 put_fb_info+0x18/0x68
> [   19.001988] Modules linked in: uinput snd_aoa_codec_toonie
> snd_aoa_fabric_layout snd_aoa snd_aoa_i2sbus snd_aoa_soundbus snd_pcm
> snd_timer snd soundcore rack_meter evdev i2c_dev sg usb_storage
> ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto
> hid_generic usbhid hid ohci_pci ehci_pci ohci_hcd ehci_hcd sungem
> firewire_ohci sungem_phy sr_mod firewire_core crc_itu_t cdrom sd_mod
> usbcore
> [   19.002028] CPU: 0 PID: 405 Comm: Xorg Tainted: G        W
> 4.15.0+ #321
> [   19.002031] NIP:  c039e6ec LR: c039eeb0 CTR: c039ee48
> [   19.002035] REGS: decc7e10 TRAP: 0700   Tainted: G        W         (4.15.0+)
> [   19.002037] MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 28000222  XER: 20000000
> [   19.002047]
>                GPR00: c039eeb0 decc7ec0 c147ab00 dc198800 dc3ed8c0
> dc3ed8c8 00000001 c147ab00
>                GPR08: 00000000 c08fa6f8 00000000 dc280c50 28000228
> 006f9ff4 006fff50 00000000
>                GPR16: 007001a8 00000008 bfcb5b08 007001a4 00000000
> 0070d0c4 00000002 00000000
>                GPR24: b6ad8b1c dc3ed8c8 df5ef1e8 df3e4ee0 dc280c50
> df5ef1e8 dc19880c dc198800
> [   19.002086] NIP [c039e6ec] put_fb_info+0x18/0x68
> [   19.002091] LR [c039eeb0] fb_release+0x68/0x80
> [   19.002093] Call Trace:
> [   19.002096] [decc7ec0] [df5ef1e8] 0xdf5ef1e8 (unreliable)
> [   19.002102] [decc7ed0] [c039eeb0] fb_release+0x68/0x80
> [   19.002108] [decc7ee0] [c01dd2e8] __fput+0xb4/0x260
> [   19.002118] [decc7f10] [c006e088] task_work_run+0xc0/0xe8
> [   19.002129] [decc7f30] [c000aa90] do_notify_resume+0xb4/0xb8
> [   19.002135] [decc7f40] [c0018b4c] do_user_signal+0x7c/0xcc
> [   19.002140] --- interrupt: c00 at 0xb751a7d8
>                    LR = 0xb751a7ac
> [   19.002144] Instruction dump:
> [   19.002147] 80010014 38210010 7c0803a6 4e800020 38600000 4e800020
> 7c0802a6 90010004
> [   19.002157] 60000000 9421fff0 7c0802a6 90010014 <0fe00000> 7d401828
> 314affff 7d40192d
> [   19.002168] ---[ end trace e0bf4192eb1c4f61 ]---
> [   19.002595] WARNING: CPU: 0 PID: 405 at
> drivers/video/fbdev/core/fbmem.c:68 get_fb_info.part.3+0x58/0x7c
> [   19.002601] Modules linked in: uinput snd_aoa_codec_toonie
> snd_aoa_fabric_layout snd_aoa snd_aoa_i2sbus snd_aoa_soundbus snd_pcm
> snd_timer snd soundcore rack_meter evdev i2c_dev sg usb_storage
> ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 fscrypto
> hid_generic usbhid hid ohci_pci ehci_pci ohci_hcd ehci_hcd sungem
> firewire_ohci sungem_phy sr_mod firewire_core crc_itu_t cdrom sd_mod
> usbcore
> [   19.002645] CPU: 0 PID: 405 Comm: Xorg Tainted: G        W
> 4.15.0+ #321
> [   19.002649] NIP:  c039ef20 LR: c039eefc CTR: c039ef44
> [   19.002652] REGS: decc7c80 TRAP: 0700   Tainted: G        W         (4.15.0+)
> [   19.002655] MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 28222248  XER: 00000000
> [   19.002664]
