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thunderbolt: Check for ring 0 in tb_tunnel_alloc_dma()

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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>
This commit is contained in:
Mika Westerberg 2023-03-31 13:01:32 +03:00
parent 44c026a73b
commit 814c96c959
1 changed files with 4 additions and 0 deletions
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4
drivers/thunderbolt/tunnel.c
View file

@ -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)