On 1/9/2020 11:30 AM, Dmitry Osipenko wrote:
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09.01.2020 08:09, Sameer Pujar пишет:
This patch adds a macro 'regmap_read_poll_timeout_atomic' that works
similar to 'readx_poll_timeout_atomic' defined in linux/iopoll.h; This
is atomic version of already available 'regmap_read_poll_timeout' macro.
It should be noted that above atomic macro cannot be used by all regmaps.
If the regmap is set up for atomic use (flat or no cache and MMIO) then
only it can use.
Signed-off-by: Sameer Pujar <spujar@xxxxxxxxxx>
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Could you please explain what is the targeted use-case here?
I was trying to use regmap_read_poll_timeout() to poll for status change
of a register. This resulted in "BUG: scheduling while atomic". The
callback function, in which I was trying to use the macro, runs in
atomic context. Hence new atomic macro is added. I was checking ALSA
playback/capture and trigger() callback had to monitor some register status.
In general, the new macro can be used in atomic callbacks where regmap
interface is used and polling is required.
