Re: [PATCH v4 2/3] hw/ufs: Support for Query Transfer Requests

[Stefan Hajnoczi]

On Tue, Jul 04, 2023 at 05:33:58PM +0900, Jeuk Kim wrote:
> +static MemTxResult ufs_dma_read_prdt(UfsRequest *req)
> +{
> +    UfsHc *u = req->hc;
> +    uint16_t prdt_len = le16_to_cpu(req->utrd.prd_table_length);
> +    uint16_t prdt_byte_off =
> +        le16_to_cpu(req->utrd.prd_table_offset) * sizeof(uint32_t);
> +    uint32_t prdt_size = prdt_len * sizeof(UfshcdSgEntry);
> +    g_autofree UfshcdSgEntry *prd_entries = NULL;
> +    hwaddr req_upiu_base_addr, prdt_base_addr;
> +    int err;
> +
> +    assert(!req->sg);
> +
> +    if (prdt_len == 0) {
> +        return MEMTX_OK;
> +    }
> +
> +    prd_entries = g_new(UfshcdSgEntry, prdt_size);
> +    if (!prd_entries) {

g_new() never returns NULL. The process aborts if there is not enough
memory available.

Use g_try_new() if you want to handle memory allocation failure.

> +        trace_ufs_err_memory_allocation();
> +        return MEMTX_ERROR;
> +    }
> +
> +    req_upiu_base_addr = ufs_get_req_upiu_base_addr(&req->utrd);
> +    prdt_base_addr = req_upiu_base_addr + prdt_byte_off;
> +
> +    err = ufs_addr_read(u, prdt_base_addr, prd_entries, prdt_size);
> +    if (err) {
> +        trace_ufs_err_dma_read_prdt(req->slot, prdt_base_addr);
> +        return err;
> +    }
> +
> +    req->sg = g_malloc0(sizeof(QEMUSGList));
> +    if (!req->sg) {

g_malloc0() never returns NULL. The process aborts if there is not
enough memory available.

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