From patchwork Wed Oct 9 19:10:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 11181949 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 514D7912 for ; Wed, 9 Oct 2019 19:15:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3542C2190F for ; Wed, 9 Oct 2019 19:15:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731731AbfJITLK (ORCPT ); Wed, 9 Oct 2019 15:11:10 -0400 Received: from mout.kundenserver.de ([212.227.126.135]:57341 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731658AbfJITLJ (ORCPT ); Wed, 9 Oct 2019 15:11:09 -0400 Received: from threadripper.lan ([149.172.19.189]) by mrelayeu.kundenserver.de (mreue011 [212.227.15.129]) with ESMTPA (Nemesis) id 1MsI8Y-1hy98y2TMI-00thr3; Wed, 09 Oct 2019 21:11:06 +0200 From: Arnd Bergmann To: Al Viro Cc: linux-kernel@vger.kernel.org, y2038@lists.linaro.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann , Alexandre Belloni Subject: [PATCH v6 10/43] compat_ioctl: move rtc handling into rtc-dev.c Date: Wed, 9 Oct 2019 21:10:10 +0200 Message-Id: <20191009191044.308087-10-arnd@arndb.de> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20191009190853.245077-1-arnd@arndb.de> References: <20191009190853.245077-1-arnd@arndb.de> MIME-Version: 1.0 X-Provags-ID: V03:K1:NQxqHSuGm6672yi9tDjAjsm8/dbLhBUkstX4vP7G+9ZMcvTby8W sKD2xfDzsdRF+p1GLGd0QNFRiF+/YHOkRN6q/4b/Mfh9ooShBkCwkF9rKfvZinq075xadWk NMO0TEAb7bSZVQYiVqRG17LK0STeNDYZEpFVH8qqZ1aTT/VqdkTfBOONE8hGLEUnzxr2Wdd JYY8aGIzV63Vw25jZT/IQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:cLaxGJXuAWg=:4OrBjJuOS2p5ASTVKjHPsH PZfr0hCMMahWEMBlJzs9c28BDfty6anoTXNUD+q2xiVW4Bx4xqIBohxza0pptizLNixKkf0TS Z9Kp7/tknxmkAP+nT3jAM1oHOO0vTJslYoGyRQ246HZzAneMc1CBmoGi302P9I280q2kzM7tq ojwQxoY1I02R1V4/5Gs4ApifFToGn/0c2ukkWo319xLrIksjM2l4x8Oxpcbzr0FyHBPMbSwka Tr95M0OKFHN+6o8Vf3Nk0bndfrSqE81y1x0UOZCYz1Xn3hrbvnu+8KOBcqiHknnEZHlNtLZp7 qJCNNHssim97u7JTeX0XNWzVbhAdz8w711uPXbThA4IwLQUScYloyzFVfqlu6ZQ37ixIcFB0R NqJ7fBDdgQFUvY01r4og2gFb62JSMm/krk7AJf0JEFKp6d6RvfoJyT0KO1pIQ5GPBJjOec4d+ gO5Id56fR54XX+nqdfuVPit8+RQwlbmVtohvlOy1taNUUyPtmFomI03LKi4aaU08/ljsdg6Sn 8HEhJWWV9PHcgGqCp2wdE+hgKLw4isVNpNjypYtqEyjWX+BiHuCdQ8aQE/HBTq4yUgN/+gqWB bNNhkPwS02kg1aoBNPht/FCrqFmVoaSRq0Pd5ZIRPseYVMjnG8NqpXe+WC/YcNwfeUhCtOxrb dIcr8tJzkWmP79l56V7b8dxOq30hV3oOkZB9CkPAI34o8JbylxG1T0iSoMtY/Dzzttm5/3sDY JDlCFw8IYxcF7g9S980KImExtiU9H9gmL8zj1W3zd4gj8aK5X+euNaxqE8gPphehqyqn39l4J fpEpARhiWL7dNomRUsLzYFns+5SrkKEfFtqgo3CbOB3IJDwx4ABjfdr2owl3mn9jBe/IUJKrq vwTiZutfrYPKjY1qIpMg== Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org We no longer need the rtc compat handling to be in common code, now that all drivers are either moved to the rtc-class framework, or (rarely) exist in drivers/char for architectures without compat mode (m68k, alpha and ia64, respectively). I checked the list of ioctl commands in drivers, and the ones that are not already handled are all