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[PATCH 26/36] usb: serial: ti_usb_3410_5052: Fix firmware downloading

From Mathieu OTHACEHE <m.othacehe@gmail.com>
Newsgroups linux.kernel
Subject [PATCH 26/36] usb: serial: ti_usb_3410_5052: Fix firmware downloading
Date 2016-05-12 11:00 +0200
Message-ID <rxUDp-21y-19@gated-at.bofh.it> (permalink)
References <rxUDo-21y-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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The buffer used to store firmware is allocated to maximum firmware
size (TI_FIRMWARE_BUF_SIZE) + header size.
This buffer is filled with requested firmware (fw_p->size) and padded
with 0xff bytes. The header is written over the 3 first bytes of the
buffer (overwritting the 3 first bytes of the requested firmware)

Then, ti_do_download function is called to send only the first
fw_p->size bytes from the buffer to the device.
The rest of the buffer is never used.

So it is sufficient to allocate a buffer of fw_p->size bytes to store
only the requested firmware. There is no need to do any padding.

This patch also move firmware buffer manipulation to ti_do_download
function.

Signed-off-by: Mathieu OTHACEHE <m.othacehe@gmail.com>
---
 drivers/usb/serial/ti_usb_3410_5052.c | 62 +++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 29 deletions(-)

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index b50f52f..85f66f0 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -1259,47 +1259,65 @@ static void ti_handle_new_msr(struct usb_serial_port *port, u8 msr)
 	tport->tp_msr = msr & TI_MSR_MASK;
 }
 
-static int ti_do_download(struct usb_device *dev, int pipe,
-						u8 *buffer, int size)
+static int ti_do_download(struct usb_serial *serial,
+			  const struct firmware *fw_p)
 {
 	int pos;
 	u8 cs = 0;
 	int done;
+	struct usb_device *dev = serial->dev;
 	struct ti_firmware_header *header;
 	int status = 0;
+	u8 *buffer;
+	int buffer_size;
 	int len;
+	unsigned int pipe;
+
+	pipe = usb_sndbulkpipe(dev, serial->port[0]->bulk_out_endpointAddress);
+
+	buffer_size = fw_p->size;
+	buffer = kmalloc(buffer_size, GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
 
-	for (pos = sizeof(struct ti_firmware_header); pos < size; pos++)
+	memcpy(buffer, fw_p->data, fw_p->size);
+
+	for (pos = sizeof(*header); pos < buffer_size; pos++)
 		cs = (u8)(cs + buffer[pos]);
 
 	header = (struct ti_firmware_header *)buffer;
-	header->wLength = cpu_to_le16((u16)(size
-					- sizeof(struct ti_firmware_header)));
+	header->wLength = cpu_to_le16(buffer_size - sizeof(*header));
 	header->bCheckSum = cs;
 
 	dev_dbg(&dev->dev, "%s - downloading firmware\n", __func__);
-	for (pos = 0; pos < size; pos += done) {
-		len = min(size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
+	for (pos = 0; pos < buffer_size; pos += done) {
+		len = min(buffer_size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
 		status = usb_bulk_msg(dev, pipe, buffer + pos, len, &done,
 				      TI_DOWNLOAD_TIMEOUT);
 		if (status)
 			break;
 	}
-	return status;
+
+	kfree(buffer);
+
+	if (status) {
+		dev_err(&dev->dev, "failed to download firmware: %d\n", status);
+		return status;
+	}
+
+	dev_dbg(&dev->dev, "%s - download successful\n", __func__);
+
+	return 0;
 }
 
 static int ti_download_firmware(struct usb_serial *serial)
 {
 	int status;
-	int buffer_size;
-	u8 *buffer;
 	struct usb_device *dev = serial->dev;
 	struct ti_device *tdev = usb_get_serial_data(serial);
-	unsigned int pipe;
 	const struct firmware *fw_p;
 	char buf[32];
 
-	pipe = usb_sndbulkpipe(dev, serial->port[0]->bulk_out_endpointAddress);
 
 	if (le16_to_cpu(dev->descriptor.idVendor) == MXU1_VENDOR_ID) {
 		snprintf(buf,
@@ -1354,30 +1372,16 @@ check_firmware:
 		dev_err(&dev->dev, "%s - firmware not found\n", __func__);
 		return -ENOENT;
 	}
+
 	if (fw_p->size > TI_FIRMWARE_BUF_SIZE) {
 		dev_err(&dev->dev, "%s - firmware too large %zu\n", __func__, fw_p->size);
 		release_firmware(fw_p);
 		return -ENOENT;
 	}
 
