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| author | Nicolai Stange <nicstange@gmail.com> | 2016-03-22 22:05:27 +0100 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2016-05-02 21:25:40 +0200 |
| commit | b2c0cbd657173f024138d6421774007690ceeffd (patch) | |
| tree | 6890bbf35fee17fbafd77789e91689a5116b8927 /drivers/gpu/drm/radeon/r600.c | |
| parent | drm/amdgpu: refine code for code style. (diff) | |
| download | linux-b2c0cbd657173f024138d6421774007690ceeffd.tar.xz linux-b2c0cbd657173f024138d6421774007690ceeffd.zip | |
drm/radeon: don't include RADEON_HPD_NONE in HPD IRQ enable bitsets
The values of all but the RADEON_HPD_NONE members of the radeon_hpd_id
enum transform 1:1 into bit positions within the 'enabled' bitset as
assembled by evergreen_hpd_init():
enabled |= 1 << radeon_connector->hpd.hpd;
However, if ->hpd.hpd happens to equal RADEON_HPD_NONE == 0xff, UBSAN
reports
UBSAN: Undefined behaviour in drivers/gpu/drm/radeon/evergreen.c:1867:16
shift exponent 255 is too large for 32-bit type 'int'
[...]
Call Trace:
[<ffffffff818c4d35>] dump_stack+0xbc/0x117
[<ffffffff818c4c79>] ? _atomic_dec_and_lock+0x169/0x169
[<ffffffff819411bb>] ubsan_epilogue+0xd/0x4e
[<ffffffff81941cbc>] __ubsan_handle_shift_out_of_bounds+0x1fb/0x254
[<ffffffffa0ba7f2e>] ? atom_execute_table+0x3e/0x50 [radeon]
[<ffffffff81941ac1>] ? __ubsan_handle_load_invalid_value+0x158/0x158
[<ffffffffa0b87700>] ? radeon_get_pll_use_mask+0x130/0x130 [radeon]
[<ffffffff81219930>] ? wake_up_klogd_work_func+0x60/0x60
[<ffffffff8121a35e>] ? vprintk_default+0x3e/0x60
[<ffffffffa0c603c4>] evergreen_hpd_init+0x274/0x2d0 [radeon]
[<ffffffffa0c603c4>] ? evergreen_hpd_init+0x274/0x2d0 [radeon]
[<ffffffffa0bd196e>] radeon_modeset_init+0x8ce/0x18d0 [radeon]
[<ffffffffa0b71d86>] radeon_driver_load_kms+0x186/0x350 [radeon]
[<ffffffffa03b6b16>] drm_dev_register+0xc6/0x100 [drm]
[<ffffffffa03bc8c4>] drm_get_pci_dev+0xe4/0x490 [drm]
[<ffffffff814b83f0>] ? kfree+0x220/0x370
[<ffffffffa0b687c2>] radeon_pci_probe+0x112/0x140 [radeon]
[...]
=====================================================================
radeon 0000:01:00.0: No connectors reported connected with modes
At least on x86, there should be no user-visible impact as there
1 << 0xff == 1 << (0xff & 31) == 1 << 31
holds and 31 > RADEON_MAX_HPD_PINS. Thus, this patch is a cosmetic one.
All of the above applies analogously to evergreen_hpd_fini(),
r100_hpd_init(), r100_hpd_fini(), r600_hpd_init(), r600_hpd_fini(),
rs600_hpd_init() and rs600_hpd_fini()
Silence UBSAN by checking ->hpd.hpd for RADEON_HPD_NONE before oring it
into the 'enabled' bitset in the *_init()- or the 'disabled' bitset in
the *_fini()-functions respectively.
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/r600.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/r600.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index d7896bb553a9..9247e7d207fe 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -1002,7 +1002,8 @@ void r600_hpd_init(struct radeon_device *rdev) break; } } - enable |= 1 << radeon_connector->hpd.hpd; + if (radeon_connector->hpd.hpd != RADEON_HPD_NONE) + enable |= 1 << radeon_connector->hpd.hpd; radeon_hpd_set_polarity(rdev, radeon_connector->hpd.hpd); } radeon_irq_kms_enable_hpd(rdev, enable); @@ -1055,7 +1056,8 @@ void r600_hpd_fini(struct radeon_device *rdev) break; } } - disable |= 1 << radeon_connector->hpd.hpd; + if (radeon_connector->hpd.hpd != RADEON_HPD_NONE) + disable |= 1 << radeon_connector->hpd.hpd; } radeon_irq_kms_disable_hpd(rdev, disable); } |