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smb: server: make sure we call ib_dma_unmap_single() only if we called ib_dma_map_single already

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[ Upstream commit afb4108c92 ]

In case of failures either ib_dma_map_single() might not be called yet
or ib_dma_unmap_single() was already called.

We should make sure put_recvmsg() only calls ib_dma_unmap_single() if needed.

Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Fixes: 0626e6641f ("cifsd: add server handler for central processing and tranport layers")
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stefan Metzmacher 2025-08-04 14:15:51 +02:00 committed by Greg Kroah-Hartman
parent 16a32dde89
commit a467c6cc13
1 changed files with 9 additions and 2 deletions
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11
fs/smb/server/transport_rdma.c
View File

@ -265,8 +265,13 @@ smb_direct_recvmsg *get_free_recvmsg(struct smb_direct_transport *t)
static void put_recvmsg(struct smb_direct_transport *t,
struct smb_direct_recvmsg *recvmsg)
{
ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr,
recvmsg->sge.length, DMA_FROM_DEVICE);
if (likely(recvmsg->sge.length != 0)) {
ib_dma_unmap_single(t->cm_id->device,
recvmsg->sge.addr,
recvmsg->sge.length,
DMA_FROM_DEVICE);
recvmsg->sge.length = 0;
}
spin_lock(&t->recvmsg_queue_lock);
list_add(&recvmsg->list, &t->recvmsg_queue);
@ -638,6 +643,7 @@ static int smb_direct_post_recv(struct smb_direct_transport *t,
ib_dma_unmap_single(t->cm_id->device,
recvmsg->sge.addr, recvmsg->sge.length,
DMA_FROM_DEVICE);
recvmsg->sge.length = 0;
smb_direct_disconnect_rdma_connection(t);
return ret;
}
@ -1819,6 +1825,7 @@ static int smb_direct_create_pools(struct smb_direct_transport *t)
if (!recvmsg)
goto err;
recvmsg->transport = t;
recvmsg->sge.length = 0;
list_add(&recvmsg->list, &t->recvmsg_queue);
}
t->count_avail_recvmsg = t->recv_credit_max;