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scsi: ufs: core: Add a comment block above ufshcd_mcq_compl_all_cqes_lock()

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Document the aspects of ufshcd_mcq_compl_all_cqes_lock() that are
nontrivial in a comment block above this function.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Link: https://patch.msgid.link/20260401202506.1445324-2-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2026-04-01 13:24:59 -07:00 committed by Martin K. Petersen
parent 1821f77fda
commit 1373df88d5
1 changed files with 8 additions and 0 deletions
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8
drivers/ufs/core/ufs-mcq.c
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@ -322,6 +322,14 @@ static void ufshcd_mcq_process_cqe(struct ufs_hba *hba,
} }
} }
/*
* This function is called from the UFS error handler with the UFS host
* controller disabled (HCE = 0). Reading host controller registers, e.g. the
* CQ tail pointer (CQTPy), may not be safe with the host controller disabled.
* Hence, iterate over all completion queue entries. This won't result in
* double completions because ufshcd_mcq_process_cqe() clears a CQE after it
* has been processed.
*/
void ufshcd_mcq_compl_all_cqes_lock(struct ufs_hba *hba, void ufshcd_mcq_compl_all_cqes_lock(struct ufs_hba *hba,
struct ufs_hw_queue *hwq) struct ufs_hw_queue *hwq)
{ {