Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753367AbcJKKMi (ORCPT ); Tue, 11 Oct 2016 06:12:38 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:56860 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752911AbcJKKLj (ORCPT ); Tue, 11 Oct 2016 06:11:39 -0400 From: Mauro Carvalho Chehab To: Linux Media Mailing List Cc: Mauro Carvalho Chehab , Mauro Carvalho Chehab , Andy Lutomirski , Johannes Stezenbach , Jiri Kosina , Patrick Boettcher , Linux Kernel Mailing List , Andy Lutomirski , Michael Krufky , Mauro Carvalho Chehab , =?UTF-8?q?J=C3=B6rg=20Otte?= , Olli Salonen Subject: [PATCH v2 21/31] pctv452e: don't do DMA on stack Date: Tue, 11 Oct 2016 07:09:36 -0300 Message-Id: <3d1b8538200afb6823b82c2720d038d229c60b7a.1476179975.git.mchehab@s-opensource.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7602 Lines: 274 The USB control messages require DMA to work. We cannot pass a stack-allocated buffer, as it is not warranted that the stack would be into a DMA enabled area. Reviewed-By: Patrick Boettcher Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/dvb-usb/pctv452e.c | 129 ++++++++++++++++++++--------------- 1 file changed, 74 insertions(+), 55 deletions(-) diff --git a/drivers/media/usb/dvb-usb/pctv452e.c b/drivers/media/usb/dvb-usb/pctv452e.c index c05de1b088a4..58b685094904 100644 --- a/drivers/media/usb/dvb-usb/pctv452e.c +++ b/drivers/media/usb/dvb-usb/pctv452e.c @@ -97,13 +97,14 @@ struct pctv452e_state { u8 c; /* transaction counter, wraps around... */ u8 initialized; /* set to 1 if 0x15 has been sent */ u16 last_rc_key; + + unsigned char data[80]; }; static int tt3650_ci_msg(struct dvb_usb_device *d, u8 cmd, u8 *data, unsigned int write_len, unsigned int read_len) { struct pctv452e_state *state = (struct pctv452e_state *)d->priv; - u8 buf[64]; u8 id; unsigned int rlen; int ret; @@ -112,33 +113,36 @@ static int tt3650_ci_msg(struct dvb_usb_device *d, u8 cmd, u8 *data, BUG_ON(write_len > 64 - 4); BUG_ON(read_len > 64 - 4); + mutex_lock(&state->ca_mutex); id = state->c++; - buf[0] = SYNC_BYTE_OUT; - buf[1] = id; - buf[2] = cmd; - buf[3] = write_len; + state->data[0] = SYNC_BYTE_OUT; + state->data[1] = id; + state->data[2] = cmd; + state->data[3] = write_len; - memcpy(buf + 4, data, write_len); + memcpy(state->data + 4, data, write_len); rlen = (read_len > 0) ? 64 : 0; - ret = dvb_usb_generic_rw(d, buf, 4 + write_len, - buf, rlen, /* delay_ms */ 0); + ret = dvb_usb_generic_rw(d, state->data, 4 + write_len, + state->data, rlen, /* delay_ms */ 0); if (0 != ret) goto failed; ret = -EIO; - if (SYNC_BYTE_IN != buf[0] || id != buf[1]) + if (SYNC_BYTE_IN != state->data[0] || id != state->data[1]) goto failed; - memcpy(data, buf + 4, read_len); + memcpy(data, state->data + 4, read_len); + mutex_unlock(&state->ca_mutex); return 0; failed: err("CI error %d; %02X %02X %02X -> %*ph.", - ret, SYNC_BYTE_OUT, id, cmd, 3, buf); + ret, SYNC_BYTE_OUT, id, cmd, 3, state->data); + mutex_unlock(&state->ca_mutex); return ret; } @@ -405,52 +409,53 @@ static int pctv452e_i2c_msg(struct dvb_usb_device *d, u8 addr, u8 *rcv_buf, u8 rcv_len) { struct pctv452e_state *state = (struct pctv452e_state *)d->priv; - u8 buf[64]; u8 id; int ret; + mutex_lock(&state->ca_mutex); id = state->c++; ret = -EINVAL; if (snd_len > 64 - 7 || rcv_len > 64 - 7) goto failed; - buf[0] = SYNC_BYTE_OUT; - buf[1] = id; - buf[2] = PCTV_CMD_I2C; - buf[3] = snd_len + 3; - buf[4] = addr << 1; - buf[5] = snd_len; - buf[6] = rcv_len; + state->data[0] = SYNC_BYTE_OUT; + state->data[1] = id; + state->data[2] = PCTV_CMD_I2C; + state->data[3] = snd_len + 3; + state->data[4] = addr << 1; + state->data[5] = snd_len; + state->data[6] = rcv_len; - memcpy(buf + 7, snd_buf, snd_len); + memcpy(state->data + 7, snd_buf, snd_len); - ret = dvb_usb_generic_rw(d, buf, 7 + snd_len, - buf, /* rcv_len */ 64, + ret = dvb_usb_generic_rw(d, state->data, 7 + snd_len, + state->data, /* rcv_len */ 64, /* delay_ms */ 0); if (ret < 0) goto failed; /* TT USB protocol error. */ ret = -EIO; - if (SYNC_BYTE_IN != buf[0] || id != buf[1]) + if (SYNC_BYTE_IN != state->data[0] || id != state->data[1]) goto failed; /* I2C device didn't respond as expected. */ ret = -EREMOTEIO; - if (buf[5] < snd_len || buf[6] < rcv_len) + if (state->data[5] < snd_len || state->data[6] < rcv_len) goto failed; - memcpy(rcv_buf, buf + 7, rcv_len); + memcpy(rcv_buf, state->data + 7, rcv_len); + mutex_unlock(&state->ca_mutex); return rcv_len; failed: - err("I2C error %d; %02X %02X %02X %02X %02X -> " - "%02X %02X %02X %02X %02X.", + err("I2C error %d; %02X %02X %02X %02X %02X -> %*ph", ret, SYNC_BYTE_OUT, id, addr << 1, snd_len, rcv_len, - buf[0], buf[1], buf[4], buf[5], buf[6]); + 7, state->data); + mutex_unlock(&state->ca_mutex); return ret; } @@ -499,8 +504,7 @@ static u32 pctv452e_i2c_func(struct i2c_adapter *adapter) static int pctv452e_power_ctrl(struct dvb_usb_device *d, int i) { struct pctv452e_state *state = (struct pctv452e_state *)d->priv; - u8 b0[] = { 0xaa, 0, PCTV_CMD_RESET, 1, 0 }; - u8 rx[PCTV_ANSWER_LEN]; + u8 *rx; int ret; info("%s: %d\n", __func__, i); @@ -511,6 +515,11 @@ static int pctv452e_power_ctrl(struct dvb_usb_device *d, int i) if (state->initialized) return 0; + rx = kmalloc(PCTV_ANSWER_LEN, GFP_KERNEL); + if (!rx) + return -ENOMEM; + + mutex_lock(&state->ca_mutex); /* hmm where shoud this should go? */ ret = usb_set_interface(d->udev, 0, ISOC_INTERFACE_ALTERNATIVE); if (ret != 0) @@ -518,65 +527,75 @@ static int pctv452e_power_ctrl(struct dvb_usb_device *d, int i) __func__, ret); /* this is a one-time initialization, dont know where to put */ - b0[1] = state->c++; + state->data[0] = 0xaa; + state->data[1] = state->c++; + state->data[2] = PCTV_CMD_RESET; + state->data[3] = 1; + state->data[4] = 0; /* reset board */ - ret = dvb_usb_generic_rw(d, b0, sizeof(b0), rx, PCTV_ANSWER_LEN, 0); + ret = dvb_usb_generic_rw(d, state->data, 5, rx, PCTV_ANSWER_LEN, 0); if (ret) - return ret; + goto ret; - b0[1] = state->c++; - b0[4] = 1; + state->data[1] = state->c++; + state->data[4] = 1; /* reset board (again?) */ - ret = dvb_usb_generic_rw(d, b0, sizeof(b0), rx, PCTV_ANSWER_LEN, 0); + ret = dvb_usb_generic_rw(d, state->data, 5, rx, PCTV_ANSWER_LEN, 0); if (ret) - return ret; + goto ret; state->initialized = 1; - return 0; +ret: + mutex_unlock(&state->ca_mutex); + kfree(rx); + return ret; } static int pctv452e_rc_query(struct dvb_usb_device *d) { struct pctv452e_state *state = (struct pctv452e_state *)d->priv; - u8 b[CMD_BUFFER_SIZE]; - u8 rx[PCTV_ANSWER_LEN]; int ret, i; - u8 id = state->c++; + u8 id; + + mutex_lock(&state->ca_mutex); + id = state->c++; /* prepare command header */ - b[0] = SYNC_BYTE_OUT; - b[1] = id; - b[2] = PCTV_CMD_IR; - b[3] = 0; + state->data[0] = SYNC_BYTE_OUT; + state->data[1] = id; + state->data[2] = PCTV_CMD_IR; + state->data[3] = 0; /* send ir request */ - ret = dvb_usb_generic_rw(d, b, 4, rx, PCTV_ANSWER_LEN, 0); + ret = dvb_usb_generic_rw(d, state->data, 4, + state->data, PCTV_ANSWER_LEN, 0); if (ret != 0) - return ret; + goto ret; if (debug > 3) { - info("%s: read: %2d: %*ph: ", __func__, ret, 3, rx); - for (i = 0; (i < rx[3]) && ((i+3) < PCTV_ANSWER_LEN); i++) - info(" %02x", rx[i+3]); + info("%s: read: %2d: %*ph: ", __func__, ret, 3, state->data); + for (i = 0; (i < state->data[3]) && ((i + 3) < PCTV_ANSWER_LEN); i++) + info(" %02x", state->data[i + 3]); info("\n"); } - if ((rx[3] == 9) && (rx[12] & 0x01)) { + if ((state->data[3] == 9) && (state->data[12] & 0x01)) { /* got a "press" event */ - state->last_rc_key = RC_SCANCODE_RC5(rx[7], rx[6]); + state->last_rc_key = RC_SCANCODE_RC5(state->data[7], state->data[6]); if (debug > 2) info("%s: cmd=0x%02x sys=0x%02x\n", - __func__, rx[6], rx[7]); + __func__, state->data[6], state->data[7]); rc_keydown(d->rc_dev, RC_TYPE_RC5, state->last_rc_key, 0); } else if (state->last_rc_key) { rc_keyup(d->rc_dev); state->last_rc_key = 0; } - - return 0; +ret: + mutex_unlock(&state->ca_mutex); + return ret; } static int pctv452e_read_mac_address(struct dvb_usb_device *d, u8 mac[6]) -- 2.7.4