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bus: mhi: core: Remove double locking from mhi_driver_remove()

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[ Upstream commit 9b627c25e7 ]

There is double acquisition of the pm_lock from mhi_driver_remove()
function. Remove the read_lock_bh/read_unlock_bh calls for pm_lock
taken during a call to mhi_device_put() as the lock is acquired
within the function already. This will help avoid a potential
kernel panic.

Fixes: 189ff97cca ("bus: mhi: core: Add support for data transfer")
Reported-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bhaumik Bhatt 2020-10-15 11:47:51 -07:00 committed by Greg Kroah-Hartman
parent d2fd75615c
commit 417602ef3f
1 changed files with 0 additions and 2 deletions
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2
drivers/bus/mhi/core/init.c
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@ -1276,10 +1276,8 @@ static int mhi_driver_remove(struct device *dev)
mutex_unlock(&mhi_chan->mutex);
}
read_lock_bh(&mhi_cntrl->pm_lock);
while (mhi_dev->dev_wake)
mhi_device_put(mhi_dev);
read_unlock_bh(&mhi_cntrl->pm_lock);
return 0;
}