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serial: core: Fix runtime PM handling for pending tx
commit 6f699743aebf07538e506a46c5965eb8bdd2c716 upstream. Richard reported that a serial port may end up sometimes with tx data pending in the buffer for long periods of time. Turns out we bail out early on any errors from pm_runtime_get(), including -EINPROGRESS. To fix the issue, we need to ignore -EINPROGRESS as we only care about the runtime PM usage count at this point. We check for an active runtime PM state later on for tx. Fixes: 84a9582f ("serial: core: Start managing serial controllers to enable runtime PM") Cc: stable <stable@kernel.org> Reported-by:Richard Purdie <richard.purdie@linuxfoundation.org> Cc: Bruce Ashfield <bruce.ashfield@gmail.com> Cc: Mikko Rapeli <mikko.rapeli@linaro.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Randy MacLeod <randy.macleod@windriver.com> Signed-off-by:
Tony Lindgren <tony@atomide.com> Tested-by:
Richard Purdie <richard.purdie@linuxfoundation.org> Link: https://lore.kernel.org/r/20231023074856.61896-1-tony@atomide.com Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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