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drm/nouveau/mxm: fix null deref on load

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Since commit 61b365a505 ("drm/nouveau: populate master subdev pointer
only when fully constructed"), the nouveau_mxm(bios) call will return
NULL, since it's still being called from the constructor.  Instead, pass
the mxm pointer via the unused data field.

See https://bugs.freedesktop.org/show_bug.cgi?id=73791

Reported-by: Andreas Reis <andreas.reis@gmail.com>
Tested-by: Andreas Reis <andreas.reis@gmail.com>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ilia Mirkin 2014-01-19 10:30:32 -05:00 committed by Linus Torvalds
parent 4d93540299
commit 72de182362
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/nouveau/core/subdev/mxm/nv50.c
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@ -100,7 +100,7 @@ mxm_match_dcb(struct nouveau_mxm *mxm, u8 *data, void *info)
static int
mxm_dcb_sanitise_entry(struct nouveau_bios *bios, void *data, int idx, u16 pdcb)
{
struct nouveau_mxm *mxm = nouveau_mxm(bios);
struct nouveau_mxm *mxm = data;
struct context ctx = { .outp = (u32 *)(bios->data + pdcb) };
u8 type, i2cidx, link, ver, len;
u8 *conn;
@ -199,7 +199,7 @@ mxm_dcb_sanitise(struct nouveau_mxm *mxm)
return;
}
dcb_outp_foreach(bios, NULL, mxm_dcb_sanitise_entry);
dcb_outp_foreach(bios, mxm, mxm_dcb_sanitise_entry);
mxms_foreach(mxm, 0x01, mxm_show_unmatched, NULL);
}