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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: kernelnewbies-bounces@kernelnewbies.org On Wednesday 10 June 2020 08:53:13 CEST Mohamed Dawod wrote: > Hello, > = > I read this point in staging/wfx/TODO file > = > - In wfx_cmd_send(), "async" allow to send command without waiting the re= ply. > It may help in some situation, but it is not yet used. In add, it may= cause > some trouble: > https://lore.kernel.org/driverdev-devel/alpine.DEB.2.21.19100413173= 81.2992@hadrien/ > So, fix it (by replacing the mutex with a semaphore) or drop it. > = > I think that this issue has already been fixed in hif_shutdown() function= , hasn't it ? Indeed, when I wrote the TODO file, the function hif_shutdown() didn't exist yet. > I have another question. How can (replacing the mutex with a semaphore) s= olve the problem? My understanding is that a mutex aims to be acquired and released from the same context. In some specific usages (RT-mutex? lock proving?), acquire mutex from a context and release it from another can produce some errors. In contrary a boolean semaphore does not have this restriction. = (can anyone confirm that?) -- = J=E9r=F4me Pouiller _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies