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RDMA/mlx5: reduce stack usage in mlx5_ib_ufile_hw_cleanup
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This function has an array of eight mlx5_async_cmd structures, which
often fits on the stack, but depending on the configuration can
end up blowing the stack frame warning limit:

drivers/infiniband/hw/mlx5/devx.c:2670:6: error: stack frame size (1392) exceeds limit (1280) in 'mlx5_ib_ufile_hw_cleanup' [-Werror,-Wframe-larger-than]

Change this to a dynamic allocation instead. While a kmalloc()
can theoretically fail, a GFP_KERNEL allocation under a page will
block until memory has been freed up, so in the worst case, this
only adds extra time in an already constrained environment.

Fixes: 7c891a4 ("RDMA/mlx5: Add implementation for ufile_hw_cleanup device operation")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20250610092846.2642535-1-arnd@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
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Arnd Bergmann authored and Leon Romanovsky committed Jun 12, 2025
1 parent 19272b3 commit b26852d
Showing 1 changed file with 7 additions and 1 deletion.
8 changes: 7 additions & 1 deletion drivers/infiniband/hw/mlx5/devx.c
Original file line number Diff line number Diff line change
Expand Up @@ -2669,7 +2669,7 @@ static void devx_wait_async_destroy(struct mlx5_async_cmd *cmd)

void mlx5_ib_ufile_hw_cleanup(struct ib_uverbs_file *ufile)
{
struct mlx5_async_cmd async_cmd[MAX_ASYNC_CMDS];
struct mlx5_async_cmd *async_cmd;
struct ib_ucontext *ucontext = ufile->ucontext;
struct ib_device *device = ucontext->device;
struct mlx5_ib_dev *dev = to_mdev(device);
Expand All @@ -2678,6 +2678,10 @@ void mlx5_ib_ufile_hw_cleanup(struct ib_uverbs_file *ufile)
int head = 0;
int tail = 0;

async_cmd = kcalloc(MAX_ASYNC_CMDS, sizeof(*async_cmd), GFP_KERNEL);
if (!async_cmd)
return;

list_for_each_entry(uobject, &ufile->uobjects, list) {
WARN_ON(uverbs_try_lock_object(uobject, UVERBS_LOOKUP_WRITE));

Expand Down Expand Up @@ -2713,6 +2717,8 @@ void mlx5_ib_ufile_hw_cleanup(struct ib_uverbs_file *ufile)
devx_wait_async_destroy(&async_cmd[head % MAX_ASYNC_CMDS]);
head++;
}

kfree(async_cmd);
}

static ssize_t devx_async_cmd_event_read(struct file *filp, char __user *buf,
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