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Resolve locking issue for non-sleepable context in the mlx5core.

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Code inspection reveals the busdma unload and free functions
do not write to the belonging dma tag and does not need to be
serialized. This allows mlx5_fwp_free() to be called from
software interrupt context.

MFC after:	3 days
Sponsored by:	Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2017-08-03 09:14:43 +00:00
parent 1d4905b5b0
commit 713dd5cb9e
1 changed files with 0 additions and 3 deletions

3
sys/dev/mlx5/mlx5_core/mlx5_pagealloc.c

@ -190,13 +190,10 @@ mlx5_fwp_free(struct mlx5_fw_page *fwp)
num = fwp->numpages;
dev = fwp->dev;
/* serialize unloading the DMA maps */
sx_xlock(&dev->cmd.dma_sx);
while (num--) {
bus_dmamap_unload(dev->cmd.dma_tag, fwp[num].dma_map);
bus_dmamem_free(dev->cmd.dma_tag, fwp[num].virt_addr, fwp[num].dma_map);
}
sx_xunlock(&dev->cmd.dma_sx);
kfree(fwp);
}