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Date: Tue, 12 Jan 2021 09:03:17 +0000 From: John Garry <john.garry@...wei.com> To: Bean Huo <huobean@...il.com>, <alim.akhtar@...sung.com>, <avri.altman@....com>, <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>, <ebiggers@...gle.com>, <satyat@...gle.com>, <shipujin.t@...il.com> CC: <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Bean Huo <beanhuo@...ron.com> Subject: Re: [PATCH v2 1/2] scsi: hisi_sas: Remove unnecessary devm_kfree On 11/01/2021 23:10, Bean Huo wrote: > From: Bean Huo <beanhuo@...ron.com> > > The memory allocated with devm_kzalloc() is freed automatically > no need to explicitly call devm_kfree. > This change is not right - we use devm_kfree() to manually release the devm-allocated debugfs memories upon memory allocation failure for driver debugfs feature during probe. The reason is that we allow the driver probe can still continue (for this failure). Thanks, John > Signed-off-by: Bean Huo <beanhuo@...ron.com> > --- > drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 28 +------------------------- > 1 file changed, 1 insertion(+), 27 deletions(-) > > diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c > index 91a7286e8102..5600411a0820 100644 > --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c > +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c > @@ -4172,30 +4172,6 @@ static void debugfs_work_handler_v3_hw(struct work_struct *work) > hisi_hba->debugfs_dump_index++; > } > > -static void debugfs_release_v3_hw(struct hisi_hba *hisi_hba, int dump_index) > -{ > - struct device *dev = hisi_hba->dev; > - int i; > - > - devm_kfree(dev, hisi_hba->debugfs_iost_cache[dump_index].cache); > - devm_kfree(dev, hisi_hba->debugfs_itct_cache[dump_index].cache); > - devm_kfree(dev, hisi_hba->debugfs_iost[dump_index].iost); > - devm_kfree(dev, hisi_hba->debugfs_itct[dump_index].itct); > - > - for (i = 0; i < hisi_hba->queue_count; i++) > - devm_kfree(dev, hisi_hba->debugfs_dq[dump_index][i].hdr); > - > - for (i = 0; i < hisi_hba->queue_count; i++) > - devm_kfree(dev, > - hisi_hba->debugfs_cq[dump_index][i].complete_hdr); > - > - for (i = 0; i < DEBUGFS_REGS_NUM; i++) > - devm_kfree(dev, hisi_hba->debugfs_regs[dump_index][i].data); > - > - for (i = 0; i < hisi_hba->n_phy; i++) > - devm_kfree(dev, hisi_hba->debugfs_port_reg[dump_index][i].data); > -} > - > static const struct hisi_sas_debugfs_reg *debugfs_reg_array_v3_hw[DEBUGFS_REGS_NUM] = { > [DEBUGFS_GLOBAL] = &debugfs_global_reg, > [DEBUGFS_AXI] = &debugfs_axi_reg, > @@ -4206,7 +4182,7 @@ static int debugfs_alloc_v3_hw(struct hisi_hba *hisi_hba, int dump_index) > { > const struct hisi_sas_hw *hw = hisi_hba->hw; > struct device *dev = hisi_hba->dev; > - int p, c, d, r, i; > + int p, c, d, r; > size_t sz; > > for (r = 0; r < DEBUGFS_REGS_NUM; r++) { > @@ -4286,8 +4262,6 @@ static int debugfs_alloc_v3_hw(struct hisi_hba *hisi_hba, int dump_index) > > return 0; > fail: > - for (i = 0; i < hisi_sas_debugfs_dump_count; i++) > - debugfs_release_v3_hw(hisi_hba, i); > return -ENOMEM; > } > >
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