From: Alex Deucher Date: Mon, 27 Sep 2010 14:57:10 +0000 (-0400) Subject: drm/radeon/kms: fix potential segfault in r600_ioctl_wait_idle X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e488459a0e131acc9e14df093cfee740bc431953;p=openwrt%2Fstaging%2Fblogic.git drm/radeon/kms: fix potential segfault in r600_ioctl_wait_idle radeon_gem_wait_idle_ioctl can apparently get called prior to the vram page being set up or even if accel if false, so make sure it's valid before using it. Should fix: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=597636 https://bugs.freedesktop.org/show_bug.cgi?id=29834 Signed-off-by: Alex Deucher Cc: stable@kernel.org Signed-off-by: Dave Airlie --- diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index ddc3adea1dda..7a04959ba0ee 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -3528,7 +3528,8 @@ void r600_ioctl_wait_idle(struct radeon_device *rdev, struct radeon_bo *bo) /* r7xx hw bug. write to HDP_DEBUG1 followed by fb read * rather than write to HDP_REG_COHERENCY_FLUSH_CNTL */ - if ((rdev->family >= CHIP_RV770) && (rdev->family <= CHIP_RV740)) { + if ((rdev->family >= CHIP_RV770) && (rdev->family <= CHIP_RV740) && + rdev->vram_scratch.ptr) { void __iomem *ptr = (void *)rdev->vram_scratch.ptr; u32 tmp;