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| author | Jeffrey Hugo <jhugo@codeaurora.org> | 2021-03-10 13:49:25 -0700 |
|---|---|---|
| committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2021-03-16 11:47:31 +0530 |
| commit | 9e40641f62cd812b21f2c73b5cfb3346eb466dea (patch) | |
| tree | 90f7acc88b71b4c5a3460bc0b2dfcfdb2e0f09f3 /drivers/bus | |
| parent | 68731852f6e58d19f692971dc84deb64265f6d3f (diff) | |
| download | linux-9e40641f62cd812b21f2c73b5cfb3346eb466dea.tar.gz linux-9e40641f62cd812b21f2c73b5cfb3346eb466dea.tar.bz2 linux-9e40641f62cd812b21f2c73b5cfb3346eb466dea.zip | |
bus: mhi: core: Check state before processing power_down
We cannot process a power_down if the power state is DISABLED. There is
no valid mhi_ctxt in that case, so attepting to process the power_down
will likely result in a null pointer dereference. If the power state is
DISABLED, there is nothing to do anyways, so just bail early.
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1615409365-8165-1-git-send-email-jhugo@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/mhi/core/pm.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index adb0e80974f1..fbe944730401 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -1134,6 +1134,7 @@ error_setup_irq: mhi_deinit_dev_ctxt(mhi_cntrl); error_dev_ctxt: + mhi_cntrl->pm_state = MHI_PM_DISABLE; mutex_unlock(&mhi_cntrl->pm_mutex); return ret; @@ -1145,12 +1146,19 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) enum mhi_pm_state cur_state, transition_state; struct device *dev = &mhi_cntrl->mhi_dev->dev; + mutex_lock(&mhi_cntrl->pm_mutex); + write_lock_irq(&mhi_cntrl->pm_lock); + cur_state = mhi_cntrl->pm_state; + if (cur_state == MHI_PM_DISABLE) { + write_unlock_irq(&mhi_cntrl->pm_lock); + mutex_unlock(&mhi_cntrl->pm_mutex); + return; /* Already powered down */ + } + /* If it's not a graceful shutdown, force MHI to linkdown state */ transition_state = (graceful) ? MHI_PM_SHUTDOWN_PROCESS : MHI_PM_LD_ERR_FATAL_DETECT; - mutex_lock(&mhi_cntrl->pm_mutex); - write_lock_irq(&mhi_cntrl->pm_lock); cur_state = mhi_tryset_pm_state(mhi_cntrl, transition_state); if (cur_state != transition_state) { dev_err(dev, "Failed to move to state: %s from: %s\n", |