diff options
Diffstat (limited to 'drivers/media/dvb-frontends/zl10039.c')
| -rw-r--r-- | drivers/media/dvb-frontends/zl10039.c | 49 |
1 files changed, 23 insertions, 26 deletions
diff --git a/drivers/media/dvb-frontends/zl10039.c b/drivers/media/dvb-frontends/zl10039.c index eff9c5fde50a..a3e4d219400c 100644 --- a/drivers/media/dvb-frontends/zl10039.c +++ b/drivers/media/dvb-frontends/zl10039.c @@ -1,22 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for Zarlink ZL10039 DVB-S tuner * * Copyright 2007 Jan D. Louw <jd.louw@mweb.co.za> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/module.h> @@ -25,11 +11,14 @@ #include <linux/slab.h> #include <linux/dvb/frontend.h> -#include "dvb_frontend.h" +#include <media/dvb_frontend.h> #include "zl10039.h" static int debug; +/* Max transfer size done by I2C transfer functions */ +#define MAX_XFER_SIZE 64 + #define dprintk(args...) \ do { \ if (debug) \ @@ -98,7 +87,7 @@ static int zl10039_write(struct zl10039_state *state, const enum zl10039_reg_addr reg, const u8 *src, const size_t count) { - u8 buf[count + 1]; + u8 buf[MAX_XFER_SIZE]; struct i2c_msg msg = { .addr = state->i2c_addr, .flags = 0, @@ -106,6 +95,13 @@ static int zl10039_write(struct zl10039_state *state, .len = count + 1, }; + if (1 + count > sizeof(buf)) { + printk(KERN_WARNING + "%s: i2c wr reg=%04x: len=%zu is too big!\n", + KBUILD_MODNAME, reg, count); + return -EINVAL; + } + dprintk("%s\n", __func__); /* Write register address and data in one go */ buf[0] = reg; @@ -128,7 +124,9 @@ static inline int zl10039_writereg(struct zl10039_state *state, const enum zl10039_reg_addr reg, const u8 val) { - return zl10039_write(state, reg, &val, 1); + const u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */ + + return zl10039_write(state, reg, &tmp, 1); } static int zl10039_init(struct dvb_frontend *fe) @@ -142,8 +140,7 @@ static int zl10039_init(struct dvb_frontend *fe) /* Reset logic */ ret = zl10039_writereg(state, GENERAL, 0x40); if (ret < 0) { - dprintk("Note: i2c write error normal when resetting the " - "tuner\n"); + dprintk("Note: i2c write error normal when resetting the tuner\n"); } /* Wake up */ ret = zl10039_writereg(state, GENERAL, 0x01); @@ -235,17 +232,16 @@ error: return ret; } -static int zl10039_release(struct dvb_frontend *fe) +static void zl10039_release(struct dvb_frontend *fe) { struct zl10039_state *state = fe->tuner_priv; dprintk("%s\n", __func__); kfree(state); fe->tuner_priv = NULL; - return 0; } -static struct dvb_tuner_ops zl10039_ops = { +static const struct dvb_tuner_ops zl10039_ops = { .release = zl10039_release, .init = zl10039_init, .sleep = zl10039_sleep, @@ -282,8 +278,9 @@ struct dvb_frontend *zl10039_attach(struct dvb_frontend *fe, state->id = state->id & 0x0f; switch (state->id) { case ID_ZL10039: - strcpy(fe->ops.tuner_ops.info.name, - "Zarlink ZL10039 DVB-S tuner"); + strscpy(fe->ops.tuner_ops.info.name, + "Zarlink ZL10039 DVB-S tuner", + sizeof(fe->ops.tuner_ops.info.name)); break; default: dprintk("Chip ID=%x does not match a known type\n", state->id); @@ -298,7 +295,7 @@ error: kfree(state); return NULL; } -EXPORT_SYMBOL(zl10039_attach); +EXPORT_SYMBOL_GPL(zl10039_attach); module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); |