diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ufs/core/ufs-mcq.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c index 1b3062577945..c1b1d67a1ddc 100644 --- a/drivers/ufs/core/ufs-mcq.c +++ b/drivers/ufs/core/ufs-mcq.c @@ -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, struct ufs_hw_queue *hwq) { |