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drm/radeon: Make r100_cp_ring_info() and radeon_ring_gfx() safe (v2) 

commit 0eb3448aa6b31fbf24c31756aba7940cac5ad6b8 upstream.

Prevent NULL pointer dereference in case when radeon_ring_fini() did it's job.

Reading of r100_cp_ring_info and radeon_ring_gfx debugfs entries will lead to a KP if ring buffer was deallocated, e.g. on failed ring test.
Seen on PA-RISC machine having "radeon: ring test failed (scratch(0x8504)=0xCAFEDEAD)" issue.

v2: agd5f: add some parens around ring->ready check

Signed-off-by: Alex Ivanov <gnidorah@p0n4ik.tk>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Ivanov 2013-09-20 17:36:06 +04:00 committed by Greg Kroah-Hartman
parent 6452230ccf
commit f329055796
2 changed files with 10 additions and 6 deletions
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8
drivers/gpu/drm/radeon/r100.c
View File

@ -2935,9 +2935,11 @@ static int r100_debugfs_cp_ring_info(struct seq_file *m, void *data)
seq_printf(m, "CP_RB_RPTR 0x%08x\n", rdp);
seq_printf(m, "%u free dwords in ring\n", ring->ring_free_dw);
seq_printf(m, "%u dwords in ring\n", count);
for (j = 0; j <= count; j++) {
i = (rdp + j) & ring->ptr_mask;
seq_printf(m, "r[%04d]=0x%08x\n", i, ring->ring[i]);
if (ring->ready) {
for (j = 0; j <= count; j++) {
i = (rdp + j) & ring->ptr_mask;
seq_printf(m, "r[%04d]=0x%08x\n", i, ring->ring[i]);
}
}
return 0;
}

8
drivers/gpu/drm/radeon/radeon_ring.c
View File

@ -823,9 +823,11 @@ static int radeon_debugfs_ring_info(struct seq_file *m, void *data)
* packet that is the root issue
*/
i = (ring->rptr + ring->ptr_mask + 1 - 32) & ring->ptr_mask;
for (j = 0; j <= (count + 32); j++) {
seq_printf(m, "r[%5d]=0x%08x\n", i, ring->ring[i]);
i = (i + 1) & ring->ptr_mask;
if (ring->ready) {
for (j = 0; j <= (count + 32); j++) {
seq_printf(m, "r[%5d]=0x%08x\n", i, ring->ring[i]);
i = (i + 1) & ring->ptr_mask;
}
}
return 0;
}