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scsi: ufs: Check qcg before dereferencing

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Check qcg before dereferencing to avoid NULL pointer
dereference and return if its NULL. This is is to
fix below kw warnings.

ufs-qcom.c:2489: 'qcg' is assigned the return value from
function 'cpu_to_group'.
ufs-qcom.c:2439: 'cpu_to_group' explicitly returns
a NULL value.
ufs-qcom.c:2490: 'qcg' is explicitly dereferenced.

Change-Id: I291c9230bb7fb5df414db8f80bfb17a50c8fc7cf
Signed-off-by: Nitin Rawat <nitirawa@codeaurora.org>
This commit is contained in:
Nitin Rawat 2020-11-20 13:43:34 +05:30
commit d553a0ff41
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/ufs/ufs-qcom.c
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@ -2487,6 +2487,9 @@ static void ufs_qcom_qos(struct ufs_hba *hba, int tag, bool is_scsi_cmd)
if (cpu < 0)
return;
qcg = cpu_to_group(host->ufs_qos, cpu);
if (!qcg)
return;
if (qcg->voted) {
dev_dbg(qcg->host->hba->dev, "%s: qcg: 0x%08x | Mask: 0x%08x - Already voted - return\n",
__func__, qcg, qcg->mask);