>                GPR00: c039eefc decc7d30 c147ab00 00000000 deca0340
> deca0348 00000001 00000000
>                GPR08: 00000000 00000002 00000000 dc280c50 28222842
> 006f9ff4 006fff50 80000000
>                GPR16: 88000448 00000001 00000000 00000002 decc7e60
> 80000000 ffffffea 00000041
>                GPR24: 00000000 00000006 c01e0dd8 deca0340 df5ef1e8
> df568a40 c08f7c18 dc198800
> [   19.002704] NIP [c039ef20] get_fb_info.part.3+0x58/0x7c
> [   19.002708] LR [c039eefc] get_fb_info.part.3+0x34/0x7c
> [   19.002711] Call Trace:
> [   19.002716] [decc7d30] [c039eefc] get_fb_info.part.3+0x34/0x7c (unreliable)
> [   19.002722] [decc7d40] [c039efa0] fb_open+0x5c/0x18c
> [   19.002730] [decc7d60] [c01e0e90] chrdev_open+0xb8/0x19c
> [   19.002735] [decc7d90] [c01d7994] do_dentry_open+0x24c/0x398
> [   19.002743] [decc7dc0] [c01ec378] path_openat+0x4c4/0x11b8
> [   19.002748] [decc7e50] [c01ee0d8] do_filp_open+0xbc/0x10c
> [   19.002754] [decc7f00] [c01d93b0] do_sys_open+0x158/0x228
> [   19.002760] [decc7f40] [c00181cc] ret_from_syscall+0x0/0x40
> [   19.002766] --- interrupt: c01 at 0xb751b940
>                    LR = 0xb751b8dc
> [   19.002770] Instruction dump:
> [   19.002774] 7fc3f378 57ff103a 482cc171 3d20c093 39291a84 7fe9f82e
> 2f9f0000 419e0018
> [   19.002784] 7d20f828 31290001 7d20f92d 40a2fff4 <0fe00000> 7fc3f378
> 482cca69 7fe3fb78
> [   19.002795] ---[ end trace e0bf4192eb1c4f62 ]---
> [   19.011629] gem 0002:20:0f.0 eth0: Link is up at 100 Mbps, full-duplex
> [   19.011746] gem 0002:20:0f.0 eth0: Pause is disabled
> [   19.011846] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> [   19.018954] device: 'input3': device_add
> [   19.019031] PM: Adding info for No Bus:input3
> 
> 
> Then later on (after modprobe radeonfb):
> 
> [  657.135105] PM: Removing info for No Bus:fb0
> [  657.135164] device: 'fb0': device_create_release
> [  657.135279] WARNING: CPU: 0 PID: 475 at
> drivers/video/fbdev/core/fbmem.c:77 put_fb_info+0x18/0x68
> [  657.135284] Modules linked in: radeonfb(+) uinput
> snd_aoa_codec_toonie snd_aoa_fabric_layout snd_aoa snd_aoa_i2sbus
> snd_aoa_soundbus snd_pcm snd_timer snd soundcore rack_meter evdev
> i2c_dev sg usb_storage ip_tables x_tables autofs4 ext4 crc16 mbcache
> jbd2 fscrypto hid_generic usbhid hid ohci_pci ehci_pci ohci_hcd
> ehci_hcd sungem firewire_ohci sungem_phy sr_mod firewire_core
> crc_itu_t cdrom sd_mod usbcore
> [  657.135344] CPU: 0 PID: 475 Comm: modprobe Tainted: G        W
>   4.15.0+ #321
> [  657.135348] NIP:  c039e6ec LR: c039e834 CTR: 00000000
> [  657.135352] REGS: dec93af0 TRAP: 0700   Tainted: G        W         (4.15.0+)
> [  657.135355] MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 24228822  XER: 20000000
> [  657.135365]
>                GPR00: c039e834 dec93ba0 dc28eaa0 dc198800 00000000
> 000005c0 00000002 00000000
>                GPR08: 00001032 c08c2c2c 00000000 c08c1ab0 28228424
> 0049ce6c e2287b5c 00000000
