ath10k: fix diag_read to collect data for larger memory

[Kalle Valo]

Ashok Raj Nagarajan <arnagara at qti.qualcomm.com> wrote:
> diag_read uses dma_alloc_coherent to allocate memory requested by the
> caller. If this memory requested is larger, more than DIAG_TRANSFER_LIMIT
> (2K), then it is likely that we may not get the requested memory and we
> would fail.
> 
> To solve this, request dma_alloc_coherent for only DIAG_TRANSFER_LIMIT, and
> reuse this buffer multiple times as needed to copy the data requested in
> smaller chunks of size not more than DIAG_TRANSFER_LIMIT. Previously we
> were reading into the caller's only after getting the complete requested
> data.
> 
> Fixes: 68c03249f388 ('ath10k: convert pci_alloc_consistent() to dma_alloc_coherent()')
> Signed-off-by: Ashok Raj Nagarajan <arnagara at qti.qualcomm.com>

Thanks, 1 patch applied to ath.git:

1e56d5127d5c ath10k: fix diag_read to collect data for larger memory

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https://patchwork.kernel.org/patch/9135561/