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habanalabs: remove dead code from free_device_memory()

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free_device_memory() ends with if and else, each has a return statement,
followed by another return statement that can never be reached.
Restructure the function and remove this dead code.

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Tomer Tayar 2022-06-24 13:05:23 +03:00 committed by Oded Gabbay
parent be882e534f
commit a74cf4a8f6
1 changed files with 25 additions and 31 deletions
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56
drivers/misc/habanalabs/common/memory.c
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@ -359,41 +359,35 @@ static int free_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args)
spin_lock(&vm->idr_lock);
phys_pg_pack = idr_find(&vm->phys_pg_pack_handles, handle);
if (phys_pg_pack) {
if (atomic_read(&phys_pg_pack->mapping_cnt) > 0) {
dev_err(hdev->dev, "handle %u is mapped, cannot free\n",
handle);
spin_unlock(&vm->idr_lock);
return -EINVAL;
}
if (phys_pg_pack->exporting_cnt) {
dev_dbg(hdev->dev, "handle %u is exported, cannot free\n", handle);
spin_unlock(&vm->idr_lock);
return -EINVAL;
}
/*
* must remove from idr before the freeing of the physical
* pages as the refcount of the pool is also the trigger of the
* idr destroy
*/
idr_remove(&vm->phys_pg_pack_handles, handle);
if (!phys_pg_pack) {
spin_unlock(&vm->idr_lock);
atomic64_sub(phys_pg_pack->total_size, &ctx->dram_phys_mem);
atomic64_sub(phys_pg_pack->total_size, &hdev->dram_used_mem);
free_phys_pg_pack(hdev, phys_pg_pack);
return 0;
} else {
spin_unlock(&vm->idr_lock);
dev_err(hdev->dev,
"free device memory failed, no match for handle %u\n",
handle);
dev_err(hdev->dev, "free device memory failed, no match for handle %u\n", handle);
return -EINVAL;
}
if (atomic_read(&phys_pg_pack->mapping_cnt) > 0) {
spin_unlock(&vm->idr_lock);
dev_err(hdev->dev, "handle %u is mapped, cannot free\n", handle);
return -EINVAL;
}
if (phys_pg_pack->exporting_cnt) {
spin_unlock(&vm->idr_lock);
dev_dbg(hdev->dev, "handle %u is exported, cannot free\n", handle);
return -EINVAL;
}
/* must remove from idr before the freeing of the physical pages as the refcount of the pool
* is also the trigger of the idr destroy
*/
idr_remove(&vm->phys_pg_pack_handles, handle);
spin_unlock(&vm->idr_lock);
atomic64_sub(phys_pg_pack->total_size, &ctx->dram_phys_mem);
atomic64_sub(phys_pg_pack->total_size, &hdev->dram_used_mem);
free_phys_pg_pack(hdev, phys_pg_pack);
return 0;
}