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Message-ID: <CAK7LNAR2g2Edm-CMxLaRLs4hHM_4-FWkKFwRjmPgnuVSTTXU0g@mail.gmail.com> Date: Fri, 3 Jul 2015 19:17:11 +0900 From: Masahiro Yamada <yamada.masahiro@...ionext.com> To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: [Question] Usage of ENOTSUPP error code Hello experts, I noticed many drivers return -ENOTSUPP on error. I assume ENOTSUPP is defined in include/linux/errno.h as follows: /* Defined for the NFSv3 protocol */ #define EBADHANDLE 521 /* Illegal NFS file handle */ #define ENOTSYNC 522 /* Update synchronization mismatch */ #define EBADCOOKIE 523 /* Cookie is stale */ #define ENOTSUPP 524 /* Operation is not supported */ #define ETOOSMALL 525 /* Buffer or request is too small */ #define ESERVERFAULT 526 /* An untranslatable error occurred */ #define EBADTYPE 527 /* Type not supported by server */ #define EJUKEBOX 528 /* Request initiated, but will not complete before timeout */ #define EIOCBQUEUED 529 /* iocb queued, will get completion event */ I also assume the comment "Defined for the NFSv3 protocol" is valid for whole of this block. If so, should ENOTSUPP be only used for NFS-related errors? In fact, ENOTSUPP is used by various drivers including non-network ones such as pinctrl, USB, etc. -- Best Regards Masahiro Yamada -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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