scsi: ufshcd: Fix NULL pointer dereference for in ufshcd_init
Error paths in ufshcd_init() ufshcd_hba_exit() killed clk_scaling workqueue
when the workqueue is actually created quite late in ufshcd_init(). So, we
end up getting NULL pointer dereference in such error paths. Fix this by
moving clk_scaling initialization and kill codes to two separate methods, and
call them at required places.
Fixes: 401f1e4490
("scsi: ufs: don't suspend clock scaling during clock
gating")
Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Subhash Jadavani <subhashj@codeaurora.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Evan Green <evgreen@chromium.org>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Родитель
94e989dee2
Коммит
eebcc19646
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@ -1763,6 +1763,34 @@ out:
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return count;
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}
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static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
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{
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char wq_name[sizeof("ufs_clkscaling_00")];
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if (!ufshcd_is_clkscaling_supported(hba))
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return;
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INIT_WORK(&hba->clk_scaling.suspend_work,
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ufshcd_clk_scaling_suspend_work);
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INIT_WORK(&hba->clk_scaling.resume_work,
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ufshcd_clk_scaling_resume_work);
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snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
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hba->host->host_no);
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hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);
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ufshcd_clkscaling_init_sysfs(hba);
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}
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static void ufshcd_exit_clk_scaling(struct ufs_hba *hba)
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{
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if (!ufshcd_is_clkscaling_supported(hba))
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return;
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destroy_workqueue(hba->clk_scaling.workq);
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ufshcd_devfreq_remove(hba);
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}
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static void ufshcd_init_clk_gating(struct ufs_hba *hba)
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{
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char wq_name[sizeof("ufs_clk_gating_00")];
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@ -6666,6 +6694,7 @@ out:
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*/
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if (ret && !ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) {
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pm_runtime_put_sync(hba->dev);
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ufshcd_exit_clk_scaling(hba);
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ufshcd_hba_exit(hba);
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}
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@ -7201,12 +7230,9 @@ static void ufshcd_hba_exit(struct ufs_hba *hba)
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ufshcd_variant_hba_exit(hba);
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ufshcd_setup_vreg(hba, false);
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ufshcd_suspend_clkscaling(hba);
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if (ufshcd_is_clkscaling_supported(hba)) {
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if (ufshcd_is_clkscaling_supported(hba))
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if (hba->devfreq)
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ufshcd_suspend_clkscaling(hba);
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destroy_workqueue(hba->clk_scaling.workq);
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ufshcd_devfreq_remove(hba);
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}
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ufshcd_setup_clocks(hba, false);
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ufshcd_setup_hba_vreg(hba, false);
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hba->is_powered = false;
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@ -7881,6 +7907,7 @@ void ufshcd_remove(struct ufs_hba *hba)
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ufshcd_disable_intr(hba, hba->intr_mask);
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ufshcd_hba_stop(hba, true);
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ufshcd_exit_clk_scaling(hba);
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ufshcd_exit_clk_gating(hba);
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if (ufshcd_is_clkscaling_supported(hba))
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device_remove_file(hba->dev, &hba->clk_scaling.enable_attr);
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@ -8045,6 +8072,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
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ufshcd_init_clk_gating(hba);
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ufshcd_init_clk_scaling(hba);
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/*
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* In order to avoid any spurious interrupt immediately after
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* registering UFS controller interrupt handler, clear any pending UFS
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@ -8083,21 +8112,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
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goto out_remove_scsi_host;
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}
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if (ufshcd_is_clkscaling_supported(hba)) {
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char wq_name[sizeof("ufs_clkscaling_00")];
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INIT_WORK(&hba->clk_scaling.suspend_work,
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ufshcd_clk_scaling_suspend_work);
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INIT_WORK(&hba->clk_scaling.resume_work,
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ufshcd_clk_scaling_resume_work);
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snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
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host->host_no);
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hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);
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ufshcd_clkscaling_init_sysfs(hba);
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}
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/*
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* Set the default power management level for runtime and system PM.
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* Default power saving mode is to keep UFS link in Hibern8 state
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@ -8135,6 +8149,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
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out_remove_scsi_host:
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scsi_remove_host(hba->host);
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exit_gating:
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ufshcd_exit_clk_scaling(hba);
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ufshcd_exit_clk_gating(hba);
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out_disable:
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hba->is_irq_enabled = false;
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