>                GPR16: c06974dc 00000007 e2284384 00000001 dec9852c
> e2282610 00000000 000a0000
>                GPR24: c07c9d60 c07c9d2c dc19880c 00000000 dec93bb8
> 00000000 c0931a84 dc198800
> [  657.135405] NIP [c039e6ec] put_fb_info+0x18/0x68
> [  657.135411] LR [c039e834] do_unregister_framebuffer+0xf8/0x148
> [  657.135413] Call Trace:
> [  657.135419] [dec93bb0] [c039e834] do_unregister_framebuffer+0xf8/0x148
> [  657.135425] [dec93be0] [c039ea1c]
> do_remove_conflicting_framebuffers+0x198/0x1b8
> [  657.135431] [dec93c30] [c039ea84] remove_conflicting_framebuffers+0x48/0x6c
> [  657.135474] [dec93c50] [e2274d6c]
> radeonfb_pci_register+0x184/0x1838 [radeonfb]
> [  657.135481] [dec93cb0] [c037e9fc] pci_device_probe+0x110/0x180
> [  657.135492] [dec93ce0] [c045be70] driver_probe_device+0x378/0x4a0
> [  657.135497] [dec93d10] [c045c0ac] __driver_attach+0x114/0x118
> [  657.135503] [dec93d30] [c04593dc] bus_for_each_dev+0x74/0xc0
> [  657.135508] [dec93d60] [c045acd4] bus_add_driver+0x18c/0x2a0
> [  657.135515] [dec93d80] [c045ce3c] driver_register+0x94/0x13c
> [  657.135524] [dec93d90] [c0004af4] do_one_initcall+0x4c/0x178
> [  657.135536] [dec93df0] [c00ced18] do_init_module+0x70/0x1ec
> [  657.135542] [dec93e10] [c00cdcb0] load_module+0x20d8/0x26b8
> [  657.135548] [dec93ec0] [c00ce500] SyS_finit_module+0xc4/0x120
> [  657.135555] [dec93f40] [c00181cc] ret_from_syscall+0x0/0x40
> [  657.135562] --- interrupt: c01 at 0x34d450
>                    LR = 0x476108
> [  657.135566] Instruction dump:
> [  657.135572] 80010014 38210010 7c0803a6 4e800020 38600000 4e800020
> 7c0802a6 90010004
> [  657.135582] 60000000 9421fff0 7c0802a6 90010014 <0fe00000> 7d401828
> 314affff 7d40192d
> [  657.135593] ---[ end trace e0bf4192eb1c4f63 ]---
> [  657.135613] device: 'vtcon1': device_unregister
> [  657.135644] PM: Removing info for No Bus:vtcon1
> 
> 
> Full dmesg:
> https://people.debian.org/~malat/dmesg_radeonfb.txt
> 
> Does that help at all? the call stack does not make much sense to me.
> I am accessing the Mac Mini over ssh.

Thank you, it helps.

User-space is holding reference on the /dev/fb0 and old fb_info
(from offb) while offb is being replaced by radeonfb (this is
why ->fb_destroy is never called). You may try checking with
lsof command to see what is holding /dev/fb0 open..

> For reference, the patch I used is:
> https://github.com/malaterre/linux/commit/89fd7d4438c5200a1a4fcba1d60dd701fda4f40e.patch
> 
> 
> >> >> Signed-off-by: Mathieu Malaterre <malat@debian.org>
> >> >> Link: https://bugs.debian.org/826629#57
> >> >> Link: https://bugzilla.kernel.org/show_bug.cgi?id=119741
> >> >> Suggested-by: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
> >> >> ---
> >> >> v2: Only fails when CONFIG_PCC is not set
> >> >> v3: Only fails when CONFIG_FB_OF is not set, CONFIG_PCC was too broad. Since the conflicts in region is due to OFfb explicitly refers to it.