-	buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
-	buffer = kmalloc(buffer_size, GFP_KERNEL);
-	if (buffer) {
-		memcpy(buffer, fw_p->data, fw_p->size);
-		memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
-		status = ti_do_download(dev, pipe, buffer, fw_p->size);
-		kfree(buffer);
-	} else {
-		status = -ENOMEM;
-	}
-	release_firmware(fw_p);
-	if (status) {
-		dev_err(&dev->dev, "%s - error downloading firmware, %d\n",
-							__func__, status);
-		return status;
-	}
+	ti_do_download(serial, fw_p);
 
-	dev_dbg(&dev->dev, "%s - download successful\n", __func__);
+	release_firmware(fw_p);
 
 	return 0;
 }
-- 
2.8.2

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Thread

[PATCH 00/36] usb: serial: ti_usb_3410_5052: clean driver Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 29/36] usb: serial: ti_usb_3410_5052: Set shadow msr before waking up waiters Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 17/36] usb: serial: ti_usb_3410_5052: Remove useless tty_wakeup Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 19/36] usb: serial: ti_usb_3410_5052: Do not modify interrupt context Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 15/36] usb: serial: ti_usb_3410_5052: Remove in_sync and out_sync functions Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 01/36] usb: serial: ti_usb_3410_5052: Remove useless comments Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 27/36] usb: serial: ti_usb_3410_5052: Standardize debug and error messages Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 26/36] usb: serial: ti_usb_3410_5052: Fix firmware downloading Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 24/36] usb: serial: ti_usb_3410_5052: Use usb_serial_generic_open Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 30/36] usb: serial: ti_usb_3410_5052: Remove backpointer in ti_port Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 31/36] usb: serial: ti_usb_3410_5052: Use a mutex to protect shadow mcr Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 23/36] usb: serial: ti_usb_3410_5052: Do not set shadow mcr in open callback Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 32/36] usb: serial: ti_usb_3410_5052: Remove prefixes from private structures Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 10/36] usb: serial: ti_usb_3410_5052: Remove useless NULL-testing Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 36/36] usb: serial: ti_usb_3410_5052: Add myself as an author Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 35/36] usb: serial: ti_usb_3410_5052: Remove function prototypes Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 22/36] usb: serial: ti_usb_3410_5052: Change ti_get/set_serial_info function arguments Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 33/36] usb: serial: ti_usb_3410_5052: Add CMSPAR support Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 25/36] usb: serial: ti_usb_3410_5052: Check old_termios parameter in set_termios Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 34/36] usb: serial: ti_usb_3410_5052: Fix indentation problems Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:00 +0200
  [PATCH 06/36] usb: serial: ti_usb_3410_5052: Do not use __uX types Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 12/36] usb: serial: ti_usb_3410_5052: Use generic read/write callbacks Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 02/36] usb: serial: ti_usb_3410_5052: use __packed instead of __attribute__((packed)) Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 05/36] usb: serial: ti_usb_3410_5052: Remove unused data structures Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 08/36] usb: serial: ti_usb_3410_5052: Remove useless dev_dbg messages Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 16/36] usb: serial: ti_usb_3410_5052: Use bulk_out_size in TIOCGSERIAL Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 14/36] usb: serial: ti_usb_3410_5052: Use macros instead of magic values Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 07/36] usb: serial: ti_usb_3410_5052: Remove closing_wait module parameter Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 20/36] usb: serial: ti_usb_3410_5052: Remove usb_serial pointer in ti_port Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 04/36] usb: serial: ti_usb_3410_5052: Use inline functions rather than macro Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
    Re: [PATCH 04/36] usb: serial: ti_usb_3410_5052: Use inline functions  rather than macro Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> - 2016-05-12 14:10 +0200
  [PATCH 13/36] usb: serial: ti_usb_3410_5052: Remove unused variables Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 18/36] usb: serial: ti_usb_3410_5052: Change ti_write_byte function arguments Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 11/36] usb: serial: ti_usb_3410_5052: Use C_X macros instead of c_cflag manipulation Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200
  [PATCH 03/36] usb: serial: ti_usb_3410_5052: Remove ti_usb_3410_5052.h Mathieu OTHACEHE <m.othacehe@gmail.com> - 2016-05-12 11:10 +0200

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