diff options
| author | David Miller <davem@davemloft.net> | 2009-02-18 01:35:23 -0800 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2009-03-13 14:24:04 +1000 |
| commit | 958a6f8ccb1964adc3eec84cf401c5baeb4fbca0 (patch) | |
| tree | 88dc0089ae4517ac1bb55a39ed15eab10bec5112 | |
| parent | f1a2a9b6189f9f5c27672d4d32fec9492c6486b2 (diff) | |
drm: radeon: Fix unaligned access in r300_scratch().
In compat mode, the cmdbuf->buf 64-bit address cookie can
potentially be only 32-bit aligned. Dereferencing this as
64-bit causes expensive unaligned traps on platforms like
sparc64.
Use get_unaligned() to fix.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
| -rw-r--r-- | drivers/gpu/drm/radeon/r300_cmdbuf.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/radeon/r300_cmdbuf.c b/drivers/gpu/drm/radeon/r300_cmdbuf.c index cace3964fee..3efa633966e 100644 --- a/drivers/gpu/drm/radeon/r300_cmdbuf.c +++ b/drivers/gpu/drm/radeon/r300_cmdbuf.c @@ -37,6 +37,8 @@ #include "radeon_drv.h" #include "r300_reg.h" +#include <asm/unaligned.h> + #define R300_SIMULTANEOUS_CLIPRECTS 4 /* Values for R300_RE_CLIPRECT_CNTL depending on the number of cliprects @@ -917,6 +919,7 @@ static int r300_scratch(drm_radeon_private_t *dev_priv, { u32 *ref_age_base; u32 i, buf_idx, h_pending; + u64 ptr_addr; RING_LOCALS; if (cmdbuf->bufsz < @@ -930,7 +933,8 @@ static int r300_scratch(drm_radeon_private_t *dev_priv, dev_priv->scratch_ages[header.scratch.reg]++; - ref_age_base = (u32 *)(unsigned long)*((uint64_t *)cmdbuf->buf); + ptr_addr = get_unaligned((u64 *)cmdbuf->buf); + ref_age_base = (u32 *)(unsigned long)ptr_addr; cmdbuf->buf += sizeof(u64); cmdbuf->bufsz -= sizeof(u64); |