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    Subject[PATCH v2] scsi: ufshcd: fix possible unclocked register access
    Date
    Vendor specific setup_clocks callback may require the clocks managed
    by ufshcd driver to be ON. So if the vendor specific setup_clocks callback
    is called while the required clocks are turned off, it could result into
    unclocked register access.

    To prevent possible unclock register access, this change makes sure that
    required clocks remain enabled before calling into vendor specific
    setup_clocks callback.

    Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
    ---
    Changes from v2:
    * Don't call ufshcd_vops_setup_clocks() again for clock off
    ---
    drivers/scsi/ufs/ufshcd.c | 22 +++++++++++++++++++++-
    1 file changed, 21 insertions(+), 1 deletion(-)

    diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
    index 05c7456..c1a77d3 100644
    --- a/drivers/scsi/ufs/ufshcd.c
    +++ b/drivers/scsi/ufs/ufshcd.c
    @@ -5389,6 +5389,17 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
    if (!head || list_empty(head))
    goto out;

    + /*
    + * vendor specific setup_clocks ops may depend on clocks managed by
    + * this standard driver hence call the vendor specific setup_clocks
    + * before disabling the clocks managed here.
    + */
    + if (!on) {
    + ret = ufshcd_vops_setup_clocks(hba, on);
    + if (ret)
    + return ret;
    + }
    +
    list_for_each_entry(clki, head, list) {
    if (!IS_ERR_OR_NULL(clki->clk)) {
    if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
    @@ -5410,7 +5421,16 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
    }
    }

    - ret = ufshcd_vops_setup_clocks(hba, on);
    + /*
    + * vendor specific setup_clocks ops may depend on clocks managed by
    + * this standard driver hence call the vendor specific setup_clocks
    + * after enabling the clocks managed here.
    + */
    + if (on) {
    + ret = ufshcd_vops_setup_clocks(hba, on);
    + if (ret)
    + return ret;
    + }
    out:
    if (ret) {
    list_for_each_entry(clki, head, list) {
    --
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
    a Linux Foundation Collaborative Project
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