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soundwire: bus: Fix unbalanced pm_runtime_put() causing usage count underflow
[ Upstream commite953796251
] This reverts commit443a98e649
("soundwire: bus: use pm_runtime_resume_and_get()") Change calls to pm_runtime_resume_and_get() back to pm_runtime_get_sync(). This fixes a usage count underrun caused by doing a pm_runtime_put() even though pm_runtime_resume_and_get() returned an error. The three affected functions ignore -EACCES error from trying to get pm_runtime, and carry on, including a put at the end of the function. But pm_runtime_resume_and_get() does not increment the usage count if it returns an error. So in the -EACCES case you must not call pm_runtime_put(). The documentation for pm_runtime_get_sync() says: "Consider using pm_runtime_resume_and_get() ... as this is likely to result in cleaner code." In this case I don't think it results in cleaner code because the pm_runtime_put() at the end of the function would have to be conditional on the return value from pm_runtime_resume_and_get() at the top of the function. pm_runtime_get_sync() doesn't have this problem because it always increments the count, so always needs a put. The code can just flow through and do the pm_runtime_put() unconditionally. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20230406134640.8582-1-rf@opensource.cirrus.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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parent
60eb1afb4f
commit
4e5e9da139
1 changed files with 10 additions and 5 deletions
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@ -571,9 +571,11 @@ int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
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{
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int ret;
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ret = pm_runtime_resume_and_get(&slave->dev);
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if (ret < 0 && ret != -EACCES)
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ret = pm_runtime_get_sync(&slave->dev);
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if (ret < 0 && ret != -EACCES) {
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pm_runtime_put_noidle(&slave->dev);
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return ret;
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}
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ret = sdw_nread_no_pm(slave, addr, count, val);
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@ -595,9 +597,11 @@ int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
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{
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int ret;
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ret = pm_runtime_resume_and_get(&slave->dev);
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if (ret < 0 && ret != -EACCES)
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ret = pm_runtime_get_sync(&slave->dev);
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if (ret < 0 && ret != -EACCES) {
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pm_runtime_put_noidle(&slave->dev);
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return ret;
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}
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ret = sdw_nwrite_no_pm(slave, addr, count, val);
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@ -1565,9 +1569,10 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave)
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sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
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ret = pm_runtime_resume_and_get(&slave->dev);
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ret = pm_runtime_get_sync(&slave->dev);
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if (ret < 0 && ret != -EACCES) {
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dev_err(&slave->dev, "Failed to resume device: %d\n", ret);
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pm_runtime_put_noidle(&slave->dev);
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return ret;
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}
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