compatible, again with the one exception of m68k driver, which implements RTC_PLL_GET and RTC_PLL_SET, but has no compat mode. Since the ioctl commands are either compatible or differ in both structure and command code between 32-bit and 64-bit, we can merge the compat handler into the native one and just implement the two common compat commands (RTC_IRQP_READ, RTC_IRQP_SET) there. The result is a slight change in behavior, as a native 64-bit process will now also handle the 32-bit commands (RTC_IRQP_SET32/RTC_IRQP_SET). The old conversion handler also deals with RTC_EPOCH_READ and RTC_EPOCH_SET, which are not handled in rtc-dev.c but only in a single device driver (rtc-vr41xx), so I'm adding the compat version in the same place. I don't expect other drivers to need those commands in the future. Acked-by: Alexandre Belloni Signed-off-by: Arnd Bergmann Reviewed-by: Ben Hutchings --- v2: merge compat handler into ioctl function to avoid the compat_alloc_user_space() roundtrip, based on feedback from Al Viro. --- drivers/rtc/dev.c | 13 +++++++++- drivers/rtc/rtc-vr41xx.c | 10 ++++++++ fs/compat_ioctl.c | 53 ---------------------------------------- 3 files changed, 22 insertions(+), 54 deletions(-) diff --git a/drivers/rtc/dev.c b/drivers/rtc/dev.c index 84feb2565abd..1dc5063f78c9 100644 --- a/drivers/rtc/dev.c +++ b/drivers/rtc/dev.c @@ -10,6 +10,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -357,10 +358,19 @@ static long rtc_dev_ioctl(struct file *file, mutex_unlock(&rtc->ops_lock); return rtc_update_irq_enable(rtc, 0); +#ifdef CONFIG_64BIT +#define RTC_IRQP_SET32 _IOW('p', 0x0c, __u32) +#define RTC_IRQP_READ32 _IOR('p', 0x0b, __u32) + case RTC_IRQP_SET32: + err = rtc_irq_set_freq(rtc, arg); + break; + case RTC_IRQP_READ32: + err = put_user(rtc->irq_freq, (unsigned int __user *)uarg); + break; +#endif case RTC_IRQP_SET: err = rtc_irq_set_freq(rtc, arg); break; - case RTC_IRQP_READ: err = put_user(rtc->irq_freq, (unsigned long __user *)uarg); break; @@ -434,6 +444,7 @@ static const struct file_operations rtc_dev_fops = { .read = rtc_dev_read, .poll = rtc_dev_poll, .unlocked_ioctl = rtc_dev_ioctl, + .compat_ioctl = compat_ptr_ioctl, .open = rtc_dev_open, .release = rtc_dev_release, .fasync = rtc_dev_fasync, diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c index c75230562c0d..79f27de545af 100644 --- a/drivers/rtc/rtc-vr41xx.c +++ b/drivers/rtc/rtc-vr41xx.c @@ -4,6 +4,7 @@ * * Copyright (C) 2003-2008 Yoichi Yuasa */ +#include #include #include #include @@ -66,6 +67,10 @@ static void __iomem *rtc2_base; #define rtc2_read(offset) readw(rtc2_base + (offset)) #define rtc2_write(offset, value) writew((value), rtc2_base + (offset)) +/* 32-bit compat for ioctls that nobody else uses */ +#define RTC_EPOCH_READ32 _IOR('p', 0x0d, __u32) +#define RTC_EPOCH_SET32 _IOW('p', 0x0e, __u32) + static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */ static DEFINE_SPINLOCK(rtc_lock); @@ -179,6 +184,11 @@ static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long switch (cmd) { case RTC_EPOCH_READ: return put_user(epoch, (unsigned long __user *)arg); +#ifdef CONFIG_64BIT + case RTC_EPOCH_READ32: + return put_user(epoch, (unsigned int __user *)arg); + case RTC_EPOCH_SET32: +#endif case RTC_EPOCH_SET: /* Doesn't support before 1900 */ if (arg < 1900) diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index cec3ec0a1727..47da220f95b1 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -32,7 +32,6 @@ #include #include #include -#include #include #include #include @@ -436,37 +435,6 @@ static int mt_ioctl_trans(struct file *file, #define HCIUARTSETFLAGS _IOW('U', 203, int) #define HCIUARTGETFLAGS _IOR('U', 204, int) -#define RTC_IRQP_READ32 _IOR('p', 0x0b, compat_ulong_t) -#define RTC_IRQP_SET32 _IOW('p', 0x0c, compat_ulong_t) -#define RTC_EPOCH_READ32 _IOR('p', 0x0d, compat_ulong_t) -#define RTC_EPOCH_SET32 _IOW('p', 0x0e, compat_ulong_t) - -static int rtc_ioctl(struct file *file, - unsigned cmd, void __user *argp) -{ - unsigned long __user *valp = compat_alloc_user_space(sizeof(*valp)); - int ret; - - if (valp == NULL) - return -EFAULT; - switch (cmd) { - case RTC_IRQP_READ32: - case RTC_EPOCH_READ32: - ret = do_ioctl(file, (cmd == RTC_IRQP_READ32) ? - RTC_IRQP_READ : RTC_EPOCH_READ, - (unsigned long)valp); - if (ret) - return ret; - return convert_in_user(valp, (unsigned int __user *)argp); - case RTC_IRQP_SET32: - return do_ioctl(file, RTC_IRQP_SET, (unsigned long)argp); - case RTC_EPOCH_SET32: - return do_ioctl(file, RTC_EPOCH_SET, (unsigned long)argp); - } - - return -ENOIOCTLCMD; -} - /* * simple reversible transform to make our table more evenly * distributed after sorting. @@ -503,21 +471,6 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI) /* Big V (don't complain on serial console) */ IGNORE_IOCTL(VT_OPENQRY) IGNORE_IOCTL(VT_GETMODE) -/* Little p (/dev/rtc, /dev/envctrl, etc.) */ -COMPATIBLE_IOCTL(RTC_AIE_ON) -COMPATIBLE_IOCTL(RTC_AIE_OFF) -COMPATIBLE_IOCTL(RTC_UIE_ON) -COMPATIBLE_IOCTL(RTC_UIE_OFF) -COMPATIBLE_IOCTL(RTC_PIE_ON) -COMPATIBLE_IOCTL(RTC_PIE_OFF) -COMPATIBLE_IOCTL(RTC_WIE_ON) -COMPATIBLE_IOCTL(RTC_WIE_OFF) -COMPATIBLE_IOCTL(RTC_ALM_SET) -COMPATIBLE_IOCTL(RTC_ALM_READ) -COMPATIBLE_IOCTL(RTC_RD_TIME) -COMPATIBLE_IOCTL(RTC_SET_TIME) -COMPATIBLE_IOCTL(RTC_WKALM_SET) -COMPATIBLE_IOCTL(RTC_WKALM_RD) /* * These two are only for the sbus rtc driver, but * hwclock tries them on every rtc device first when @@ -897,12 +850,6 @@ static long do_ioctl_trans(unsigned int cmd, case MTIOCPOS32: return mt_ioctl_trans(file, cmd, argp); #endif - /* Not implemented in the native kernel */ - case RTC_IRQP_READ32: - case RTC_IRQP_SET32: - case RTC_EPOCH_READ32: - case RTC_EPOCH_SET32: - return rtc_ioctl(file, cmd, argp); } /*