Re: [PATCH 02/15] megaraid_sas: MFI IO timeout handling

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On 18.12.2015 14:26, Sumit Saxena wrote:
> This patch will do proper error handling for DCMD timeout and failed cases for fusion adapters.
> Below are few key design points-
> 1. For MFI adapters, in case of DCMD timeout(DCMD which must return SUCCESS) driver will call kill adapter. 
> 2. What action needs to be taken in case of DCMD timeout is decided by function dcmd_timeout_ocr_possible().
> DCMD timeout causing OCR is applicable to below DCMDs-
>
> MR_DCMD_PD_LIST_QUERY
> MR_DCMD_LD_GET_LIST
> MR_DCMD_LD_LIST_QUERY
> MR_DCMD_CTRL_SET_CRASH_DUMP_PARAMS
> MR_DCMD_SYSTEM_PD_MAP_GET_INFO(for non pended DCMD)
> MR_DCMD_LD_MAP_GET_INFO(for non pended DCMD)
>
> 3. If DCMD fails from Driver init path, there are certain DCMD which is must to be return SUCCESS. If those DCMD fails,
> driver bail out load. For optional DCMD like pd_info etc, driver continue without executing certain functionality.
>
> Signed-off-by: Sumit Saxena <sumit.saxena@xxxxxxxxxxxxx>
> Signed-off-by: Kashyap Desai <kashyap.desai@xxxxxxxxxxxxx>

Reviewed-by: Tomas Henzl <thenzl@xxxxxxxxxx>

Tomas

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