[PATCH V2] ath10k: don't fail if IRAM write fails

[ojab //]

See also: https://lists.infradead.org/pipermail/ath10k/2021-May/012626.html

On Thu, 22 Jul 2021 at 22:36, ojab <ojab at ojab.ru> wrote:
>
> After reboot with kernel & firmware updates I found `failed to copy
> target iram contents:` in dmesg and missing wlan interfaces for both
> of my QCA9984 compex cards. Rolling back kernel/firmware didn't fixed
> it, so while I have no idea what's actually happening, I don't see why
> we should fail in this case, looks like some optional firmware ability
> that could be skipped.
>
> Also with additional logging there is
> ```
> [    6.839858] ath10k_pci 0000:04:00.0: No hardware memory
> [    6.841205] ath10k_pci 0000:04:00.0: failed to copy target iram contents: -12
> [    6.873578] ath10k_pci 0000:07:00.0: No hardware memory
> [    6.875052] ath10k_pci 0000:07:00.0: failed to copy target iram contents: -12
> ```
> so exact branch could be seen.
>
> Signed-off-by: Slava Kardakov <ojab at ojab.ru>
> ---
>  Of course I forgot to sing off, since I don't use it by default because I
>  hate my real name and kernel requires it
>
>  drivers/net/wireless/ath/ath10k/core.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
> index 2f9be182fbfb..d9fd5294e142 100644
> --- a/drivers/net/wireless/ath/ath10k/core.c
> +++ b/drivers/net/wireless/ath/ath10k/core.c
> @@ -2691,8 +2691,10 @@ static int ath10k_core_copy_target_iram(struct ath10k *ar)
>         u32 len, remaining_len;
>
>         hw_mem = ath10k_coredump_get_mem_layout(ar);
> -       if (!hw_mem)
> +       if (!hw_mem) {
> +               ath10k_warn(ar, "No hardware memory");
>                 return -ENOMEM;
> +       }
>
>         for (i = 0; i < hw_mem->region_table.size; i++) {
>                 tmp = &hw_mem->region_table.regions[i];
> @@ -2702,8 +2704,10 @@ static int ath10k_core_copy_target_iram(struct ath10k *ar)
>                 }
>         }
>
> -       if (!mem_region)
> +       if (!mem_region) {
> +               ath10k_warn(ar, "No memory region");
>                 return -ENOMEM;
> +       }
>
>         for (i = 0; i < ar->wmi.num_mem_chunks; i++) {
>                 if (ar->wmi.mem_chunks[i].req_id ==
> @@ -2917,7 +2921,6 @@ int ath10k_core_start(struct ath10k *ar, enum ath10k_firmware_mode mode,
>                 if (status) {
>                         ath10k_warn(ar, "failed to copy target iram contents: %d",
>                                     status);
> -                       goto err_hif_stop;
>                 }
>         }
>
> --
> 2.32.0