Messages in this thread Patch in this message |  | | Date | Mon, 16 Dec 2019 22:31:29 +0800 | From | cang@codeauro ... | Subject | Re: [PATCH 1/2] scsi: ufs: Put SCSI host after remove it |
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On 2019-12-15 02:32, Bart Van Assche wrote: > On 12/14/19 8:03 AM, Can Guo wrote: >> In ufshcd_remove(), after SCSI host is removed, put it once so that >> its >> resources can be released. >> >> Signed-off-by: Can Guo <cang@codeaurora.org> >> >> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c >> index b5966fa..a86b0fd 100644 >> --- a/drivers/scsi/ufs/ufshcd.c >> +++ b/drivers/scsi/ufs/ufshcd.c >> @@ -8251,6 +8251,7 @@ void ufshcd_remove(struct ufs_hba *hba) >> ufs_bsg_remove(hba); >> ufs_sysfs_remove_nodes(hba->dev); >> scsi_remove_host(hba->host); >> + scsi_host_put(hba->host); >> /* disable interrupts */ >> ufshcd_disable_intr(hba, hba->intr_mask); >> ufshcd_hba_stop(hba, true); > > Hi Can, > > The UFS driver may queue work asynchronously and that asynchronous > work may refer to the SCSI host, e.g. ufshcd_err_handler(). Is it > guaranteed that all that asynchronous work has finished before > scsi_host_put() is called? > > Thanks, > > Bart.
Hi Bart,
As SCSI host is allocated in ufshcd_platform_init() during platform drive probe, it is much more appropriate if platform driver calls ufshcd_dealloc_host() in their own drv->remove() path. How do you think if I change it as below? If it is OK to you, please ignore my previous mails.
diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 3d4582e..ea45756 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -3239,6 +3239,7 @@ static int ufs_qcom_remove(struct platform_device *pdev)
pm_runtime_get_sync(&(pdev)->dev); ufshcd_remove(hba); + ufshcd_dealloc_host(hba); return 0; }
Thanks, Can Guo.
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