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authorMatthew Garrett <mjg59@srcf.ucam.org>2009-04-13 17:39:44 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-13 18:04:29 -0400
commit133bb070e94ab41d750c6f2160c8843e46f11b78 (patch)
tree843aaa121f13ed754c8f14bd7011591035ac1550 /drivers/video/efifb.c
parent0ca1071f7dbd673de826eb3fb01bfdfd1d423433 (diff)
efifb: exit if framebuffer address is invalid
efifb will attempt to ioremap a framebuffer even if its starting address is 0, failing and causing an ugly backtrace in the process. Exit before probing if this is the case. Signed-off-by: Matthew Garrett <mjg@redhat.com> Acked-by: Peter Jones <pjones@redhat.com> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/efifb.c')
-rw-r--r--drivers/video/efifb.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
index 0c5b9a9fd56f..8dea2bc92705 100644
--- a/drivers/video/efifb.c
+++ b/drivers/video/efifb.c
@@ -210,12 +210,15 @@ static int __init efifb_probe(struct platform_device *dev)
210 unsigned int size_total; 210 unsigned int size_total;
211 int request_succeeded = 0; 211 int request_succeeded = 0;
212 212
213 printk(KERN_INFO "efifb: probing for efifb\n");
214
215 if (!screen_info.lfb_depth) 213 if (!screen_info.lfb_depth)
216 screen_info.lfb_depth = 32; 214 screen_info.lfb_depth = 32;
217 if (!screen_info.pages) 215 if (!screen_info.pages)
218 screen_info.pages = 1; 216 screen_info.pages = 1;
217 if (!screen_info.lfb_base) {
218 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
219 return -ENODEV;
220 }
221 printk(KERN_INFO "efifb: probing for efifb\n");
219 222
220 /* just assume they're all unset if any are */ 223 /* just assume they're all unset if any are */
221 if (!screen_info.blue_size) { 224 if (!screen_info.blue_size) {