> >> >
> >> > It seems that there may still be configurations when this is
> >> > incorrect -> when offb drives primary (non-radeon) card and radeonfb
> >> > drives secondary (radeon) card..
> >> >
> >> >>  drivers/video/fbdev/aty/radeon_base.c | 26 ++++++++++++++++++++++++++
> >> >>  1 file changed, 26 insertions(+)
> >> >>
> >> >> diff --git a/drivers/video/fbdev/aty/radeon_base.c b/drivers/video/fbdev/aty/radeon_base.c
> >> >> index 4d77daeecf99..221879196531 100644
> >> >> --- a/drivers/video/fbdev/aty/radeon_base.c
> >> >> +++ b/drivers/video/fbdev/aty/radeon_base.c
> >> >> @@ -2259,6 +2259,22 @@ static const struct bin_attribute edid2_attr = {
> >> >>       .read   = radeon_show_edid2,
> >> >>  };
> >> >>
> >> >> +static int radeon_kick_out_firmware_fb(struct pci_dev *pdev)
> >> >> +{
> >> >> +     struct apertures_struct *ap;
> >> >> +
> >> >> +     ap = alloc_apertures(1);
> >> >> +     if (!ap)
> >> >> +             return -ENOMEM;
> >> >> +
> >> >> +     ap->ranges[0].base = pci_resource_start(pdev, 0);
> >> >> +     ap->ranges[0].size = pci_resource_len(pdev, 0);
> >> >> +
> >> >> +     remove_conflicting_framebuffers(ap, KBUILD_MODNAME, false);
> >> >> +     kfree(ap);
> >> >> +
> >> >> +     return 0;
> >> >> +}
> >> >>
> >> >>  static int radeonfb_pci_register(struct pci_dev *pdev,
> >> >>                                const struct pci_device_id *ent)
> >> >> @@ -2312,19 +2328,27 @@ static int radeonfb_pci_register(struct pci_dev *pdev,
> >> >>       rinfo->fb_base_phys = pci_resource_start (pdev, 0);
> >> >>       rinfo->mmio_base_phys = pci_resource_start (pdev, 2);
> >> >>
> >> >> +     ret = radeon_kick_out_firmware_fb(pdev);
> >> >> +     if (ret)
> >> >> +             return ret;
> >> >> +
> >> >>       /* request the mem regions */
> >> >>       ret = pci_request_region(pdev, 0, "radeonfb framebuffer");
> >> >>       if (ret < 0) {
> >> >> +#ifndef CONFIG_FB_OF
> >> >>               printk( KERN_ERR "radeonfb (%s): cannot request region 0.\n",
> >> >>                       pci_name(rinfo->pdev));
> >> >>               goto err_release_fb;
> >> >> +#endif
> >> >>       }
> >> >>
> >> >>       ret = pci_request_region(pdev, 2, "radeonfb mmio");
> >> >>       if (ret < 0) {
> >> >> +#ifndef CONFIG_FB_OF
> >> >>               printk( KERN_ERR "radeonfb (%s): cannot request region 2.\n",
> >> >>                       pci_name(rinfo->pdev));
> >> >>               goto err_release_pci0;
> >> >> +#endif
> >> >>       }
> >> >>
> >> >>       /* map the regions */
> >> >> @@ -2509,10 +2533,12 @@ static int radeonfb_pci_register(struct pci_dev *pdev,
> >> >>       iounmap(rinfo->mmio_base);
> >> >>  err_release_pci2:
> >> >>       pci_release_region(pdev, 2);
> >> >> +#ifndef CONFIG_FB_OF
> >> >>  err_release_pci0:
> >> >>       pci_release_region(pdev, 0);
> >> >>  err_release_fb:
> >> >>          framebuffer_release(info);
> >> >> +#endif
> >> >>  err_disable:
> >> >>  err_out:
> >> >>       return ret;
> >> >

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics