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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2023-03-31 13:01:32 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2023-05-24 09:39:34 +0300 |
| commit | 814c96c959cfc147ecf8bf9ae3f34b8361316316 (patch) | |
| tree | 9c0508d7c4e51bf7b342e5036cbdf2d3bae4c272 /drivers/thunderbolt/tunnel.c | |
| parent | 44c026a73be8038f03dbdeef028b642880cf1511 (diff) | |
| download | linux-stable-814c96c959cfc147ecf8bf9ae3f34b8361316316.tar.gz linux-stable-814c96c959cfc147ecf8bf9ae3f34b8361316316.tar.bz2 linux-stable-814c96c959cfc147ecf8bf9ae3f34b8361316316.zip | |
thunderbolt: Check for ring 0 in tb_tunnel_alloc_dma()
Ring 0 cannot be used for anything else than control channel messages.
For this reason add a check to tb_tunnel_alloc_dma() and fail if someone
tries to do that.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/tunnel.c')
| -rw-r--r-- | drivers/thunderbolt/tunnel.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c index 9099ae73e78f..dd3b5613ad2c 100644 --- a/drivers/thunderbolt/tunnel.c +++ b/drivers/thunderbolt/tunnel.c @@ -1452,6 +1452,10 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi, struct tb_path *path; int credits; + /* Ring 0 is reserved for control channel */ + if (WARN_ON(!receive_ring || !transmit_ring)) + return NULL; + if (receive_ring > 0) npaths++; if (transmit_ring > 0) |