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Date: Fri, 11 Dec 2020 09:11:55 +0800 From: Can Guo <cang@...eaurora.org> To: Bean Huo <huobean@...il.com> Cc: asutoshd@...eaurora.org, nguyenb@...eaurora.org, hongwus@...eaurora.org, rnayak@...eaurora.org, linux-scsi@...r.kernel.org, kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com, Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>, "James E.J. Bottomley" <jejb@...ux.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>, Stanley Chu <stanley.chu@...iatek.com>, Bean Huo <beanhuo@...ron.com>, Bart Van Assche <bvanassche@....org>, Satya Tangirala <satyat@...gle.com>, open list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 2/2] scsi: ufs: Clean up ufshcd_exit_clk_scaling/gating() On 2020-12-11 02:03, Bean Huo wrote: > On Wed, 2020-12-09 at 05:35 -0800, Can Guo wrote: >> ufshcd_hba_exit() is always called after ufshcd_exit_clk_scaling() >> and >> ufshcd_exit_clk_gating(), so move ufshcd_exit_clk_scaling/gating() to >> ufshcd_hba_exit(). >> >> Signed-off-by: Can Guo <cang@...eaurora.org> >> >> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c >> index 12266bd..41a12d6 100644 >> --- a/drivers/scsi/ufs/ufshcd.c >> +++ b/drivers/scsi/ufs/ufshcd.c >> @@ -1846,11 +1846,14 @@ static void ufshcd_init_clk_scaling(struct >> ufs_hba *hba) >> snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d", >> hba->host->host_no); >> hba->clk_scaling.workq = >> create_singlethread_workqueue(wq_name); >> + >> + hba->clk_scaling.is_initialized = true; >> } >> >> static void ufshcd_exit_clk_scaling(struct ufs_hba *hba) >> { >> - if (!ufshcd_is_clkscaling_supported(hba)) >> + if (!ufshcd_is_clkscaling_supported(hba) || >> + !hba->clk_scaling.is_initialized) >> return; >> >> if (hba->devfreq) >> @@ -1894,12 +1897,16 @@ static void ufshcd_init_clk_gating(struct >> ufs_hba *hba) >> hba->clk_gating.enable_attr.attr.mode = 0644; >> if (device_create_file(hba->dev, &hba- >> >clk_gating.enable_attr)) >> dev_err(hba->dev, "Failed to create sysfs for >> clkgate_enable\n"); >> + >> + hba->clk_gating.is_initialized = true; >> } > > you don't need these two is_initialized at all. they are only be false > when scaling/gating is not supported?? > > Bean In the case of scaling/gating are supported, the flags are used in ufshcd_exit_clk_scaling/gating() - when ufshcd_hba_exit() calls ufshcd_exit_clk_scaling/gating(), the two funcs need to make sure they really have something to remove, otherwise NULL pointer issues. Can Guo.
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