From patchwork Thu Jan 18 07:57:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jiri Slaby \(SUSE\)" X-Patchwork-Id: 763877 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 057BE20B02; Thu, 18 Jan 2024 07:58:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705564697; cv=none; b=Ids3QFz++Ss2nJGN5JqGLVwLpytz5KHn/mOX/vyVGpO5YnnzQ/WubRXrRiPOFFevmFEIRvBvGBJS7YklZgcqwKZtUe/4d1tmIOah/EjH+f9jEgWoRpyEbn4OJYDI55ZCdZ/CTwzgtHlgOXuvxTJWhHqlnbhX6GlVmxJzsCPSy2k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705564697; c=relaxed/simple; bh=mbeOO3/wQG7zrKVPovwISN/Vz9cG62FT4cGebtEkkis=; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; b=U61vyv2Aqj+aTYf+BY1SCLLWVEX3/7eg8AUWlBGcQkeO/HkuIOnMHl6srVirUI2USzjiKXn67iSEcsMpnOZfSU90qwWegCZNMxzo3aIjnHKtVBRWRFW+sk2xKXpUgoydgraDxUBgBAJW8CjZeXxkMJ+sYQL22MtUaBfFoEgZsh8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XTbag7YB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XTbag7YB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CE636C433C7; Thu, 18 Jan 2024 07:58:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705564696; bh=mbeOO3/wQG7zrKVPovwISN/Vz9cG62FT4cGebtEkkis=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XTbag7YBqGjCwTW+176Jq0TjK2obwi+nI5fQdEK4uTeXw/EBow9TOHTV328C6pw7t NRKY7iM9ZWOOJyLAXbWW0IAvW6TIr7NBNQb8i4cc0oyy7WnfeY+RxhcAheZGGC0hpJ iZJOPB6z4FB/Eu5268MRDhy2vbSWuvNfgmHKFbQAGc/E6yMabr+aPlYr8oOFNuD8qb ZLs3bpPvyNM/kI2+lPLJXYy7zuhkH3UUM9xZpGv6lh82w82P8QdwSp7SFCpkLC0DPs ocbK4QBlXC84NNO2aw4dY56XYSCGp+dlTH6Ag2G9IMnzjdSSloJiGO08WktGxtp1MB Hrzw5bvMFa76Q== From: "Jiri Slaby (SUSE)" To: gregkh@linuxfoundation.org Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, "Jiri Slaby (SUSE)" , Helge Deller , Daniel Vetter , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH 07/45] tty: vt: pass vc_resize_user as a parameter Date: Thu, 18 Jan 2024 08:57:18 +0100 Message-ID: <20240118075756.10541-8-jirislaby@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240118075756.10541-1-jirislaby@kernel.org> References: <20240118075756.10541-1-jirislaby@kernel.org> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 It is pretty unfortunate to set vc_data::vc_resize_user in two callers of vc_do_resize(). vc_resize_user is immediately reset there (while remembering it). So instead of this back and forth, pass 'from_user' as a parameter. Notes on 'int user': * The name changes from 'user' to 'from_user' on some places to be consistent. * The type is bool now as 'int user' might evoke user's uid or whatever. Provided vc_resize() is called on many places and they need not to care about this parameter, its prototype is kept unchanged. Instead, it is now an inline calling a new __vc_resize() which implements the above. This patch makes the situation much more obvious. Signed-off-by: Jiri Slaby (SUSE) Cc: Helge Deller Cc: Daniel Vetter Cc: linux-fbdev@vger.kernel.org Cc: dri-devel@lists.freedesktop.org --- drivers/tty/vt/vt.c | 28 +++++++++++++--------------- drivers/tty/vt/vt_ioctl.c | 6 ++---- drivers/video/console/vgacon.c | 4 ++-- drivers/video/fbdev/core/fbcon.c | 2 +- include/linux/console.h | 2 +- include/linux/console_struct.h | 1 - include/linux/vt_kern.h | 9 ++++++++- 7 files changed, 27 insertions(+), 25 deletions(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 3a6f60ad2224..c87837306074 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1115,13 +1115,13 @@ int vc_allocate(unsigned int currcons) /* return 0 on success */ } static inline int resize_screen(struct vc_data *vc, int width, int height, - int user) + bool from_user) { /* Resizes the resolution of the display adapater */ int err = 0; if (vc->vc_sw->con_resize) - err = vc->vc_sw->con_resize(vc, width, height, user); + err = vc->vc_sw->con_resize(vc, width, height, from_user); return err; } @@ -1132,6 +1132,7 @@ static inline int resize_screen(struct vc_data *vc, int width, int height, * @vc: virtual console private data * @cols: columns * @lines: lines + * @from_user: invoked by a user? * * Resize a virtual console, clipping according to the actual constraints. * If the caller passes a tty structure then update the termios winsize @@ -1142,21 +1143,17 @@ static inline int resize_screen(struct vc_data *vc, int width, int height, */ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc, - unsigned int cols, unsigned int lines) + unsigned int cols, unsigned int lines, bool from_user) { unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0; unsigned long end; unsigned int old_rows, old_row_size, first_copied_row; unsigned int new_cols, new_rows, new_row_size, new_screen_size; - unsigned int user; unsigned short *oldscreen, *newscreen; u32 **new_uniscr = NULL; WARN_CONSOLE_UNLOCKED(); - user = vc->vc_resize_user; - vc->vc_resize_user = 0; - if (cols > VC_MAXCOL || lines > VC_MAXROW) return -EINVAL; @@ -1182,7 +1179,7 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc, * to deal with possible errors from the code below, we call * the resize_screen here as well. */ - return resize_screen(vc, new_cols, new_rows, user); + return resize_screen(vc, new_cols, new_rows, from_user); } if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size) @@ -1205,7 +1202,7 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc, old_rows = vc->vc_rows; old_row_size = vc->vc_size_row; - err = resize_screen(vc, new_cols, new_rows, user); + err = resize_screen(vc, new_cols, new_rows, from_user); if (err) { kfree(newscreen); vc_uniscr_free(new_uniscr); @@ -1292,22 +1289,23 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc, } /** - * vc_resize - resize a VT + * __vc_resize - resize a VT * @vc: virtual console * @cols: columns * @rows: rows + * @from_user: invoked by a user? * * Resize a virtual console as seen from the console end of things. We * use the common vc_do_resize methods to update the structures. The * caller must hold the console sem to protect console internals and * vc->port.tty */ - -int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows) +int __vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows, + bool from_user) { - return vc_do_resize(vc->port.tty, vc, cols, rows); + return vc_do_resize(vc->port.tty, vc, cols, rows, from_user); } -EXPORT_SYMBOL(vc_resize); +EXPORT_SYMBOL(__vc_resize); /** * vt_resize - resize a VT @@ -1327,7 +1325,7 @@ static int vt_resize(struct tty_struct *tty, struct winsize *ws) int ret; console_lock(); - ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row); + ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row, false); console_unlock(); return ret; } diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c index 8c685b501404..4b91072f3a4e 100644 --- a/drivers/tty/vt/vt_ioctl.c +++ b/drivers/tty/vt/vt_ioctl.c @@ -714,8 +714,7 @@ static int vt_resizex(struct vc_data *vc, struct vt_consize __user *cs) vcp->vc_scan_lines = v.v_vlin; if (v.v_clin) vcp->vc_cell_height = v.v_clin; - vcp->vc_resize_user = 1; - ret = vc_resize(vcp, v.v_cols, v.v_rows); + ret = __vc_resize(vcp, v.v_cols, v.v_rows, true); if (ret) { vcp->vc_scan_lines = save_scan_lines; vcp->vc_cell_height = save_cell_height; @@ -923,9 +922,8 @@ int vt_ioctl(struct tty_struct *tty, vc = vc_cons[i].d; if (vc) { - vc->vc_resize_user = 1; /* FIXME: review v tty lock */ - vc_resize(vc_cons[i].d, cc, ll); + __vc_resize(vc_cons[i].d, cc, ll, true); } } console_unlock(); diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 9176fff9ce6e..0c76e2817b49 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -1081,12 +1081,12 @@ static int vgacon_font_get(struct vc_data *c, struct console_font *font, unsigne } static int vgacon_resize(struct vc_data *c, unsigned int width, - unsigned int height, unsigned int user) + unsigned int height, bool from_user) { if ((width << 1) * height > vga_vram_size) return -EINVAL; - if (user) { + if (from_user) { /* * Ho ho! Someone (svgatextmode, eh?) may have reprogrammed * the video mode! Set the new defaults then and go away. diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index a8c32cb4c878..dd2f4617485c 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -1996,7 +1996,7 @@ static void updatescrollmode(struct fbcon_display *p, #define CALC_FONTSZ(h, p, c) ((h) * (p) * (c)) /* size = height * pitch * charcount */ static int fbcon_resize(struct vc_data *vc, unsigned int width, - unsigned int height, unsigned int user) + unsigned int height, bool from_user) { struct fb_info *info = fbcon_info_from_console(vc->vc_num); struct fbcon_ops *ops = info->fbcon_par; diff --git a/include/linux/console.h b/include/linux/console.h index 779d388af8a0..38b379d6c624 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -66,7 +66,7 @@ struct consw { int (*con_font_default)(struct vc_data *vc, struct console_font *font, char *name); int (*con_resize)(struct vc_data *vc, unsigned int width, - unsigned int height, unsigned int user); + unsigned int height, bool from_user); void (*con_set_palette)(struct vc_data *vc, const unsigned char *table); void (*con_scrolldelta)(struct vc_data *vc, int lines); diff --git a/include/linux/console_struct.h b/include/linux/console_struct.h index 539f1cd45309..20f564e98552 100644 --- a/include/linux/console_struct.h +++ b/include/linux/console_struct.h @@ -151,7 +151,6 @@ struct vc_data { DECLARE_BITMAP(vc_tab_stop, VC_TABSTOPS_COUNT); /* Tab stops. 256 columns. */ unsigned char vc_palette[16*3]; /* Colour palette for VGA+ */ unsigned short * vc_translate; - unsigned int vc_resize_user; /* resize request from user */ unsigned int vc_bell_pitch; /* Console bell pitch */ unsigned int vc_bell_duration; /* Console bell duration */ unsigned short vc_cur_blink_ms; /* Cursor blink duration */ diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h index a789ea3ed2a0..d008c3d0a9bb 100644 --- a/include/linux/vt_kern.h +++ b/include/linux/vt_kern.h @@ -25,7 +25,8 @@ extern int fg_console, last_console, want_console; int vc_allocate(unsigned int console); int vc_cons_allocated(unsigned int console); -int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines); +int __vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines, + bool from_user); struct vc_data *vc_deallocate(unsigned int console); void reset_palette(struct vc_data *vc); void do_blank_screen(int entering_gfx); @@ -42,6 +43,12 @@ void redraw_screen(struct vc_data *vc, int is_switch); #define update_screen(x) redraw_screen(x, 0) #define switch_screen(x) redraw_screen(x, 1) +static inline int vc_resize(struct vc_data *vc, unsigned int cols, + unsigned int lines) +{ + return __vc_resize(vc, cols, lines, false); +} + struct tty_struct; int tioclinux(struct tty_struct *tty, unsigned long arg);